我正在写一个石头布剪刀图形用户界面应用程序，在我的一个 JPanel s、 我有一个 JLabel . 这个 JLabel 应该说石头一秒钟，然后是布一秒钟，然后是剪刀一秒钟。到目前为止只显示了 JLabel 最后的拍摄文本。我似乎不明白为什么。有人能帮忙吗？
代码：

import javax.swing.*;
import java.awt.*;

class RockPaperScissorsShoot {
    public JFrame shootFrame;
    JPanel shootPanel;
    JLabel shootLabel;
    int flagThing = 0;

    public RockPaperScissorsShoot(Window gameWindow) {
        shootFrame = new JFrame();
        shootFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        shootFrame.setSize(250, 150);

        shootPanel = new JPanel(new GridLayout(1, 1));
        shootFrame.add(shootPanel);

        shootLabel = new JLabel();
        shootPanel.add(shootLabel);

        shootFrame.setVisible(true);

        shootFrame.setTitle("Rock!"); // the title changes
        shootLabel.setText("Rock!"); // but the JLabel text does not

        waitForMilSecs(1000);

        shootFrame.setTitle("Paper!");
        shootLabel.setText("Paper!");

        waitForMilSecs(1000);

        shootFrame.setTitle("Scissors!");
        shootLabel.setText("Scissors!");

        waitForMilSecs(1000);

        shootFrame.setTitle("Shoot!");
        shootLabel.setText("Shoot!"); //Except here, right here, the text shows up
    }

    public static void waitForMilSecs(long ms) {
        long checkMS = System.currentTimeMillis() + ms;
        while (System.currentTimeMillis() <= checkMS) {
            System.out.println("Not yet!");
        }
        System.out.println("NOW!");
    }
}

编辑：我尝试添加一个 SwingWorker 在单独的线程中处理等待。我还有一个冰冻的gui。代码：

import java.awt.*;
import java.util.concurrent.ExecutionException;
import javax.swing.*;
//import javax.swing.event.ChangeEvent;
import javax.swing.SwingWorker.StateValue;

class RockPaperScissorsShoot {
    public JFrame shootFrame;
    JPanel shootPanel;
    JLabel shootLabel;
    int flagThing = 0;

    public RockPaperScissorsShoot(Window gameWindow) {
        shootFrame = new JFrame();
        shootFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        shootFrame.setSize(250, 150);

        shootPanel = new JPanel(new GridLayout(1, 1));
        shootFrame.add(shootPanel);

        shootLabel = new JLabel();
        shootPanel.add(shootLabel);

        shootFrame.setVisible(true);

        changeText(false, "Rock!", shootLabel, shootFrame, 1);
        changeText(true, "Paper!", shootLabel, shootFrame, 1);
        changeText(true, "Scissors", shootLabel, shootFrame, 1);
        changeText(true, "Shoot!", shootLabel, shootFrame, 1);
    }

    public static void changeText(boolean wait, String text, JLabel shootLabel, JFrame shootFrame, long secondsToWait) {
        while (wait) {
            wait = waiter(secondsToWait * 1000);
        }
        shootFrame.setTitle(text);
        shootLabel.setText(text);
    }

    private static boolean waiter(long ms) {
        boolean keepGoing = false;
        SwingWorker sw1 = new SwingWorker() {

            @Override
            protected Boolean doInBackground() throws Exception {
                Thread.sleep(ms);
                // String res = "Finished Execution";
                return true;
            }

            @Override
            protected void done() {
                try {
                    System.out.println(get().toString());
                } catch (InterruptedException e) {
                    e.printStackTrace();
                } catch (ExecutionException e) {
                    // Auto-generated catch block
                    e.printStackTrace();
                }
            }
        };

        // executes the swingworker on worker thread
        sw1.execute();

        while (sw1.getState() != StateValue.DONE) {
            System.out.println("Not done (debug)");
        }
        System.out.println("Done!");
        return false;
    }

    public static void waitForMilSecs(long ms) {
        long checkMS = System.currentTimeMillis() + ms;
        while (System.currentTimeMillis() <= checkMS) {
            System.out.println("Not yet!");
        }
        System.out.println("NOW!");
    }

    public static void wait(int ms) {
        try {
            Thread.sleep(ms);
        } catch (InterruptedException e) {
            System.out.println("Error waiting, cannot wait lol");
        }
    }
}

有人能解释一下为什么我的gui还冻着吗？