Java API Packages

A package represents a directory that contains related group of classes and interfaces.

Examples: java.io.*;

Which contains all the classes and interfaces related to input and output.

The following are the different packages in java API

1. java.io.*; - Input/Output classes, they provide facilities for input and output of data

2. java.lang.*; - language support classes. Java compiler itself uses and therefore they are automatically imported.

3. java.util.*; - The package contains useful classes and interfaces like stack, vector, array etc

4. java.awt.* - AWT stands for abstract window toolkit. This package helps tp develop GUI Where programe with colorful screens, painting and images can be developed.

5. java.net.*; - consists of classes for networking. Client server programming can be done using package.

6. java.applet.*;  - classes for creating and implementing applets.

7. java.text.*; - The package has two important classes, DateFormat to format date and time, and NumberFormat which is useful to format numeric values.

8. java.sql.*; - This package helps to connect the databases like Oracle, retrieve the data from them and use it in a java programe.