package

Package in Java is a mechanism to encapsulate a group of classes, sub packages and interfaces. Packages are used for:

§  Preventing naming conflicts. For example there can be two classes with name Employee in two packages, college.staff.cse.Employee and college.staff.ee.Employee

§  Making searching/locating and usage of classes, interfaces, enumerations and annotations easier

§  Providing controlled access: protected and default have package level access control. A protected member is accessible by classes in the same package and its subclasses. A default member (without any access specifier) is accessible by classes in the same package only.

§  Packages can be considered as data encapsulation (or data-hiding).

Example creating package

Package cse;// created package cse

Class bkec

{

 Public void show( )

{

 System.out.println(“ this is cse package”);

}

}

Class bet

{

 Public static void main( string argc[])

{ bkec b=new bkec( );

b.show( );

}

 importing package 

Create one new file & calling the method show from package cse

Import cse.*;//calling package 

Class cse1

{ Public static void main( string argc[])

{ bkec b=new bkec( );

b.show( );

}

Next Topics
Exception Handling

Interface

Multi threading

Applet