User Defined Package in Java

User defined package is created with the help of “package” keyword. Whereas to use a package we use the import keyword.

Introduction 

 

A user-defined package is created with the help of the “package” keyword. Whereas to use a package we use the import keyword.

  

Demo.java

package abhi;
public class Demo {
 public void sum(int num1, int num2) {
  int result;
  result = num1 + num2;
  System.out.println("the sum of two numbers is:" + result);
 }
}

Tester.java

import abhi.Demo;
class Tester extends Demo {
 public static void main(String args[]) {
  Tester obj = new Tester();
  obj.sum(10, 20);
 }
}

Procedure to run the program:

 

First compile the Demo.java as follows:

 

For compilation Demo.java:

 

javac –d . Demo.java

 

Secondly, compile the Tester.java in another Command Prompt.

 

For compilation Tester.java:

 

javac Tester.java

 

java Tester

 

Output