Module java.base

java.base defines and exports the core APIs of the Java SE platform.

Packages

Exported Packages

Package	Module	Description
java.io	All Modules	Provides for system input and output through data streams, serialization and the file system.
java.lang	All Modules	Provides classes that are fundamental to the design of the Java programming language.
java.lang.annotation	All Modules	Provides library support for the Java programming language annotation facility.
java.lang.invoke	All Modules	The java.lang.invoke package contains dynamic language support provided directly by the Java core class libraries and virtual machine.
java.lang.module	All Modules	Classes to support module descriptors and creating configurations of modules by means of resolution and service binding.
java.lang.ref	All Modules	Provides reference-object classes, which support a limited degree of interaction with the garbage collector.
java.lang.reflect	All Modules	Provides classes and interfaces for obtaining reflective information about modules, classes and objects.
java.math	All Modules	Provides classes for performing arbitrary-precision integer arithmetic (BigInteger) and arbitrary-precision decimal arithmetic (BigDecimal).
java.net	All Modules	Provides the classes for implementing networking applications.
java.net.spi	All Modules	Service-provider classes for the java.net package.
java.nio	All Modules	Defines buffers, which are containers for data, and provides an overview of the other NIO packages.
java.nio.channels	All Modules	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.
java.nio.channels.spi	All Modules	Service-provider classes for the java.nio.channels package.
java.nio.charset	All Modules	Defines charsets, decoders, and encoders, for translating between bytes and Unicode characters.
java.nio.charset.spi	All Modules	Service-provider classes for the java.nio.charset package.
java.nio.file	All Modules	Defines interfaces and classes for the Java virtual machine to access files, file attributes, and file systems.
java.nio.file.attribute	All Modules	Interfaces and classes providing access to file and file system attributes.
java.nio.file.spi	All Modules	Service-provider classes for the java.nio.file package.
java.security	All Modules	Provides the classes and interfaces for the security framework.
java.security.acl	All Modules	The classes and interfaces in this package have been deprecated.
java.security.cert	All Modules	Provides classes and interfaces for parsing and managing certificates, certificate revocation lists (CRLs), and certification paths.
java.security.interfaces	All Modules	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.
java.security.spec	All Modules	Provides classes and interfaces for key specifications and algorithm parameter specifications.
java.text	All Modules	Provides classes and interfaces for handling text, dates, numbers, and messages in a manner independent of natural languages.
java.text.spi	All Modules	Service provider classes for the classes in the java.text package.
java.time	All Modules	The main API for dates, times, instants, and durations.
java.time.chrono	All Modules	Generic API for calendar systems other than the default ISO.
java.time.format	All Modules	Provides classes to print and parse dates and times.
java.time.temporal	All Modules	Access to date and time using fields and units, and date time adjusters.
java.time.zone	All Modules	Support for time-zones and their rules.
java.util	All Modules	Contains the collections framework, legacy collection classes, event model, date and time facilities, internationalization, and miscellaneous utility classes (a string tokenizer, a random-number generator, and a bit array).
java.util.concurrent	All Modules	Utility classes commonly useful in concurrent programming.
java.util.concurrent.atomic	All Modules	A small toolkit of classes that support lock-free thread-safe programming on single variables.
java.util.concurrent.locks	All Modules	Interfaces and classes providing a framework for locking and waiting for conditions that is distinct from built-in synchronization and monitors.
java.util.function	All Modules	Functional interfaces provide target types for lambda expressions and method references.
java.util.jar	All Modules	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.
java.util.regex	All Modules	Classes for matching character sequences against patterns specified by regular expressions.
java.util.spi	All Modules	Service provider classes for the classes in the java.util package.
java.util.stream	All Modules	Classes to support functional-style operations on streams of elements, such as map-reduce transformations on collections.
java.util.zip	All Modules	Provides classes for reading and writing the standard ZIP and GZIP file formats.
javax.crypto	All Modules	Provides the classes and interfaces for cryptographic operations.
javax.crypto.interfaces	All Modules	Provides interfaces for Diffie-Hellman keys as defined in RSA Laboratories' PKCS #3.
javax.crypto.spec	All Modules	Provides classes and interfaces for key specifications and algorithm parameter specifications.
javax.net	All Modules	Provides classes for networking applications.
javax.net.ssl	All Modules	Provides classes for the secure socket package.
javax.security.auth	All Modules	This package provides a framework for authentication and authorization.
javax.security.auth.callback	All Modules	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).
javax.security.auth.login	All Modules	This package provides a pluggable authentication framework.
javax.security.auth.spi	All Modules	This package provides the interface to be used for implementing pluggable authentication modules.
javax.security.auth.x500	All Modules	This package contains the classes that should be used to store X500 Principal and X500 Private Credentials in a Subject.
javax.security.cert	All Modules	Provides classes for public key certificates.
sun.util.calendar	java.corba
com.sun.security.ntlm	java.security.sasl
jdk.internal.jimage	jdk.jlink
jdk.internal.jimage.decompressor	jdk.jlink
jdk.internal.logger	java.logging
jdk.internal.org.objectweb.asm	jdk.jfr jdk.vm.ci jdk.jlink jdk.scripting.nashorn java.instrument
jdk.internal.org.objectweb.asm.tree	jdk.jfr jdk.jlink java.instrument
jdk.internal.org.objectweb.asm.util	jdk.jfr jdk.jlink jdk.scripting.nashorn java.instrument
jdk.internal.org.objectweb.asm.tree.analysis	jdk.jlink
jdk.internal.org.objectweb.asm.commons	jdk.jfr jdk.scripting.nashorn java.instrument
jdk.internal.org.objectweb.asm.signature	jdk.scripting.nashorn
jdk.internal.loader	java.desktop java.instrument
jdk.internal.math	java.desktop
jdk.internal.module	jdk.jfr java.management jdk.jlink jdk.dynalink java.instrument jdk.jartool jdk.management.resource
jdk.internal.misc	java.desktop java.corba java.httpclient java.security.jgss jdk.vm.ci jdk.jlink jdk.unsupported jdk.scripting.nashorn jdk.jfr jdk.compiler java.naming java.logging java.management jdk.net jdk.charsets java.sql java.rmi jdk.jartool jdk.management.resource java.xml
jdk.internal.perf	java.desktop java.management jdk.jvmstat
jdk.internal.ref	java.desktop
jdk.internal.reflect	java.corba java.logging jdk.vm.cds jdk.unsupported java.sql.rowset jdk.scripting.nashorn java.sql jdk.dynalink
jdk.internal.vm.annotation	jdk.vm.ci jdk.unsupported
jdk.internal.util.jar	jdk.jartool
jdk.internal.vm	java.management jdk.jvmstat
sun.net	java.httpclient
sun.net.ext	jdk.net
sun.net.dns	java.security.jgss jdk.naming.dns
sun.net.util	jdk.jconsole java.desktop jdk.naming.dns
sun.net.www	java.desktop jdk.jartool
sun.net.www.protocol.http	java.security.jgss
sun.nio.ch	jdk.sctp java.management jdk.net jdk.crypto.pkcs11 jdk.management.resource
sun.nio.cs	java.desktop jdk.charsets
sun.nio.fs	jdk.unsupported
sun.reflect.annotation	jdk.compiler
sun.reflect.generics.reflectiveObjects	java.desktop
sun.reflect.misc	java.desktop java.corba java.xml.ws java.management java.sql.rowset java.datatransfer java.rmi java.xml
sun.security.action	java.desktop java.security.jgss jdk.crypto.pkcs11
sun.security.internal.interfaces	jdk.crypto.pkcs11
sun.security.internal.spec	jdk.crypto.pkcs11
sun.security.jca	java.smartcardio jdk.naming.dns jdk.crypto.ec jdk.crypto.pkcs11 java.xml.crypto
sun.security.pkcs	jdk.crypto.ec jdk.jartool
sun.security.provider	java.security.jgss jdk.crypto.pkcs11 java.rmi jdk.policytool jdk.security.auth
sun.security.provider.certpath	java.naming
sun.security.rsa	jdk.crypto.pkcs11
sun.security.ssl	java.security.jgss
sun.security.tools	jdk.jartool
sun.security.util	java.desktop java.naming jdk.security.jgss java.security.jgss java.smartcardio jdk.crypto.ec jdk.crypto.pkcs11 java.rmi jdk.jartool jdk.policytool java.security.sasl jdk.security.auth
sun.security.x509	jdk.crypto.ec jdk.crypto.pkcs11 jdk.jartool jdk.security.auth
sun.text.resources	jdk.localedata
sun.util.cldr	jdk.jlink
sun.util.locale.provider	java.desktop jdk.localedata jdk.jlink
sun.util.logging	java.desktop java.logging java.prefs
sun.util.resources	jdk.localedata
jdk.internal	jdk.jfr
jdk.internal.org.xml.sax	jdk.jfr
jdk.internal.org.xml.sax.helpers	jdk.jfr
jdk.internal.util.xml	jdk.jfr
jdk.internal.util.xml.impl	jdk.jfr
sun.net.sdp	jdk.net

Services

Uses

Type	Description
System.LoggerFinder	The LoggerFinder service is responsible for creating, managing, and configuring loggers to the underlying framework it uses.
ContentHandlerFactory	This interface defines a factory for content handlers.
URLStreamHandlerProvider	URL stream handler service-provider class.
AsynchronousChannelProvider	Service-provider class for asynchronous channels.
SelectorProvider	Service-provider class for selectors and selectable channels.
CharsetProvider	Charset service-provider class.
FileSystemProvider	Service-provider class for file systems.
FileTypeDetector	A file type detector for probing a file to guess its file type.
Provider	This class represents a "provider" for the Java Security API, where a provider implements some or all parts of Java Security.
BreakIteratorProvider	An abstract class for service providers that provide concrete implementations of the BreakIterator class.
CollatorProvider	An abstract class for service providers that provide concrete implementations of the Collator class.
DateFormatProvider	An abstract class for service providers that provide concrete implementations of the DateFormat class.
DateFormatSymbolsProvider	An abstract class for service providers that provide instances of the DateFormatSymbols class.
DecimalFormatSymbolsProvider	An abstract class for service providers that provide instances of the DecimalFormatSymbols class.
NumberFormatProvider	An abstract class for service providers that provide concrete implementations of the NumberFormat class.
AbstractChronology	An abstract implementation of a calendar system, used to organize and identify dates.
Chronology	A calendar system, used to organize and identify dates.
ZoneRulesProvider	Provider of time-zone rules to the system.
CalendarDataProvider	An abstract class for service providers that provide locale-dependent Calendar parameters.
CalendarNameProvider	An abstract class for service providers that provide localized string representations (display names) of Calendar field values.
CurrencyNameProvider	An abstract class for service providers that provide localized currency symbols and display names for the Currency class.
LocaleNameProvider	An abstract class for service providers that provide localized names for the Locale class.
ResourceBundleControlProvider	An interface for service providers that provide implementations of ResourceBundle.Control.
ResourceBundleProvider	ResourceBundleProvider is a provider interface that is used for loading resource bundles for named modules.
TimeZoneNameProvider	An abstract class for service providers that provide localized time zone names for the TimeZone class.
LoginModule	Service-provider interface for authentication technology providers.
jdk.internal.logger.DefaultLoggerFinder	Internal Service Provider Interface (SPI) that makes it possible to use java.util.logging as backend when the sun.util.logging.internal.LoggingProviderImpl is present.
sun.security.ssl.ClientKeyExchangeService	Models a service that provides support for a particular client key exchange mode.
sun.util.spi.CalendarProvider	An abstract class for service providers that provide instances of the Calendar class.
sun.util.locale.provider.LocaleDataMetaInfo	LocaleData meta info SPI
sun.util.resources.LocaleData.CommonResourceBundleProvider	A ResourceBundleProvider implementation for loading locale data resource bundles except for the java.time supplementary data.
sun.util.resources.LocaleData.SupplementaryResourceBundleProvider	A ResourceBundleProvider implementation for loading supplementary resource bundles for java.time.

Provides

Type	Description
FileSystemProvider (Implementation: jdk.internal.jrtfs.JrtFileSystemProvider)	Service-provider class for file systems.