Inherit01.java

class A {
    private int x;

    public A(int x) {
        this.x = x;
        System.out.println("A");
    }

    public void foo() {
        System.out.println(x);
    }
}

class B extends A {
    public B(int x) {
        super(x);
        System.out.println("B");
    }
}

public class Inherit01 {
    public static void main(String[] args) {
        new B(3).foo();
        System.out.println("6210110242");
    }
}