Java Package

In Java, a package is a group of related types of classes, interfaces, enumerations, and sub-packages.

Packages are used to prevent naming conflicts, and to control access.

Packages are two types:

• Inbuilt Packages
• User-defined Packages

Inbuilt Packages

The existing packages in Java are called as inbuilt packages. Some of the inbuilt packages are Java, lang, io, util, awt, javax, swing, net, and etc.

User-defined Packages

To create a package is quite simple. To include a package command along with the package name of the first statement in the Java source file. That packages contain the classes, interfaces, and annotation types which you can include in the package.

Syntax:

 package mypackage;  

If a package statement is not used then the class placed to default package, which has no name.

Import a Package

The import keyword helps to access the classes and interface of another package.

• import package.*;
• import package.classname;

Example

import packagename.*;

package calculate;  // package name
public class B
{  
	public void show()
	{
		System.out.println("Welcome to Onlinetpoint");
	}  
} 

package circle;  // package name
import calculate.*; // imported calculate package 
  
public class Importpackage
{  
	public static void main(String args[])
	{  
		B b = new B();  
		b.show();  
	}  
}   

Example

import package.classname;

package calculate;  // package name
public class B
{  
	public void show()
	{
		System.out.println("Welcome to Onlinetpoint");
	}  
} 

package circle;  // package name
import calculate.B; // imported packagename and class name
  
public class Importpackage
{  
	public static void main(String args[])
	{  
		B b = new B();  
		b.show();  
	}  
}