Program to demonstrate Single inheritance

//Single inheritance

//create a superclass
class A
{
    int a1;            //public by default
    protected int a2;   //protected to A
    void showa1a2()
    {
            System.out.println("a1 : "+a1+", a2 : "+a2);
    }

}

//create a sunclass by extending A
class B extends A
{
    int b;
    void showb()
    {
        System.out.println("b : "+b);
    }
    void sum()
    {
        System.out.println("a1+a2+b : "+(a1+a2+b));
    }

}

class SimpleInheritance2
{
    public static void main(String args [])
    {

        B subob=new B();


        subob.a1=10;
        subob.a2=20;
        subob.b=30;
        subob.showa1a2();
        subob.showb();
        subob.sum();
    }
}

/*output
a1 : 10, a2 : 20
b : 30
a1+a2+b : 60
*/