SINGLE INHERITANCE :

SINGLE INHERITANCE :

The below diagram represents the single inheritance in java where Class B extends only one class Class A. Here Class B will be the Sub class and Class A will be one and only Super class.

 class Shape 
{
    int length;
    int breadth;
}
public class Rectangle extends Shape
{
    int area;
    public void calcualteArea()
    {
        area = length*breadth;
    }
    public static void main(String args[])
    {
        Rectangle r = new Rectangle();
        //Assigning values to Shape class attributes
        r.length = 10;
        r.breadth = 20;
        //Calculate the area
        r.calcualteArea();
        System.out.println("The Area of rectangle of length \""
                +r.length+"\" and breadth \""+r.breadth+"\" is \""+r.area+"\"");
    }
}