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Any Java implementation must pass the Java Technology Compatibility Kit

tests for compliance, which includes JCL tests.

JCL Features are accessed through classes provided in packages.

• java.lang contains fundamental classes and interfaces closely tied to

the language and runtime system.

• I/O and networking access the platform file system, and more generally

networks through the java.io, java.nio and java.net packages. For

networking, SCTP is available through com.sun.nio.sctp.

• Mathematics package: java.math provides mathematical expressions and

evaluation, as well as arbitrary-precision decimal and integer number

datatypes.

• Collections and Utilities : built-in Collection data structures, and

utility classes, for regular expressions, concurrency, logging and

data compression.

• GUI and 2D Graphics: the AWT package (java.awt) basic GUI operations

and binds to the underlying native system. It also contains the 2D

Graphics API. The Swing package (javax.swing) is built on AWT and

provides a platform-independent widget toolkit, as well as a

pluggable look and feel. It also deals with editable and non-editable

text components.

• Sound: interfaces and classes for reading, writing, sequencing, and

synthesizing of sound data.

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