Java 使用另一个对象（线程）的数据重新绘制JPanel

我面临一个问题，JPanel从一个对象获取数据，该对象有一个更新其状态变量的周期

场景如下：一个JFrame调用对象的一个方法，该方法创建第二个JFrame，然后更新一个状态变量。第二个JFrame访问该变量，并应显示在JPanel中，但否，GUI挂起

我将问题简化为一个具有相同行为的示例，这样就可以很容易地进行测试

谢谢你的帮助，谢谢

Starter.java

public class Starter extends JFrame {

    JButton button = new JButton("Fight!");

    public Starter() {

        button.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent arg0) {
                OneClass.getInstance().start();
            }
        });
        add(button);
    }

    public static void main(String[] args) {

        Starter frame = new Starter();

        frame.setTitle("Test");
        frame.setSize(400, 300);
        frame.setVisible(true);

    }
}

public class OneClass {

    private OneFrame frame;
    private int count;
    private static OneClass instance;

    private OneClass() {
    }

    public static OneClass getInstance() {
        if (instance == null)
            instance = new OneClass();

        return instance;
    }

    public void start() {
        frame = new OneFrame();
        frame.setSize(400, 300);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);

        while (true)
        {
            count++;
            System.out.println(count);

            frame.repaint();            
        }
    }

    public int getCount() {
        return count;
    }
}

public class OneFrame extends JFrame {

    private OnePanel panel = new OnePanel();

    public OneFrame() {
        setTitle("Test frame");
        setContentPane(panel);
        setResizable(false);
    }
}

public class OnePanel extends JPanel {

    public void paintComponent(Graphics g) {
        super.paintComponent(g);

        Font ft = new Font("Times New Roman", Font.PLAIN, 20);
        g.setFont(ft);

        g.drawString("Count = " + OneClass.getInstance().getCount(), 20, 20);
    }
}

OneClass.java

public class Starter extends JFrame {

    JButton button = new JButton("Fight!");

    public Starter() {

        button.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent arg0) {
                OneClass.getInstance().start();
            }
        });
        add(button);
    }

    public static void main(String[] args) {

        Starter frame = new Starter();

        frame.setTitle("Test");
        frame.setSize(400, 300);
        frame.setVisible(true);

    }
}

public class OneClass {

    private OneFrame frame;
    private int count;
    private static OneClass instance;

    private OneClass() {
    }

    public static OneClass getInstance() {
        if (instance == null)
            instance = new OneClass();

        return instance;
    }

    public void start() {
        frame = new OneFrame();
        frame.setSize(400, 300);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);

        while (true)
        {
            count++;
            System.out.println(count);

            frame.repaint();            
        }
    }

    public int getCount() {
        return count;
    }
}

public class OneFrame extends JFrame {

    private OnePanel panel = new OnePanel();

    public OneFrame() {
        setTitle("Test frame");
        setContentPane(panel);
        setResizable(false);
    }
}

public class OnePanel extends JPanel {

    public void paintComponent(Graphics g) {
        super.paintComponent(g);

        Font ft = new Font("Times New Roman", Font.PLAIN, 20);
        g.setFont(ft);

        g.drawString("Count = " + OneClass.getInstance().getCount(), 20, 20);
    }
}

OneFrame.java

public class Starter extends JFrame {

    JButton button = new JButton("Fight!");

    public Starter() {

        button.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent arg0) {
                OneClass.getInstance().start();
            }
        });
        add(button);
    }

    public static void main(String[] args) {

        Starter frame = new Starter();

        frame.setTitle("Test");
        frame.setSize(400, 300);
        frame.setVisible(true);

    }
}

public class OneClass {

    private OneFrame frame;
    private int count;
    private static OneClass instance;

    private OneClass() {
    }

    public static OneClass getInstance() {
        if (instance == null)
            instance = new OneClass();

        return instance;
    }

    public void start() {
        frame = new OneFrame();
        frame.setSize(400, 300);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);

        while (true)
        {
            count++;
            System.out.println(count);

            frame.repaint();            
        }
    }

    public int getCount() {
        return count;
    }
}

public class OneFrame extends JFrame {

    private OnePanel panel = new OnePanel();

    public OneFrame() {
        setTitle("Test frame");
        setContentPane(panel);
        setResizable(false);
    }
}

public class OnePanel extends JPanel {

    public void paintComponent(Graphics g) {
        super.paintComponent(g);

        Font ft = new Font("Times New Roman", Font.PLAIN, 20);
        g.setFont(ft);

        g.drawString("Count = " + OneClass.getInstance().getCount(), 20, 20);
    }
}

OnePanel.java

public class Starter extends JFrame {

    JButton button = new JButton("Fight!");

    public Starter() {

        button.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent arg0) {
                OneClass.getInstance().start();
            }
        });
        add(button);
    }

    public static void main(String[] args) {

        Starter frame = new Starter();

        frame.setTitle("Test");
        frame.setSize(400, 300);
        frame.setVisible(true);

    }
}

public class OneClass {

    private OneFrame frame;
    private int count;
    private static OneClass instance;

    private OneClass() {
    }

    public static OneClass getInstance() {
        if (instance == null)
            instance = new OneClass();

        return instance;
    }

    public void start() {
        frame = new OneFrame();
        frame.setSize(400, 300);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);

        while (true)
        {
            count++;
            System.out.println(count);

            frame.repaint();            
        }
    }

    public int getCount() {
        return count;
    }
}

public class OneFrame extends JFrame {

    private OnePanel panel = new OnePanel();

    public OneFrame() {
        setTitle("Test frame");
        setContentPane(panel);
        setResizable(false);
    }
}

public class OnePanel extends JPanel {

    public void paintComponent(Graphics g) {
        super.paintComponent(g);

        Font ft = new Font("Times New Roman", Font.PLAIN, 20);
        g.setFont(ft);

        g.drawString("Count = " + OneClass.getInstance().getCount(), 20, 20);
    }
}

试试这个：

  public Starter() {

    button.addActionListener(new ActionListener() {
      @Override
      public void actionPerformed(ActionEvent arg0) {
        new Thread() {
          public void run() {
            OneClass.getInstance().start();
          }
        }.start();
      }
    });
    add(button);
  }

由于循环与GUI在同一线程中运行，因此一旦到达无限循环，它将挂起

如果您在另一个线程中运行无限循环，那么GUI将不受该循环的影响

这可能不是最好的线程实现

请看并发教程：

---

现在，由于您使用的是类似单例的类，如果在线程之前调用getInstance，那么它可能仍然挂起。

无限循环和GUI都在同一线程中运行，您必须创建另一个运行无限循环逻辑的线程。这就是它挂起来的原因。是的。。。这就是我想的，如果你有我的想法，我会试试看！我在做类似的循环。