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.instrument
- Provides services that allow Java programming language
agents to instrument programs running on the JVM.
java.lang.management
- Provides the management interface for monitoring and
management of the Java virtual machine as well as the
operating system on which the Java virtual machine is
running.
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.util
- Contains the collectsions 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
- 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.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.logging
- Provides the classes and interfaces of the Java 2
platform's core logging facilities.
java.util.regex
- Classes for matching character sequences against patterns
specified by regular expressions.
java.util.prefs
- This package allows applications to store and retrieve user
and system preference and configuration data.
java.util.spi
- Service provider classes for the classes in the java.util
package.
java.util.zip
- Provides classes for reading and writing the standard ZIP
and GZIP file formats.
