Java-API Packages

API Packages

Java APl(Application Program Interface) provides a large numbers of classes grouped into different packages according to functionality. Most of the time we use the packages available with the the Java API. Following figure shows the system packages that are frequently used in the programs.

Java System Packages and Their Classes

java.lang Language support classes. They include classes for primitive types, string, math functions, thread and exceptions.
java.util Language utility classes such as vectors, hash tables, random numbers, data, etc. Input/output support classes. They provide facilities for the input and output of data.
java.applet Classes for creating and implementing applets. Classes for networking. They include classes for communicating with local computers as well as with internet servers.
java.awt Set of classes for implementing graphical user interface. They include classes for windows, buttons, lists, menus and so on.

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