package polymorphie;

public class A {

    int val = 0;

    A() {
        this(42);
    }

    A(int v) {
        val = v;
    }

    public String toString() {
        return String.valueOf(val);
    }

    public static void main(String[] args) {

    }

}


package polymorphie;

public class B extends A {

    B() {
        super();
        val = 9;
    }

    public String toString(int val) {
        return String.valueOf(val);
    }

    public static void main(String[] args) {

        A a1 = new A();
        A a2 = new A(3);
        A a3 = new A();
        B b1 = new B();

        System.out.println(a1);
        System.out.println(a2);
        System.out.println(a3);
        System.out.println(b1);
    }

}