Types Of Package In Java | How to Import Predefined & Userdefined Package In Java

Types of packages

There are two types of java package and they are:

   ·       Built in package

   ·       User define package

Fig: Types of Package

    1.    Built-in-Packages:-

These packages consist of a large number of classes which are a part of Java API.Some of the commonly used built-in packages are:

Fig: Built in package

1) java.lang: Contains language support classes(e.g classed which defines primitive data types, math operations). This package is automatically imported.

2)  java.io: Contains classed for supporting input / output operations.

3)  java.util: Contains utility classes which implement data structures like Linked List, Dictionary and support ; for Date / Time operations.

4)  java.applet: Contains classes for creating Applets.

5)  java.awt: Contain classes for implementing the components for graphical user interfaces (like button , ;menus etc).

6)  java.net: Contain classes for supporting networking operations.

2.   User-defined-packages:-

These are the packages that are defined by the user. First we create a directory myPackage (name should be same as the name of the package). Then create the MyClass inside the directory with the first statement being the package names.