Uses of Package
java.util

Packages that use java.util
Package
Description
Provides a collection of interfaces and classes that compose the Java Accessibility Utilities.
This is the core package of the Java Debug Interface (JDI), it defines mirrors for values, types, and the target VirtualMachine itself - as well bootstrapping facilities.
This package defines connections between the virtual machine using the JDI and the target virtual machine.
This package defines JDI events and event processing.
This package is used to request that a JDI event be sent under specified conditions.
This package contains the JDK's extension to the standard implementation of the java.lang.management API and also defines the management interface for some other components of the platform.
Provides a simple high-level Http server API, which can be used to build embedded HTTP servers.
A Java API for Stream Control Transport Protocol.
Provides implementations of LoginModule.
Provides interfaces to represent documentation comments as abstract syntax trees (AST).
Provides interfaces to represent source code as abstract syntax trees (AST).
Provides utilities for operations on abstract syntax trees (AST).
Provides the API to attach to a Java virtual machine.
Only developers who are defining new attach providers should need to make direct use of this package.
This package contains the JConsole API.
Provides the classes necessary to create an applet and the classes an applet uses to communicate with its applet context.
Contains all of the classes for creating user interfaces and for painting graphics and images.
Provides interfaces and classes for transferring data between and within applications.
Provides interfaces and classes for interaction with various desktop capabilities.
Drag and Drop is a direct manipulation gesture found in many Graphical User Interface systems that provides a mechanism to transfer information between two entities logically associated with presentation elements in the GUI.
Provides interfaces and classes for dealing with different types of events fired by AWT components.
Provides classes and interface relating to fonts.
Provides classes and interfaces for the input method framework.
Provides interfaces that enable the development of input methods that can be used with any Java runtime environment.
Provides classes for creating and modifying images.
Provides classes and interfaces for producing rendering-independent images.
Contains classes related to developing beans -- components based on the JavaBeans architecture.
Provides classes and interfaces relating to bean context.
Provides for system input and output through data streams, serialization and the file system.
Provides classes that are fundamental to the design of the Java programming language.
Classes and interfaces to represent nominal descriptors for run-time entities such as classes or method handles, and classfile entities such as constant pool entries or invokedynamic call sites.
Provides services that allow Java programming language agents to instrument programs running on the JVM.
The java.lang.invoke package provides low-level primitives for interacting with the Java Virtual Machine.
Provides the management interfaces for monitoring and management of the Java virtual machine and other components in the Java runtime.
Classes to support module descriptors and creating configurations of modules by means of resolution and service binding.
Provides classes for performing arbitrary-precision integer arithmetic (BigInteger) and arbitrary-precision decimal arithmetic (BigDecimal).
Provides the classes for implementing networking applications.
HTTP Client and WebSocket APIs
Defines channels, which represent connections to entities that are capable of performing I/O operations, such as files and sockets; defines selectors, for multiplexed, non-blocking I/O operations.
Service-provider classes for the java.nio.channels package.
Defines charsets, decoders, and encoders, for translating between bytes and Unicode characters.
Service-provider classes for the java.nio.charset package.
Defines interfaces and classes for the Java virtual machine to access files, file attributes, and file systems.
Interfaces and classes providing access to file and file system attributes.
Service-provider classes for the java.nio.file package.
Provides the classes and interfaces for the security framework.
Provides classes and interfaces for parsing and managing certificates, certificate revocation lists (CRLs), and certification paths.
Provides interfaces for generating RSA (Rivest, Shamir and Adleman AsymmetricCipher algorithm) keys as defined in the RSA Laboratory Technical Note PKCS#1, and DSA (Digital Signature Algorithm) keys as defined in NIST's FIPS-186.
Provides classes and interfaces for key specifications and algorithm parameter specifications.
Provides the API for accessing and processing data stored in a data source (usually a relational database) using the Java programming language.
Provides classes and interfaces for handling text, dates, numbers, and messages in a manner independent of natural languages.
Service provider classes for the classes in the java.text package.
The main API for dates, times, instants, and durations.
Generic API for calendar systems other than the default ISO.
Provides classes to print and parse dates and times.
Access to date and time using fields and units, and date time adjusters.
Support for time-zones and their rules.
Contains the collections framework, some internationalization support classes, a service loader, properties, random number generation, string parsing and scanning classes, base64 encoding and decoding, a bit array, and several miscellaneous utility classes.
Utility classes commonly useful in concurrent programming.
Interfaces and classes providing a framework for locking and waiting for conditions that is distinct from built-in synchronization and monitors.
Functional interfaces provide target types for lambda expressions and method references.
Provides classes for reading and writing the JAR (Java ARchive) file format, which is based on the standard ZIP file format with an optional manifest file.
Provides the classes and interfaces of the Java 2 platform's core logging facilities.
This package allows applications to store and retrieve user and system preference and configuration data.
Service provider classes for the classes in the java.util package.
Classes to support functional-style operations on streams of elements, such as map-reduce transformations on collections.
Provides classes for reading and writing the standard ZIP and GZIP file formats.
Defines a contract between user-interface components and an assistive technology that provides access to those components.
Facilities for declaring annotation processors and for allowing annotation processors to communicate with an annotation processing tool environment.
The main package of the Java Image I/O API.
A package of the Java Image I/O API dealing with synchronous notification of events during the reading and writing of images.
A package of the Java Image I/O API dealing with reading and writing metadata.
Package containing the public classes used by the built-in BMP plug-in.
Classes supporting the built-in JPEG plug-in.
Public classes used by the built-in TIFF plug-ins.
A package of the Java Image I/O API containing the plug-in interfaces for readers, writers, transcoders, and streams, and a runtime registry.
Types and hierarchies of packages comprising a Java language model, a model of the declarations and types of the Java programming language.
Interfaces used to model elements of the Java programming language.
Interfaces used to model Java programming language types.
Utilities to assist in the processing of program elements and types.
Provides the core classes for the Java Management Extensions.
Provides the classes which implement advanced dynamic loading.
Provides the definition of the monitor classes.
Provides the open data types and Open MBean descriptor classes.
Provides the definition of the Relation Service.
Interfaces for remote access to JMX MBean servers.
The RMI connector is a connector for the JMX Remote API that uses RMI to transmit client requests to a remote MBean server.
Provides the definition of the Timer MBean.
Provides the classes and interfaces for accessing naming services.
Extends the javax.naming package to provide functionality for accessing directory services.
Provides support for event notification when accessing naming and directory services.
Provides support for LDAPv3 extended operations and controls.
 
Provides the means for dynamically plugging in support for accessing naming and directory services through the javax.naming and related packages.
Provides classes for the secure socket package.
Provides classes and interfaces that describe the types of Java Print Service attributes and how they can be collected into attribute sets.
Package javax.print.attribute.standard contains classes for specific printing attributes.
Package javax.print.event contains event classes and listener interfaces.
The scripting API consists of interfaces and classes that define Java Scripting Engines and provides a framework for their use in Java applications.
This package provides a framework for authentication and authorization.
This package provides the classes necessary for services to interact with applications in order to retrieve information (authentication data including usernames or passwords, for example) or to display information (error and warning messages, for example).
This package contains utility classes related to the Kerberos network authentication protocol.
This package provides a pluggable authentication framework.
This package provides the interface to be used for implementing pluggable authentication modules.
This package contains the classes that should be used to store X500 Principal and X500 Private Credentials in a Subject.
Provides classes for public key certificates.
Contains class and interfaces for supporting SASL.
Java™ Smart Card I/O API.
Provides interfaces and classes for I/O, sequencing, and synthesis of MIDI (Musical Instrument Digital Interface) data.
Provides interfaces and classes for capture, processing, and playback of sampled audio data.
Provides the API for server side data source access and processing from the Java programming language.
Standard interfaces and base classes for JDBC RowSet implementations.
Provides utility classes to allow serializable mappings between SQL types and data types in the Java programming language.
The standard classes and interfaces that a third party vendor has to use in its implementation of a synchronization provider.
Provides a set of "lightweight" (all-Java language) components that, to the maximum degree possible, work the same on all platforms.
Provides for events fired by Swing components.
Provides user interface objects built according to the Basic look and feel.
Provides user interface objects built according to the Java look and feel (once codenamed Metal), which is the default look and feel.
Provides user interface objects that combine two or more look and feels.
Synth is a skinnable look and feel in which all painting is delegated.
Provides classes and interfaces for dealing with javax.swing.JTable.
Provides classes and interfaces that deal with editable and noneditable text components.
Provides the class HTMLEditorKit and supporting classes for creating HTML text editors.
Provides the default HTML parser, along with support classes.
Provides classes and interfaces for dealing with javax.swing.JTree.
Allows developers to provide support for undo/redo in applications such as text editors.
Provides interfaces for tools which can be invoked from a program, for example, compilers.
Common classes for XML cryptography.
DOM-specific classes for the javax.xml.crypto package.
Classes for generating and validating XML digital signatures.
Classes for parsing and processing KeyInfo elements and structures.
Parameter classes for XML digital signatures.
Defines XML/Java Type Mappings.
Defines XML Namespace processing.
Defines interfaces and classes for the Streaming API for XML (StAX).
Defines event interfaces for the Streaming API for XML (StAX).
Provides utility classes for the Streaming API for XML (StAX).
Defines the generic APIs for processing transformation instructions, and performing a transformation from source to result.
Provides an object-model neutral API for the evaluation of XPath expressions and access to the evaluation environment.
Contains interfaces and classes that are used to link an invokedynamic call site.
Contains the linker for ordinary Java objects.
Contains interfaces and classes needed by language runtimes to implement their own language-specific object models and type conversions.
Contains classes that make it more convenient for language runtimes to implement their own language-specific object models and type conversions by providing basic implementations of some classes as well as various utilities.
Classes to support low-level and efficient foreign memory/function access, directly from Java.
The Doclet API provides an environment which, in conjunction with the Language Model API and Compiler Tree API, allows clients to inspect the source-level structures of programs and libraries, including API comments embedded in the source.
This package provides classes to create events and control Flight Recorder.
This package contains classes for consuming Flight Recorder data.
Provides interfaces for creating tools, such as a Read-Eval-Print Loop (REPL), which interactively evaluate "snippets" of Java programming language code.
Provides implementation support for building JShell execution engines.
Defines the Service Provider Interface for pluggable JShell execution engines.
Provides a mechanism to launch an instance of a Java shell tool.
This package contains classes to control and monitor Flight Recorder over Java Management Extensions (JMX).
Platform specific socket options for the java.net and java.nio.channels socket classes.
Provides the interfaces for the Simple API for XML (SAX).
Provides helper classes, including support for bootstrapping SAX-based applications.
  • Class
    Description
    A tagging interface that all event listener interfaces must extend.
    A Locale object represents a specific geographical, political, or cultural region.
  • Classes in java.util used by com.sun.jdi
    Class
    Description
    An ordered collection (also known as a sequence).
    An object that maps keys to values.
  • Classes in java.util used by com.sun.jdi.connect
    Class
    Description
    An ordered collection (also known as a sequence).
    An object that maps keys to values.
  • Classes in java.util used by com.sun.jdi.event
    Class
    Description
    The root interface in the collection hierarchy.
    An iterator over a collection.
    A collection that contains no duplicate elements.
  • Classes in java.util used by com.sun.jdi.request
    Class
    Description
    An ordered collection (also known as a sequence).
  • Classes in java.util used by com.sun.management
    Class
    Description
    The root interface in the collection hierarchy.
    An ordered collection (also known as a sequence).
    An object that maps keys to values.
  • Class
    Description
    The root interface in the collection hierarchy.
    An ordered collection (also known as a sequence).
    An object that maps keys to values.
    A map entry (key-value pair).
    A collection that contains no duplicate elements.
  • Classes in java.util used by com.sun.nio.sctp
    Class
    Description
    A collection that contains no duplicate elements.
  • Class
    Description
    An object that maps keys to values.
  • Class
    Description
    An ordered collection (also known as a sequence).
  • Classes in java.util used by com.sun.source.tree
    Class
    Description
    An ordered collection (also known as a sequence).
    A collection that contains no duplicate elements.
  • Classes in java.util used by com.sun.source.util
    Class
    Description
    An iterator over a collection.
    An ordered collection (also known as a sequence).
  • Classes in java.util used by com.sun.tools.attach
    Class
    Description
    An ordered collection (also known as a sequence).
    The Properties class represents a persistent set of properties.
  • Class
    Description
    An ordered collection (also known as a sequence).
  • Class
    Description
    An object that maps keys to values.
  • Classes in java.util used by java.applet
    Class
    Description
    An object that implements the Enumeration interface generates a series of elements, one at a time.
    An iterator over a collection.
    A Locale object represents a specific geographical, political, or cultural region.
  • Classes in java.util used by java.awt
    Class
    Description
    The root interface in the collection hierarchy.
    Thrown by methods in the Stack class to indicate that the stack is empty.
    An object that implements the Enumeration interface generates a series of elements, one at a time.
    A tagging interface that all event listener interfaces must extend.
    The root class from which all event state objects shall be derived.
    This class implements a hash table, which maps keys to values.
    An ordered collection (also known as a sequence).
    A Locale object represents a specific geographical, political, or cultural region.
    An object that maps keys to values.
    A map entry (key-value pair).
    The Properties class represents a persistent set of properties.
    Resource bundles contain locale-specific objects.
    A collection that contains no duplicate elements.
  • Classes in java.util used by java.awt.datatransfer
    Class
    Description
    A tagging interface that all event listener interfaces must extend.
    The root class from which all event state objects shall be derived.
    An ordered collection (also known as a sequence).
    An object that maps keys to values.
  • Classes in java.util used by java.awt.desktop
    Class
    Description
    A tagging interface that all event listener interfaces must extend.
    The root class from which all event state objects shall be derived.
    An ordered collection (also known as a sequence).
  • Classes in java.util used by java.awt.dnd
    Class
    Description
    Resizable-array implementation of the List interface.
    A tagging interface that all event listener interfaces must extend.
    The root class from which all event state objects shall be derived.
    An iterator over a collection.
    An ordered collection (also known as a sequence).
    The TooManyListenersException Exception is used as part of the Java Event model to annotate and implement a unicast special case of a multicast Event Source.
  • Classes in java.util used by java.awt.event
    Class
    Description
    A tagging interface that all event listener interfaces must extend.
    An abstract wrapper class for an EventListener class which associates a set of additional parameters with the listener.
    The root class from which all event state objects shall be derived.
  • Classes in java.util used by java.awt.font
    Class
    Description
    An object that maps keys to values.
    A collection that contains no duplicate elements.
  • Classes in java.util used by java.awt.im
    Class
    Description
    A Locale object represents a specific geographical, political, or cultural region.
    An object that maps keys to values.
  • Classes in java.util used by java.awt.im.spi
    Class
    Description
    A Locale object represents a specific geographical, political, or cultural region.
  • Classes in java.util used by java.awt.image
    Class
    Description
    This class implements a hash table, which maps keys to values.
    An ordered collection (also known as a sequence).
    The Vector class implements a growable array of objects.
  • Class
    Description
    The Vector class implements a growable array of objects.
  • Classes in java.util used by java.beans
    Class
    Description
    An object that implements the Enumeration interface generates a series of elements, one at a time.
    A tagging interface that all event listener interfaces must extend.
    An abstract wrapper class for an EventListener class which associates a set of additional parameters with the listener.
    The root class from which all event state objects shall be derived.
  • Class
    Description
    Resizable-array implementation of the List interface.
    The root interface in the collection hierarchy.
    A tagging interface that all event listener interfaces must extend.
    The root class from which all event state objects shall be derived.
    Hash table based implementation of the Map interface.
    An iterator over a collection.
    A Locale object represents a specific geographical, political, or cultural region.
    The TooManyListenersException Exception is used as part of the Java Event model to annotate and implement a unicast special case of a multicast Event Source.
  • Classes in java.util used by java.io
    Class
    Description
    An object that implements the Enumeration interface generates a series of elements, one at a time.
    A Locale object represents a specific geographical, political, or cultural region.
  • Classes in java.util used by java.lang
    Class
    Description
    A comparison function, which imposes a total ordering on some collection of objects.
    An object that implements the Enumeration interface generates a series of elements, one at a time.
    An iterator over a collection.
    An ordered collection (also known as a sequence).
    A Locale object represents a specific geographical, political, or cultural region.
    An object that maps keys to values.
    A container object which may or may not contain a non-null value.
    The Properties class represents a persistent set of properties.
    Resource bundles contain locale-specific objects.
    A collection that contains no duplicate elements.
    An object for traversing and partitioning elements of a source.
  • Classes in java.util used by java.lang.constant
    Class
    Description
    An ordered collection (also known as a sequence).
    A container object which may or may not contain a non-null value.
  • Classes in java.util used by java.lang.instrument
    Class
    Description
    An object that maps keys to values.
    A collection that contains no duplicate elements.
  • Classes in java.util used by java.lang.invoke
    Class
    Description
    An ordered collection (also known as a sequence).
    A container object which may or may not contain a non-null value.
  • Classes in java.util used by java.lang.management
    Class
    Description
    An ordered collection (also known as a sequence).
    An object that maps keys to values.
    A collection that contains no duplicate elements.
  • Classes in java.util used by java.lang.module
    Class
    Description
    The root interface in the collection hierarchy.
    An ordered collection (also known as a sequence).
    A container object which may or may not contain a non-null value.
    A collection that contains no duplicate elements.
  • Classes in java.util used by java.math
    Class
    Description
    An instance of this class is used to generate a stream of pseudorandom numbers; its period is only 248.
  • Classes in java.util used by java.net
    Class
    Description
    An object that implements the Enumeration interface generates a series of elements, one at a time.
    An ordered collection (also known as a sequence).
    An object that maps keys to values.
    A container object which may or may not contain a non-null value.
    A collection that contains no duplicate elements.
  • Classes in java.util used by java.net.http
    Class
    Description
    An ordered collection (also known as a sequence).
    An object that maps keys to values.
    A container object which may or may not contain a non-null value.
    A container object which may or may not contain a long value.
  • Classes in java.util used by java.nio.channels
    Class
    Description
    A collection that contains no duplicate elements.
  • Classes in java.util used by java.nio.channels.spi
    Class
    Description
    A collection that contains no duplicate elements.
  • Classes in java.util used by java.nio.charset
    Class
    Description
    A Locale object represents a specific geographical, political, or cultural region.
    A collection that contains no duplicate elements.
    A Map that further provides a total ordering on its keys.
  • Classes in java.util used by java.nio.charset.spi
    Class
    Description
    An iterator over a collection.
  • Classes in java.util used by java.nio.file
    Class
    Description
    This exception may be thrown by methods that have detected concurrent modification of an object when such modification is not permissible.
    An iterator over a collection.
    An ordered collection (also known as a sequence).
    An object that maps keys to values.
    A collection that contains no duplicate elements.
  • Class
    Description
    An ordered collection (also known as a sequence).
    A collection that contains no duplicate elements.
  • Classes in java.util used by java.nio.file.spi
    Class
    Description
    An ordered collection (also known as a sequence).
    An object that maps keys to values.
    A collection that contains no duplicate elements.
  • Classes in java.util used by java.security
    Class
    Description
    The root interface in the collection hierarchy.
    The class Date represents a specific instant in time, with millisecond precision.
    The Dictionary class is the abstract parent of any class, such as Hashtable, which maps keys to values.
    An object that implements the Enumeration interface generates a series of elements, one at a time.
    This class implements a hash table, which maps keys to values.
    An ordered collection (also known as a sequence).
    An object that maps keys to values.
    A map entry (key-value pair).
    The Properties class represents a persistent set of properties.
    An instance of this class is used to generate a stream of pseudorandom numbers; its period is only 248.
    A collection that contains no duplicate elements.
  • Classes in java.util used by java.security.cert
    Class
    Description
    The root interface in the collection hierarchy.
    The class Date represents a specific instant in time, with millisecond precision.
    An iterator over a collection.
    An ordered collection (also known as a sequence).
    An object that maps keys to values.
    A collection that contains no duplicate elements.
  • Class
    Description
    A container object which may or may not contain a non-null value.
  • Classes in java.util used by java.security.spec
    Class
    Description
    A container object which may or may not contain a non-null value.
  • Classes in java.util used by java.sql
    Class
    Description
    The Calendar class is an abstract class that provides methods for converting between a specific instant in time and a set of calendar fields such as YEAR, MONTH, DAY_OF_MONTH, HOUR, and so on, and for manipulating the calendar fields, such as getting the date of the next week.
    The class Date represents a specific instant in time, with millisecond precision.
    An object that implements the Enumeration interface generates a series of elements, one at a time.
    An iterator over a collection.
    An object that maps keys to values.
    The Properties class represents a persistent set of properties.
  • Classes in java.util used by java.text
    Class
    Description
    The Calendar class is an abstract class that provides methods for converting between a specific instant in time and a set of calendar fields such as YEAR, MONTH, DAY_OF_MONTH, HOUR, and so on, and for manipulating the calendar fields, such as getting the date of the next week.
    A comparison function, which imposes a total ordering on some collection of objects.
    Represents a currency.
    The class Date represents a specific instant in time, with millisecond precision.
    A Locale object represents a specific geographical, political, or cultural region.
    An object that maps keys to values.
    A collection that contains no duplicate elements.
    TimeZone represents a time zone offset, and also figures out daylight savings.
  • Classes in java.util used by java.text.spi
    Class
    Description
    A Locale object represents a specific geographical, political, or cultural region.
  • Classes in java.util used by java.time
    Class
    Description
    A comparison function, which imposes a total ordering on some collection of objects.
    An ordered collection (also known as a sequence).
    A Locale object represents a specific geographical, political, or cultural region.
    An object that maps keys to values.
    A collection that contains no duplicate elements.
  • Classes in java.util used by java.time.chrono
    Class
    Description
    A comparison function, which imposes a total ordering on some collection of objects.
    An ordered collection (also known as a sequence).
    A Locale object represents a specific geographical, political, or cultural region.
    An object that maps keys to values.
    A collection that contains no duplicate elements.
  • Classes in java.util used by java.time.format
    Class
    Description
    A Locale object represents a specific geographical, political, or cultural region.
    An object that maps keys to values.
    A collection that contains no duplicate elements.
  • Classes in java.util used by java.time.temporal
    Class
    Description
    An ordered collection (also known as a sequence).
    A Locale object represents a specific geographical, political, or cultural region.
    An object that maps keys to values.
  • Classes in java.util used by java.time.zone
    Class
    Description
    An ordered collection (also known as a sequence).
    A SortedMap extended with navigation methods returning the closest matches for given search targets.
    A collection that contains no duplicate elements.
  • Classes in java.util used by java.util
    Class
    Description
    This class provides a skeletal implementation of the Collection interface, to minimize the effort required to implement this interface.
    This class provides a skeletal implementation of the List interface to minimize the effort required to implement this interface backed by a "random access" data store (such as an array).
    This class provides a skeletal implementation of the Map interface, to minimize the effort required to implement this interface.
    This class provides skeletal implementations of some Queue operations.
    This class provides a skeletal implementation of the List interface to minimize the effort required to implement this interface backed by a "sequential access" data store (such as a linked list).
    This class provides a skeletal implementation of the Set interface to minimize the effort required to implement this interface.
    Resizable-array implementation of the Deque interface.
    Resizable-array implementation of the List interface.
    This class implements a decoder for decoding byte data using the Base64 encoding scheme as specified in RFC 4648 and RFC 2045.
    This class implements an encoder for encoding byte data using the Base64 encoding scheme as specified in RFC 4648 and RFC 2045.
    This class implements a vector of bits that grows as needed.
    The Calendar class is an abstract class that provides methods for converting between a specific instant in time and a set of calendar fields such as YEAR, MONTH, DAY_OF_MONTH, HOUR, and so on, and for manipulating the calendar fields, such as getting the date of the next week.
    Calendar.Builder is used for creating a Calendar from various date-time parameters.
    The root interface in the collection hierarchy.
    A comparison function, which imposes a total ordering on some collection of objects.
    Represents a currency.
    The class Date represents a specific instant in time, with millisecond precision.
    A linear collection that supports element insertion and removal at both ends.
    The Dictionary class is the abstract parent of any class, such as Hashtable, which maps keys to values.
    A state object for collecting statistics such as count, min, max, sum, and average.
    An object that implements the Enumeration interface generates a series of elements, one at a time.
    A specialized Map implementation for use with enum type keys.
    A specialized Set implementation for use with enum types.
    A tagging interface that all event listener interfaces must extend.
    An interpreter for printf-style format strings.
    Enum for BigDecimal formatting.
    GregorianCalendar is a concrete subclass of Calendar and provides the standard calendar system used by most of the world.
    Hash table based implementation of the Map interface.
    This class implements the Set interface, backed by a hash table (actually a HashMap instance).
    This class implements a hash table, which maps keys to values.
    HexFormat converts between bytes and chars and hex-encoded strings which may include additional formatting markup such as prefixes, suffixes, and delimiters.
    Unchecked exception thrown when a format string contains an illegal syntax or a format specifier that is incompatible with the given arguments.
    A state object for collecting statistics such as count, min, max, sum, and average.
    Thrown to indicate that an operation could not complete because the input did not conform to the appropriate XML document type for a collection of properties, as per the Properties specification.
    An iterator over a collection.
    An ordered collection (also known as a sequence).
    An iterator for lists that allows the programmer to traverse the list in either direction, modify the list during iteration, and obtain the iterator's current position in the list.
    A Locale object represents a specific geographical, political, or cultural region.
    Builder is used to build instances of Locale from values configured by the setters.
    Enum for locale categories.
    This enum provides constants to select a filtering mode for locale matching.
    Enum for specifying the type defined in ISO 3166.
    This class expresses a Language Range defined in RFC 4647 Matching of Language Tags.
    A state object for collecting statistics such as count, min, max, sum, and average.
    An object that maps keys to values.
    A map entry (key-value pair).
    Signals that a resource is missing.
    A SortedMap extended with navigation methods returning the closest matches for given search targets.
    A SortedSet extended with navigation methods reporting closest matches for given search targets.
    Thrown by various accessor methods to indicate that the element being requested does not exist.
    Deprecated.
    This class and the Observer interface have been deprecated.
    Deprecated.
    This interface has been deprecated.
    A container object which may or may not contain a non-null value.
    A container object which may or may not contain a double value.
    A container object which may or may not contain an int value.
    A container object which may or may not contain a long value.
    A base type for primitive specializations of Iterator.
    An Iterator specialized for double values.
    An Iterator specialized for int values.
    An Iterator specialized for long values.
    An unbounded priority queue based on a priority heap.
    The Properties class represents a persistent set of properties.
    A collection designed for holding elements prior to processing.
    An instance of this class is used to generate a stream of pseudorandom numbers; its period is only 248.
    Marker interface used by List implementations to indicate that they support fast (generally constant time) random access.
    Resource bundles contain locale-specific objects.
    ResourceBundle.Control defines a set of callback methods that are invoked by the ResourceBundle.getBundle factory methods during the bundle loading process.
    A simple text scanner which can parse primitive types and strings using regular expressions.
    A facility to load implementations of a service.
    Represents a service provider located by ServiceLoader.
    A collection that contains no duplicate elements.
    A Map that further provides a total ordering on its keys.
    A Set that further provides a total ordering on its elements.
    An object for traversing and partitioning elements of a source.
    A Spliterator specialized for double values.
    A Spliterator specialized for int values.
    A Spliterator specialized for long values.
    A Spliterator specialized for primitive values.
    A generator of uniform pseudorandom values (with period 264) applicable for use in (among other contexts) isolated parallel computations that may generate subtasks.
    StringJoiner is used to construct a sequence of characters separated by a delimiter and optionally starting with a supplied prefix and ending with a supplied suffix.
    A task that can be scheduled for one-time or repeated execution by a Timer.
    TimeZone represents a time zone offset, and also figures out daylight savings.
    A class that represents an immutable universally unique identifier (UUID).
    The Vector class implements a growable array of objects.
  • Classes in java.util used by java.util.concurrent
    Class
    Description
    This class provides a skeletal implementation of the Collection interface, to minimize the effort required to implement this interface.
    This class provides a skeletal implementation of the Map interface, to minimize the effort required to implement this interface.
    This class provides skeletal implementations of some Queue operations.
    This class provides a skeletal implementation of the Set interface to minimize the effort required to implement this interface.
    The root interface in the collection hierarchy.
    A comparison function, which imposes a total ordering on some collection of objects.
    A linear collection that supports element insertion and removal at both ends.
    An object that implements the Enumeration interface generates a series of elements, one at a time.
    An iterator over a collection.
    An ordered collection (also known as a sequence).
    An iterator for lists that allows the programmer to traverse the list in either direction, modify the list during iteration, and obtain the iterator's current position in the list.
    An object that maps keys to values.
    A map entry (key-value pair).
    A SortedMap extended with navigation methods returning the closest matches for given search targets.
    A SortedSet extended with navigation methods reporting closest matches for given search targets.
    A collection designed for holding elements prior to processing.
    An instance of this class is used to generate a stream of pseudorandom numbers; its period is only 248.
    Marker interface used by List implementations to indicate that they support fast (generally constant time) random access.
    A collection that contains no duplicate elements.
    A Map that further provides a total ordering on its keys.
    A Set that further provides a total ordering on its elements.
    An object for traversing and partitioning elements of a source.
  • Class
    Description
    The root interface in the collection hierarchy.
    The class Date represents a specific instant in time, with millisecond precision.
  • Classes in java.util used by java.util.function
    Class
    Description
    A comparison function, which imposes a total ordering on some collection of objects.
  • Classes in java.util used by java.util.jar
    Class
    Description
    The root interface in the collection hierarchy.
    An object that implements the Enumeration interface generates a series of elements, one at a time.
    An object that maps keys to values.
    A map entry (key-value pair).
    A collection that contains no duplicate elements.
  • Classes in java.util used by java.util.logging
    Class
    Description
    An object that implements the Enumeration interface generates a series of elements, one at a time.
    An ordered collection (also known as a sequence).
    Resource bundles contain locale-specific objects.
  • Classes in java.util used by java.util.prefs
    Class
    Description
    A tagging interface that all event listener interfaces must extend.
    The root class from which all event state objects shall be derived.
  • Classes in java.util used by java.util.spi
    Class
    Description
    A Locale object represents a specific geographical, political, or cultural region.
    An object that maps keys to values.
    A container object which may or may not contain a non-null value.
    Resource bundles contain locale-specific objects.
    ResourceBundle.Control defines a set of callback methods that are invoked by the ResourceBundle.getBundle factory methods during the bundle loading process.
  • Classes in java.util used by java.util.stream
    Class
    Description
    The root interface in the collection hierarchy.
    A comparison function, which imposes a total ordering on some collection of objects.
    A state object for collecting statistics such as count, min, max, sum, and average.
    A state object for collecting statistics such as count, min, max, sum, and average.
    An iterator over a collection.
    An ordered collection (also known as a sequence).
    A state object for collecting statistics such as count, min, max, sum, and average.
    An object that maps keys to values.
    A container object which may or may not contain a non-null value.
    A container object which may or may not contain a double value.
    A container object which may or may not contain an int value.
    A container object which may or may not contain a long value.
    A collection that contains no duplicate elements.
    An object for traversing and partitioning elements of a source.
    A Spliterator specialized for double values.
    A Spliterator specialized for int values.
    A Spliterator specialized for long values.
  • Classes in java.util used by java.util.zip
    Class
    Description
    An object that implements the Enumeration interface generates a series of elements, one at a time.
  • Classes in java.util used by javax.accessibility
    Class
    Description
    ListResourceBundle is an abstract subclass of ResourceBundle that manages resources for a locale in a convenient and easy to use list.
    A Locale object represents a specific geographical, political, or cultural region.
    Resource bundles contain locale-specific objects.
    The Vector class implements a growable array of objects.
  • Class
    Description
    A Locale object represents a specific geographical, political, or cultural region.
    An object that maps keys to values.
    A collection that contains no duplicate elements.
  • Classes in java.util used by javax.imageio
    Class
    Description
    An iterator over a collection.
    An ordered collection (also known as a sequence).
    A Locale object represents a specific geographical, political, or cultural region.
    A collection that contains no duplicate elements.
  • Classes in java.util used by javax.imageio.event
    Class
    Description
    A tagging interface that all event listener interfaces must extend.
  • Class
    Description
    An ordered collection (also known as a sequence).
    A Locale object represents a specific geographical, political, or cultural region.
  • Class
    Description
    A Locale object represents a specific geographical, political, or cultural region.
  • Class
    Description
    A Locale object represents a specific geographical, political, or cultural region.
  • Class
    Description
    An ordered collection (also known as a sequence).
    A Set that further provides a total ordering on its elements.
  • Classes in java.util used by javax.imageio.spi
    Class
    Description
    An iterator over a collection.
    A Locale object represents a specific geographical, political, or cultural region.
  • Classes in java.util used by javax.lang.model
    Class
    Description
    An ordered collection (also known as a sequence).
  • Class
    Description
    An ordered collection (also known as a sequence).
    An object that maps keys to values.
    A collection that contains no duplicate elements.
  • Classes in java.util used by javax.lang.model.type
    Class
    Description
    An ordered collection (also known as a sequence).
  • Classes in java.util used by javax.lang.model.util
    Class
    Description
    An ordered collection (also known as a sequence).
    An object that maps keys to values.
    A collection that contains no duplicate elements.
  • Classes in java.util used by javax.management
    Class
    Description
    This class provides a skeletal implementation of the Collection interface, to minimize the effort required to implement this interface.
    This class provides a skeletal implementation of the List interface to minimize the effort required to implement this interface backed by a "random access" data store (such as an array).
    Resizable-array implementation of the List interface.
    The root interface in the collection hierarchy.
    A tagging interface that all event listener interfaces must extend.
    The root class from which all event state objects shall be derived.
    This class implements a hash table, which maps keys to values.
    An ordered collection (also known as a sequence).
    An object that maps keys to values.
    Marker interface used by List implementations to indicate that they support fast (generally constant time) random access.
    A collection that contains no duplicate elements.
    The Vector class implements a growable array of objects.
  • Class
    Description
    An object that implements the Enumeration interface generates a series of elements, one at a time.
    An ordered collection (also known as a sequence).
    An object that maps keys to values.
    A collection that contains no duplicate elements.
  • Class
    Description
    The root class from which all event state objects shall be derived.
  • Class
    Description
    The root interface in the collection hierarchy.
    The class Date represents a specific instant in time, with millisecond precision.
    An ordered collection (also known as a sequence).
    An object that maps keys to values.
    A map entry (key-value pair).
    A collection that contains no duplicate elements.
  • Class
    Description
    This class provides a skeletal implementation of the Collection interface, to minimize the effort required to implement this interface.
    This class provides a skeletal implementation of the List interface to minimize the effort required to implement this interface backed by a "random access" data store (such as an array).
    Resizable-array implementation of the List interface.
    The root interface in the collection hierarchy.
    A tagging interface that all event listener interfaces must extend.
    The root class from which all event state objects shall be derived.
    An ordered collection (also known as a sequence).
    An object that maps keys to values.
    Marker interface used by List implementations to indicate that they support fast (generally constant time) random access.
    The Vector class implements a growable array of objects.
  • Class
    Description
    The root class from which all event state objects shall be derived.
    An object that maps keys to values.
  • Class
    Description
    An object that maps keys to values.
    A collection that contains no duplicate elements.
  • Class
    Description
    The class Date represents a specific instant in time, with millisecond precision.
    The root class from which all event state objects shall be derived.
    The Vector class implements a growable array of objects.
  • Classes in java.util used by javax.naming
    Class
    Description
    An object that implements the Enumeration interface generates a series of elements, one at a time.
    This class implements a hash table, which maps keys to values.
    The Properties class represents a persistent set of properties.
    The Vector class implements a growable array of objects.
  • Class
    Description
    This class implements a hash table, which maps keys to values.
    The Vector class implements a growable array of objects.
  • Classes in java.util used by javax.naming.event
    Class
    Description
    A tagging interface that all event listener interfaces must extend.
    The root class from which all event state objects shall be derived.
  • Classes in java.util used by javax.naming.ldap
    Class
    Description
    An object that implements the Enumeration interface generates a series of elements, one at a time.
    A tagging interface that all event listener interfaces must extend.
    The root class from which all event state objects shall be derived.
    This class implements a hash table, which maps keys to values.
    An ordered collection (also known as a sequence).
  • Classes in java.util used by javax.naming.ldap.spi
    Class
    Description
    An ordered collection (also known as a sequence).
    An object that maps keys to values.
    A container object which may or may not contain a non-null value.
  • Classes in java.util used by javax.naming.spi
    Class
    Description
    This class implements a hash table, which maps keys to values.
  • Classes in java.util used by javax.net.ssl
    Class
    Description
    The root interface in the collection hierarchy.
    An object that implements the Enumeration interface generates a series of elements, one at a time.
    A tagging interface that all event listener interfaces must extend.
    The root class from which all event state objects shall be derived.
    An ordered collection (also known as a sequence).
    A container object which may or may not contain a non-null value.
  • Classes in java.util used by javax.print.attribute
    Class
    Description
    The class Date represents a specific instant in time, with millisecond precision.
    A Locale object represents a specific geographical, political, or cultural region.
  • Class
    Description
    This class provides a skeletal implementation of the Collection interface, to minimize the effort required to implement this interface.
    This class provides a skeletal implementation of the Map interface, to minimize the effort required to implement this interface.
    This class provides a skeletal implementation of the Set interface to minimize the effort required to implement this interface.
    The root interface in the collection hierarchy.
    The class Date represents a specific instant in time, with millisecond precision.
    Hash table based implementation of the Map interface.
    This class implements the Set interface, backed by a hash table (actually a HashMap instance).
    A Locale object represents a specific geographical, political, or cultural region.
    An object that maps keys to values.
    A collection that contains no duplicate elements.
  • Classes in java.util used by javax.print.event
    Class
    Description
    The root class from which all event state objects shall be derived.
  • Classes in java.util used by javax.script
    Class
    Description
    The root interface in the collection hierarchy.
    An ordered collection (also known as a sequence).
    An object that maps keys to values.
    A map entry (key-value pair).
    A collection that contains no duplicate elements.
  • Classes in java.util used by javax.security.auth
    Class
    Description
    A collection that contains no duplicate elements.
  • Class
    Description
    A Locale object represents a specific geographical, political, or cultural region.
  • Class
    Description
    The class Date represents a specific instant in time, with millisecond precision.
  • Class
    Description
    An object that maps keys to values.
  • Class
    Description
    An object that maps keys to values.
  • Class
    Description
    An object that maps keys to values.
  • Classes in java.util used by javax.security.cert
    Class
    Description
    The class Date represents a specific instant in time, with millisecond precision.
  • Classes in java.util used by javax.security.sasl
    Class
    Description
    An object that implements the Enumeration interface generates a series of elements, one at a time.
    An object that maps keys to values.
  • Classes in java.util used by javax.smartcardio
    Class
    Description
    An ordered collection (also known as a sequence).
  • Classes in java.util used by javax.sound.midi
    Class
    Description
    A tagging interface that all event listener interfaces must extend.
    An ordered collection (also known as a sequence).
    An object that maps keys to values.
    The Vector class implements a growable array of objects.
  • Classes in java.util used by javax.sound.sampled
    Class
    Description
    A tagging interface that all event listener interfaces must extend.
    The root class from which all event state objects shall be derived.
    An object that maps keys to values.
  • Classes in java.util used by javax.sql
    Class
    Description
    The Calendar class is an abstract class that provides methods for converting between a specific instant in time and a set of calendar fields such as YEAR, MONTH, DAY_OF_MONTH, HOUR, and so on, and for manipulating the calendar fields, such as getting the date of the next week.
    A tagging interface that all event listener interfaces must extend.
    The root class from which all event state objects shall be derived.
    An object that maps keys to values.
  • Classes in java.util used by javax.sql.rowset
    Class
    Description
    The Calendar class is an abstract class that provides methods for converting between a specific instant in time and a set of calendar fields such as YEAR, MONTH, DAY_OF_MONTH, HOUR, and so on, and for manipulating the calendar fields, such as getting the date of the next week.
    The root interface in the collection hierarchy.
    An object that maps keys to values.
  • Class
    Description
    An object that maps keys to values.
    The Vector class implements a growable array of objects.
  • Classes in java.util used by javax.sql.rowset.spi
    Class
    Description
    An object that implements the Enumeration interface generates a series of elements, one at a time.
  • Classes in java.util used by javax.swing
    Class
    Description
    The root interface in the collection hierarchy.
    A comparison function, which imposes a total ordering on some collection of objects.
    The class Date represents a specific instant in time, with millisecond precision.
    The Dictionary class is the abstract parent of any class, such as Hashtable, which maps keys to values.
    An object that implements the Enumeration interface generates a series of elements, one at a time.
    A tagging interface that all event listener interfaces must extend.
    The root class from which all event state objects shall be derived.
    This class implements a hash table, which maps keys to values.
    An ordered collection (also known as a sequence).
    A Locale object represents a specific geographical, political, or cultural region.
    An object that maps keys to values.
    A collection that contains no duplicate elements.
    The Vector class implements a growable array of objects.
  • Classes in java.util used by javax.swing.event
    Class
    Description
    A tagging interface that all event listener interfaces must extend.
    The root class from which all event state objects shall be derived.
  • Class
    Description
    A tagging interface that all event listener interfaces must extend.
    This class implements a hash table, which maps keys to values.
    The Vector class implements a growable array of objects.
  • Class
    Description
    A tagging interface that all event listener interfaces must extend.
  • Class
    Description
    The Vector class implements a growable array of objects.
  • Class
    Description
    A tagging interface that all event listener interfaces must extend.
  • Classes in java.util used by javax.swing.table
    Class
    Description
    A comparison function, which imposes a total ordering on some collection of objects.
    An object that implements the Enumeration interface generates a series of elements, one at a time.
    A tagging interface that all event listener interfaces must extend.
    A Locale object represents a specific geographical, political, or cultural region.
    The Vector class implements a growable array of objects.
  • Classes in java.util used by javax.swing.text
    Class
    Description
    The Dictionary class is the abstract parent of any class, such as Hashtable, which maps keys to values.
    An object that implements the Enumeration interface generates a series of elements, one at a time.
    A tagging interface that all event listener interfaces must extend.
    The Vector class implements a growable array of objects.
  • Classes in java.util used by javax.swing.text.html
    Class
    Description
    An object that implements the Enumeration interface generates a series of elements, one at a time.
    A tagging interface that all event listener interfaces must extend.
    The root class from which all event state objects shall be derived.
    The Vector class implements a growable array of objects.
  • Class
    Description
    This class implements a vector of bits that grows as needed.
    An object that implements the Enumeration interface generates a series of elements, one at a time.
    This class implements a hash table, which maps keys to values.
    The Vector class implements a growable array of objects.
  • Classes in java.util used by javax.swing.tree
    Class
    Description
    An object that implements the Enumeration interface generates a series of elements, one at a time.
    A tagging interface that all event listener interfaces must extend.
    The root class from which all event state objects shall be derived.
    The Vector class implements a growable array of objects.
  • Classes in java.util used by javax.swing.undo
    Class
    Description
    A tagging interface that all event listener interfaces must extend.
    This class implements a hash table, which maps keys to values.
    The Vector class implements a growable array of objects.
  • Classes in java.util used by javax.tools
    Class
    Description
    The root interface in the collection hierarchy.
    An iterator over a collection.
    An ordered collection (also known as a sequence).
    A Locale object represents a specific geographical, political, or cultural region.
    A facility to load implementations of a service.
    A collection that contains no duplicate elements.
  • Classes in java.util used by javax.xml.crypto
    Class
    Description
    An iterator over a collection.
  • Classes in java.util used by javax.xml.crypto.dom
    Class
    Description
    An iterator over a collection.
    A map entry (key-value pair).
  • Classes in java.util used by javax.xml.crypto.dsig
    Class
    Description
    An ordered collection (also known as a sequence).
  • Class
    Description
    An ordered collection (also known as a sequence).
  • Class
    Description
    An ordered collection (also known as a sequence).
    An object that maps keys to values.
  • Classes in java.util used by javax.xml.datatype
    Class
    Description
    The Calendar class is an abstract class that provides methods for converting between a specific instant in time and a set of calendar fields such as YEAR, MONTH, DAY_OF_MONTH, HOUR, and so on, and for manipulating the calendar fields, such as getting the date of the next week.
    The class Date represents a specific instant in time, with millisecond precision.
    GregorianCalendar is a concrete subclass of Calendar and provides the standard calendar system used by most of the world.
    A Locale object represents a specific geographical, political, or cultural region.
    TimeZone represents a time zone offset, and also figures out daylight savings.
  • Classes in java.util used by javax.xml.namespace
    Class
    Description
    An iterator over a collection.
  • Classes in java.util used by javax.xml.stream
    Class
    Description
    An iterator over a collection.
  • Class
    Description
    An iterator over a collection.
    An ordered collection (also known as a sequence).
  • Classes in java.util used by javax.xml.stream.util
    Class
    Description
    An iterator over a collection.
  • Classes in java.util used by javax.xml.transform
    Class
    Description
    The Properties class represents a persistent set of properties.
  • Classes in java.util used by javax.xml.xpath
    Class
    Description
    An iterator over a collection.
    An ordered collection (also known as a sequence).
  • Classes in java.util used by jdk.dynalink.beans
    Class
    Description
    A collection that contains no duplicate elements.
  • Classes in java.util used by jdk.dynalink.linker
    Class
    Description
    An ordered collection (also known as a sequence).
  • Class
    Description
    An ordered collection (also known as a sequence).
  • Classes in java.util used by jdk.incubator.foreign
    Class
    Description
    An ordered collection (also known as a sequence).
    A container object which may or may not contain a non-null value.
    A container object which may or may not contain a long value.
    An object for traversing and partitioning elements of a source.
  • Classes in java.util used by jdk.javadoc.doclet
    Class
    Description
    An ordered collection (also known as a sequence).
    A Locale object represents a specific geographical, political, or cultural region.
    A collection that contains no duplicate elements.
  • Classes in java.util used by jdk.jfr
    Class
    Description
    An ordered collection (also known as a sequence).
    An object that maps keys to values.
    A collection that contains no duplicate elements.
  • Classes in java.util used by jdk.jfr.consumer
    Class
    Description
    An ordered collection (also known as a sequence).
    An object that maps keys to values.
  • Classes in java.util used by jdk.jshell
    Class
    Description
    The root interface in the collection hierarchy.
    An ordered collection (also known as a sequence).
    A Locale object represents a specific geographical, political, or cultural region.
    An object that maps keys to values.
  • Classes in java.util used by jdk.jshell.execution
    Class
    Description
    An ordered collection (also known as a sequence).
    An object that maps keys to values.
  • Classes in java.util used by jdk.jshell.spi
    Class
    Description
    An ordered collection (also known as a sequence).
    An object that maps keys to values.
  • Classes in java.util used by jdk.jshell.tool
    Class
    Description
    A Locale object represents a specific geographical, political, or cultural region.
    An object that maps keys to values.
  • Classes in java.util used by jdk.management.jfr
    Class
    Description
    An ordered collection (also known as a sequence).
    An object that maps keys to values.
  • Classes in java.util used by jdk.net
    Class
    Description
    A collection that contains no duplicate elements.
  • Classes in java.util used by org.xml.sax
    Class
    Description
    A Locale object represents a specific geographical, political, or cultural region.
  • Classes in java.util used by org.xml.sax.helpers
    Class
    Description
    An object that implements the Enumeration interface generates a series of elements, one at a time.
    A Locale object represents a specific geographical, political, or cultural region.