Hi Friend,

Try this:

abstract class Shape {
  abstract public double area();
}
public class AbstractClassExample extends Shape {

    static int l, b;
    public AbstractClassExample() {
        l = 5;
        b = 2;
    }
    public double area() {
        return l*b;
    }
    public void display() {
        System.out.println("Length: " + l + ",Breadth: " + b);
        System.out.println(area());
    }
    public static void main(String args[]) {
        AbstractClassExample p = new AbstractClassExample();
        p.display();

    }
}

For more information, visit the following links:

http://www.roseindia.net/help/java/a/java-abstract-class.shtml

http://www.roseindia.net/java/master-java/abstract-class.shtml

Thanks