Module java.base

Defines the foundational APIs of the Java SE Platform.
Providers:
The JDK implementation of this module provides an implementation of the jrt file system provider to enumerate and read the class and resource files in a run-time image. The jrt file system can be created by calling FileSystems.newFileSystem(URI.create("jrt:/")).
Tool Guides:
java launcher, keytool
Since:
9
  • Packages

    Exports 
    Package Description
    java.io
    Provides for system input and output through data streams, serialization and the file system.
    java.lang
    Provides classes that are fundamental to the design of the Java programming language.
    java.lang.annotation
    Provides library support for the Java programming language annotation facility.
    java.lang.constant
    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.
    java.lang.invoke
    The java.lang.invoke package provides low-level primitives for interacting with the Java Virtual Machine.
    java.lang.module
    Classes to support module descriptors and creating configurations of modules by means of resolution and service binding.
    java.lang.ref
    Provides reference-object classes, which support a limited degree of interaction with the garbage collector.
    java.lang.reflect
    Provides classes and interfaces for obtaining reflective information about classes and objects.
    java.lang.runtime
    The java.lang.runtime package provides low-level runtime support for the Java language.
    java.math
    Provides classes for performing arbitrary-precision integer arithmetic (BigInteger) and arbitrary-precision decimal arithmetic (BigDecimal).
    java.net
    Provides the classes for implementing networking applications.
    java.net.spi
    Service-provider classes for the java.net package.
    java.nio
    Defines buffers, which are containers for data, and provides an overview of the other NIO packages.
    java.nio.channels
    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
    Service-provider classes for the java.nio.channels package.
    java.nio.charset
    Defines charsets, decoders, and encoders, for translating between bytes and Unicode characters.
    java.nio.charset.spi
    Service-provider classes for the java.nio.charset package.
    java.nio.file
    Defines interfaces and classes for the Java virtual machine to access files, file attributes, and file systems.
    java.nio.file.attribute
    Interfaces and classes providing access to file and file system attributes.
    java.nio.file.spi
    Service-provider classes for the java.nio.file package.
    java.security
    Provides the classes and interfaces for the security framework.
    java.security.cert
    Provides classes and interfaces for parsing and managing certificates, certificate revocation lists (CRLs), and certification paths.
    java.security.interfaces
    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
    Provides classes and interfaces for key specifications and algorithm parameter specifications.
    java.text
    Provides classes and interfaces for handling text, dates, numbers, and messages in a manner independent of natural languages.
    java.text.spi
    Service provider classes for the classes in the java.text package.
    java.time
    The main API for dates, times, instants, and durations.
    java.time.chrono
    Generic API for calendar systems other than the default ISO.
    java.time.format
    Provides classes to print and parse dates and times.
    java.time.temporal
    Access to date and time using fields and units, and date time adjusters.
    java.time.zone
    Support for time-zones and their rules.
    java.util
    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.
    java.util.concurrent
    Utility classes commonly useful in concurrent programming.
    java.util.concurrent.atomic
    A small toolkit of classes that support lock-free thread-safe programming on single variables.
    java.util.concurrent.locks
    Interfaces and classes providing a framework for locking and waiting for conditions that is distinct from built-in synchronization and monitors.
    java.util.function
    Functional interfaces provide target types for lambda expressions and method references.
    java.util.jar
    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
    Classes for matching character sequences against patterns specified by regular expressions.
    java.util.spi
    Service provider classes for the classes in the java.util package.
    java.util.stream
    Classes to support functional-style operations on streams of elements, such as map-reduce transformations on collections.
    java.util.zip
    Provides classes for reading and writing the standard ZIP and GZIP file formats.
    javax.crypto
    Provides the classes and interfaces for cryptographic operations.
    javax.crypto.interfaces
    Provides interfaces for Diffie-Hellman keys as defined in RSA Laboratories' PKCS #3.
    javax.crypto.spec
    Provides classes and interfaces for key specifications and algorithm parameter specifications.
    javax.net
    Provides classes for networking applications.
    javax.net.ssl
    Provides classes for the secure socket package.
    javax.security.auth
    This package provides a framework for authentication and authorization.
    javax.security.auth.callback
    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
    This package provides a pluggable authentication framework.
    javax.security.auth.spi
    This package provides the interface to be used for implementing pluggable authentication modules.
    javax.security.auth.x500
    This package contains the classes that should be used to store X500 Principal and X500 Private Credentials in a Subject.
    javax.security.cert
    Provides classes for public key certificates.
    jdk.crac
    Provides explicit coordination with a checkpoint/restore mechanism.
  • Services

    Provides 
    Type Description
    FileSystemProvider  
    Uses 
    Type Description
    AbstractChronology
    An abstract implementation of a calendar system, used to organize and identify dates.
    AsynchronousChannelProvider
    Service-provider class for asynchronous channels.
    BreakIteratorProvider
    An abstract class for service providers that provide concrete implementations of the BreakIterator class.
    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.
    CharsetProvider
    Charset service-provider class.
    Chronology
    A calendar system, used to organize and identify dates.
    CollatorProvider
    An abstract class for service providers that provide concrete implementations of the Collator class.
    ContentHandlerFactory
    This interface defines a factory for content handlers.
    CurrencyNameProvider
    An abstract class for service providers that provide localized currency symbols and display names for the Currency 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.
    FileSystemProvider
    Service-provider class for file systems.
    FileTypeDetector
    A file type detector for probing a file to guess its file type.
    LocaleNameProvider
    An abstract class for service providers that provide localized names for the Locale class.
    LoginModule
    Service-provider interface for authentication technology providers.
    NumberFormatProvider
    An abstract class for service providers that provide concrete implementations of the NumberFormat class.
    Provider
    This class represents a "provider" for the Java Security API, where a provider implements some or all parts of Java Security.
    ResourceBundleControlProvider
    An interface for service providers that provide implementations of ResourceBundle.Control.
    ResourceBundleProvider
    ResourceBundleProvider is a service provider interface for resource bundles.
    SelectorProvider
    Service-provider class for selectors and selectable channels.
    System.LoggerFinder
    The LoggerFinder service is responsible for creating, managing, and configuring loggers to the underlying framework it uses.
    TimeZoneNameProvider
    An abstract class for service providers that provide localized time zone names for the TimeZone class.
    ToolProvider
    An interface for command-line tools to provide a way to be invoked without necessarily starting a new VM.
    URLStreamHandlerProvider
    URL stream handler service-provider class.
    ZoneRulesProvider
    Provider of time-zone rules to the system.