User Defined Package in Java

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
  1. package abhi;  
  2. public class Demo {  
  3.  public void sum(int num1, int num2) {  
  4.   int result;  
  5.   result = num1 + num2;  
  6.   System.out.println("the sum of two numbers is:" + result);  
  7.  }  
  8. }  
Tester.java
  1. import abhi.Demo;  
  2. class Tester extends Demo {  
  3.  public static void main(String args[]) {  
  4.   Tester obj = new Tester();  
  5.   obj.sum(1020);  
  6.  }  
  7. }  
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
 
Image-1.jpg
 
 
Image-2.jpg