Java Packages
A package is used to group related classes.
packages help in avoiding name conflicts
There are two types of packages :
Build-in packages - java APIUser-defined packages - Custom packages

Using a java package :
Import keyword is used to import packages in the java program. Example :
1. import java lang * - import
2. import java string - import string from java long
3. s= new java long string ( " Harry " ) - use without importing