如何使 JButton 在按下时执行新操作

Question

我想创建一个 rock/paper/scissors 游戏并添加功能来实现一个按钮，让用户可以选择重玩游戏而无需重新运行程序，但是当我按下"Do it again"按钮电脑的随机选择总是一样的，如何做到它从数组中选择一个新的随机字符串。

JButton button1 = new JButton("The choice");
JButton button2 = new JButton("Do it again");
JTextField tekst1 = new JTextField(20);
Container c = getContentPane();
c.setLayout(new FlowLayout());
c.add(tekst1);
c.add(button1);
c.add(button2);

button2.addActionListener(new ActionListener() {

    public void actionPerformed(ActionEvent evt) {
        if (!hasBeenClicked) {
            button1.addActionListener(new ActionListener() {
                String[] arr={"rock", "paper", "scissors"};
                Random r=new Random();
                int randomNumber=r.nextInt(arr.length);

                public void actionPerformed(ActionEvent evt) {
                    tekst1.setText(arr[randomNumber]);
                }
            });
        } else {
            tekst1.setText("");
        }
        hasBeenClicked = ! hasBeenClicked;
    }
});

Answer 1

将 int randomNumber=r.nextInt(arr.length); 移至 actionPerformed

Answer 2

发生这种情况是因为您在单击事件之外生成了一个随机数。将其移动到下面几行的方法中：

button1.addActionListener(new ActionListener() {
    String[] arr={"rock", "paper", "scissors"};
    Random r=new Random();

    public void actionPerformed(ActionEvent evt) {
        int randomNumber=r.nextInt(arr.length);
        tekst1.setText(arr[randomNumber]);
    }
});

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