Question

好吧，我正在点击游戏和Blah Blah Blah ...点是，我无法让JLabel更新......我很困惑......看到我以前做过这件事。 ..这是我的代码。

            import javax.swing.*;
            import java.awt.*;
            import java.awt.event.*;
            public class ClickingGame extends JPanel implements ActionListener {
      private static final long serialVersionUID = 1L;

    static JFrame frame;
    static JButton startbutton, clickingbutton, timerstop;
    static JLabel timelabel, scorelabel;
    static int time = 0;
    static JTextField entertime;
    static Timer clock;
    static Timer countdown;

public ClickingGame() {
    setLayout(new GridLayout(3, 2, 5, 5));

    startbutton = new JButton("Start CountDown");

    timelabel = new JLabel("Time Left = NULL", SwingConstants.CENTER);

    entertime = new JTextField();

    clickingbutton = new JButton("Click Here!");

    scorelabel = new JLabel("Score = NULL", SwingConstants.CENTER);

    timerstop = new JButton("Stop Timer!");

    clock = new Timer(1000, this);

    countdown = new Timer(1000, this);


    add(entertime);
    add(startbutton);
    add(timelabel);
    add(scorelabel);
    add(clickingbutton);
    add(timerstop);
    clickingbutton.setEnabled(false);
    timerstop.setEnabled(false);
    startbutton.addActionListener(this);

}

public static void openGUI() {
    frame = new JFrame("Clicking Game");
    ClickingGame contentpane = new ClickingGame();
    frame.setContentPane(contentpane);
    frame.pack();
    frame.setVisible(true);


}

public void actionPerformed(ActionEvent e) {

    if (e.getSource() == startbutton) {
        startbutton.setEnabled(false);
        clickingbutton.setEnabled(true);
    }

    if (e.getSource() == clickingbutton) {
        int score = 0;
        score++;
        scorelabel.setText("Score = "+score);
        scorelabel.repaint();
    }


}

 }

正如你所看到的，我使用了'setText'方法，但它还没有工作...... :(有人可以帮忙吗？

Answer 1

您永远不会将ActionListener添加到clickButton。除非有听众，否则它不起作用吧？

所以：

public ClickingGame() {
  setLayout(new GridLayout(3, 2, 5, 5));
  startbutton = new JButton("Start CountDown");
  timelabel = new JLabel("Time Left = NULL", SwingConstants.CENTER);
  entertime = new JTextField();
  clickingbutton = new JButton("Click Here!");
  scorelabel = new JLabel("Score = NULL", SwingConstants.CENTER);
  timerstop = new JButton("Stop Timer!");
  clock = new Timer(1000, this);
  countdown = new Timer(1000, this);
  add(entertime);
  add(startbutton);
  add(timelabel);
  add(scorelabel);
  add(clickingbutton);
  add(timerstop);
  clickingbutton.setEnabled(false);
  timerstop.setEnabled(false);
  startbutton.addActionListener(this);
  clickingbutton.addActionListener(this);  // ** add this!
}

此外，请改进您的代码格式，特别是如果您要请志愿者帮助您。

Answer 2

您尚未将动作侦听器添加到单击按钮。

Answer 3

在actionPerformed方法中，你需要让局部变量“得分”为一个字段（全局），因此它实际上可以在调用之间增长：

int score; // Our field here :)

public void actionPerformed(ActionEvent e) {

    if (e.getSource() == startbutton) {
        score = 0; //Start with 0
        startbutton.setEnabled(false);
        clickingbutton.setEnabled(true);
    }

    if (e.getSource() == clickingbutton) {
        score++; //Add one for each click
        scorelabel.setText("Score = "+score);
        scorelabel.repaint();
    }
}

在GUI中更新JLabel（setText不工作）

3 个答案: