Single Level Inheritance

Single Level Inheritance

class Base {
    int a;
    Base() {
        a = 0;
    }
    Base(int x) {
        a = x;
    }
    void display() {
        System.out.println("\na = " + a);
    }
}

class Derived extends Base {
    int b;
    Derived() {
        super(); // Calling Base class Default Constuctor
        b = 0;
    }
    Derived(int x, int y) {
        super(x); // Calling Base class Parameterised Constructor
        b = y;
    }
    void display() {
        super.display(); // Calling Base class Display method
        System.out.println("b = " + b);
    }
}

class SingleLevelInheritance {
    public static void main(String[] args) {
        Derived d, d1; // Declaring Variables
        d = new Derived();
        d.display();
        d1 = new Derived(10, 20);
        d1.display();
    }
}

OUTPUT::

a = 0
b = 0

a = 10
b = 20