我的代码需要停止弹出JFrame

Question

在我的代码中，当球反弹到墙壁上时，弹出的Jframe会继续弹出。我希望球碰到墙壁时不再弹出。只有正确回答了jframe提供的问题中的答案，球才会继续。

我尝试在QandA.hor中使用循环，以便它只会在输入答案之前调用保持循环。

以下是一些代码：

public Random r = new Random();
public menu m;

public String[] questions= {"what is 1+1?","What is the product of 3 and 6?","what is the difference between 300 and 150?",
"how many 5 apples in a cartel of 50 apples?"};
public String[] answers = {"2","18","150","10"};


public Ball b;
public JTextField qna;
public int num = r.nextInt(3);
public void hor () { 
    JFrame f = new JFrame();
    f.setSize(600, 400);
    f.setVisible(true);
    f.setLocationRelativeTo(null);

    JLabel qn = new JLabel(questions[num]);
    qn.setBounds(100,50,400,100);
    f.add(qn);

    JTextField qna = new JTextField("");
    qna.setBounds(100,150, 200, 50);
    f.add(qna);
    qna.addKeyListener(this);
    }

    public void ver () {

        JFrame f = new JFrame();
        f.setSize(600,400);
        f.setVisible(true);
        f.setLocationRelativeTo(null);
        int num = r.nextInt(3);

        JLabel q1 = new JLabel(questions[num]);
        q1.setBounds(100,50,400,100);
        f.add(q1);

        JTextField qna = new JTextField("");
        qna.setBounds(100,150, 200, 50);
        f.add(qna);
        qna.addKeyListener(this);

}

有公共无效键已按下

// TODO Auto-generated method stub

int key = e.getKeyCode();
String ans1 = qna.getText();

if(key == KeyEvent.VK_ENTER) {

    if (ans1.equalsIgnoreCase(answers[num])) {
        Ball.setValue = true;

        }

    }
}

其中Ball.java

    public int x,y; 
    public double velX=2, velY=2;
    public boolean bw = true;
    public bounce anim;
    public Ball ball;
    QandA qna = new QandA();

    Random r = new Random();

    Timer t = new Timer(10, this);

    public Ball(bounce anim) {
        x = anim.r.nextInt(940); 
        y = anim.r.nextInt(420);
        this.anim = anim;
    }
    public void move() {
        if (x<0 || x>940) {
            velX = -velX;
            stopper(x, 0);
        }
        if (y<0||y>420) {
            velY = -velY;
            stopper(0, y);
        }
        x += velX;
        y += velY;

    }
    public void stopper(int x, int y) {
        if (x<0 || x>940) {
            t.stop();
            qna.hor();
        }
        if (y<0||y>420) {
            t.stop();
            qna.ver();
        }
    }


    public void paint (Graphics g) {
        g.fillOval(x, y, 40, 40);
    }

    @Override
    public void actionPerformed(ActionEvent arg0) {
        // TODO Auto-generated method stub

    }
    public void stopper(boolean b) {
        // TODO Auto-generated method stub

    }

}

想要一直阻止框架弹出。我还希望从弹出的JFrame中显示问题。