API

Application program interface (API):

1. Language support package-A collection of classes and methods used for implementing basic features of java


2. Utilities package-A collection of classes to provide utiity function such as date and time


3. Applet package-A collection of classes used to create applets


4. Abstract window-A collection of classes used to implement graphical user interface


5. Input/Output-A collection of classes used for Input/output manipulation