Shows the use of class in the program in java

This is a Java program which shows the use of class in the program

Program:

1. class Rectangle
2. {
3.  int height;
4.  int width;
5.  void area()
6.  {
7.   int result=height*width;
8.   System.out.println(“The area is ”+result); 
9.  }
10. }
11. class classDemo
12. {
13.  public static void main(String args[])
14.  {
15.   Rectangle obj=new Rectangle();
16.   obj.height=10;//setting the attribute values 
17.   obj.width=20;//from outside of class
18.   obj.area();//using object method of class is called
19.  }
20. }