Packages in java

Package:

• Package is a java-folder or directory.
• Package is a set of related classes, abstract classes and interfaces.
• In general, folders are created to maintain the related information separately and to access them effectively at later time.

Note: Java API (library) is a collection of Packages and package is a collection of classes. Package convention rule is ‘lower case’. ‘java’ is a super package of all other packages in java API.

Java API:

• ‘java’ is the super package of all packages – in core level
• ‘javax’ is the new package for GUI implementation

Java Default Package:

• ‘lang’ package is called default package in java.
• ‘lang’ package classes available directly into every java application.
• These classes mainly used in basic java application development.

import java.lang.String ; /* optional */
import java.lang.System ; 
class Program 
{
	public static void main(String[] args) 
	{
		System.out.println("Hello World!");
	}
}