public class Main {
    public static void main(String[] args) {        
        RichJack jack = new RichJack();
        jack.showYourWallet();
    }
}

class Jack {
    Jack() {
        this.sayHello();
    }
    
    public void sayHello() {
        System.out.println("I'm Jack!");
    }
}

class RichJack extends Jack {
    private int money = 0;

    public RichJack() {
        money += 100;
    };
    
    public void sayHello() {
        money += 1000000000;   // one billion
        System.out.println("I'm rich Jack!");
    }
    
    public void showYourWallet() {
        System.out.println("I have quite some money, about $" + money);
    };
}