java jbutton'；s鼠标侦听器包含if/else循环阻塞的jvm？

在执行所有建议后，按钮现在不会冻结程序，而只是停止对鼠标单击的响应。按下按钮后，除“返回”按钮外，其他按钮均不起作用。以前，甚至“返回”按钮都不起作用。 以下是完整且更新的代码：

package models;

// Various imports

@SuppressWarnings("unused") 
public class AskTheAdmiralFrame extends JFrame {

/**
 * Set the serial number and create components
 */
private static final long serialVersionUID = 4057461973369708227L;
private JPanel panel;
/**
 * @wbp.nonvisual location=111,111
 */
private final JLabel textArea = new JLabel("I am Admiral Ting of the Chinese Navy.");
private final JLabel textArea2 = new JLabel("Welcome to the Battle of Yalu River interactive Historask tour.");
private final JLabel textArea3 = new JLabel("Please ask me any questions you have about the Battle of Yalu River.");
private final JLabel textArea4 = new JLabel();
private final JLabel textArea5 = new JLabel();

private final JButton button1 = new JButton("What is the Battle of Yalu River?");
private final JButton button2 = new JButton("Where was the Battle of Yalu River?(duh)");
private final JButton button3 = new JButton("When was the Battle of Yalu River?");
private final JButton button4 = new JButton("More details please.");
private final JButton button5 = new JButton("I think I know enought already. Ask me some questions");
private final JButton button6 = new JButton("More details please.");
private final JButton button7 = new JButton("More details please.");
private final JButton button8 = new JButton("More details please.");
private final JButton button9 = new JButton("What happened to the Chinese?");
private final JButton button10 = new JButton("What happened next?");
private final JButton button11 = new JButton("What happened to the Japanese?");
private final JButton button12 = new JButton("Tell me about more of the Chinese deaths.");
private final JButton button13 = new JButton("Tell me more about the admirals.");
private final JButton button14 = new JButton("Tell me more about the Chinese ships");
private final JButton button15 = new JButton("Tell me more about the Japanese ships");
private final JButton button16 = new JButton("Then why did the Chinese fleet lose even though they were so much more advanced?");
private final JButton button17 = new JButton("Go Back");

private final JTextField textField = new JTextField();
private final JTextField textField2 = new JTextField();
private final JTextField textField3 = new JTextField();
private final JTextField textField4 = new JTextField();
private final JTextField textField5 = new JTextField();

private final JLabel label = new JLabel("How many ships were destroyed in the battle?");
private final JLabel label2 = new JLabel("Which year did the battle take place in?");
private final JLabel label3 = new JLabel("Where was the battle?");
private final JLabel label4 = new JLabel("Who was the Japanese Admiral that visited the Beiyng Fleet?");
private final JLabel label5 = new JLabel("What time was the Japanese battle flag raised?");

private int score = 0;

private String scr = Integer.toString(score);

private String ans = textField.getText();
private String ans2 = textField2.getText();
private String ans3 = textField3.getText();
private String ans4 = textField4.getText();
private String ans5 = textField5.getText();

private final JLabel labela = new JLabel("Congratualtions! You have completed the quiz:) You have scored ");
private final JLabel labelb = new JLabel(scr);
private final JLabel labelc = new JLabel();

private final ImageIcon imgicn = new ImageIcon("resources/yalubg.jpg");
private final Image img = imgicn.getImage();
private final Image imgu = img.getScaledInstance(700, 500, 0);
JLabel bg = new JLabel(imgicn);

private final ImageIcon imgicno = new ImageIcon("resources/hicon.icns");
Image imgee = imgicno.getImage();

private final ImageIcon ad = new ImageIcon("resources/Di_Ruchang.jpg");
JLabel at = new JLabel(ad);
private final JLabel adText = new JLabel("Admiral Ting Juchang");

private final ImageIcon al = new ImageIcon("resources/al.jpg");
JLabel a = new JLabel(al);
private final JLabel alText = new JLabel("Admiral Liu Buchan");

private final ImageIcon is = new ImageIcon("resources/is.jpg");
JLabel ai = new JLabel(is);
private final JLabel isText = new JLabel("Admiral Sukeyuki Itoh");

private final ImageIcon tk = new ImageIcon("resources/tk.jpg");
JLabel bt = new JLabel(tk);
private final JLabel tkText = new JLabel("Admiral Tsuboi Togo");



public void addAll(){
    if(panel.getComponents() != null){
        panel.add(a);
        panel.add(at);
        panel.add(textArea);
        panel.add(textArea2);
        panel.add(textArea3);
        panel.add(textArea4);
        panel.add(textArea5);
        panel.add(button1);
        panel.add(button2);
        panel.add(button3);
        panel.add(button5);
    }
}

/**
 * Create the frame.
 */
public AskTheAdmiralFrame() {

    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setIconImage(imgee);
    setTitle("Ask Admiral Ting");
    setSize(1400, 1000);
    panel = new JPanel();
    setContentPane(panel);
    panel.setLayout(new FlowLayout(FlowLayout.CENTER, 5, 5));
    panel.add(textArea);
    panel.add(textArea2);
    panel.add(textArea3);
    panel.add(textArea4);
    panel.add(textArea5);
    textArea.setSize(textArea.getPreferredSize());
/**
 * Set buttons' responses   
 */
    button17.addMouseListener(new MouseAdapter() {
        @Override
        public void mousePressed(MouseEvent paramMouseEvent) {
            dispose();
            new HistoraskMenu();
        }
    });
    panel.add(button17);

    button1.setHorizontalAlignment(SwingConstants.LEFT);
    button1.addMouseListener(new MouseAdapter() {
        @Override
        public void mousePressed(MouseEvent paramMouseEvent) {
            textArea.setText("The Battle of Yalu River is a battle that took place");
            textArea2.setText("between the Chinese Beiyang Fleet ");
            textArea3.setText("and the Imperial Japanese Navy.");
            textArea4.setText("Interesting?");
            textArea5.setText("");
            panel.remove(button1);
            panel.add(button5);
            panel.add(button4);
            addAll();
        }
    });
    getContentPane().add(button1);

    button2.addMouseListener(new MouseAdapter() {
        @Override
        public void mousePressed(MouseEvent paramMouseEvent) {
            textArea.setText("Actually, the Battle of Yalu River");
            textArea2.setText("did not take place in Yalu River, ");
            textArea3.setText("but in the Yellow Sea off the mouth of the Yalu River.");
            textArea4.setText("");
            textArea5.setText("");
            panel.remove(button2);
            panel.add(button5);
            panel.add(button6);
            addAll();
        }
    });
    getContentPane().add(button2);

    button3.addMouseListener(new MouseAdapter() {
        @Override
        public void mousePressed(MouseEvent paramMouseEvent) {
            textArea.setText("The Battle took place on the 17 of September 1894.");
            textArea2.setText("It was during the first Sino-Japanese War.");
            textArea3.setText("Sino- is a prefix meaning Chinese or China.");
            textArea4.setText("");
            textArea5.setText("");
            panel.remove(button3);
            panel.add(button5);
            panel.add(button7);
            addAll();
        }
    });
    getContentPane().add(button3);

    button4.addMouseListener(new MouseAdapter() {
        @Override
        public void mousePressed(MouseEvent paramMouseEvent) {
            textArea.setText("The Battle of Yalu River took place in the Yellow Sea, off the mouth of the Yalu River.");
            textArea2.setText("The two fleets, the Imperial Japanese Navy and the Chinese Beiyang Fleet, met at 11.40 am in the morning.");
            textArea3.setText("Each fleet began slowely advancing towards each other.");
            textArea4.setText("It was a matter of nerves. Each fleet was out of firing range of the other");
            textArea5.setText("Neither side wanted to fire too early and waste bullets, but neither did either want to shoot too late and be caught by the other fleet.");
            panel.remove(button4);
            panel.add(button10);
            panel.add(button14);
            panel.add(button15);
            addAll();
        }
    });

    button5.addMouseListener(new MouseAdapter() {
        @Override
        public void mousePressed(MouseEvent paramMouseEvent) {

            panel.add(textField);

            panel.add(label);

            panel.remove(textArea);
            panel.remove(textArea2);
            panel.remove(textArea3);
            panel.remove(textArea4);
            panel.remove(textArea5);

            panel.remove(button1);
            panel.remove(button2);
            panel.remove(button3);
            panel.remove(button4);
            panel.remove(button5);
            panel.remove(button6);
            panel.remove(button7);
            panel.remove(button8);
            panel.remove(button9);
            panel.remove(button10);
            panel.remove(button11);
            panel.remove(button12);
            panel.remove(button13);
            panel.remove(button14);
            panel.remove(button15);
            panel.remove(button16);

            if(ans.equals("5")){
                panel.remove(label);
                panel.remove(textField);
                panel.add(label2);
                panel.add(textField2);
                score++;
            } else { 
                panel.remove(label);
                panel.remove(textField);
                score--;
                panel.add(label2);
                panel.add(textField2);
            }

            if(ans2.equals("1894")){
                panel.remove(label2);
                panel.remove(textField2);
                panel.add(label3);
                panel.add(textField3);
                score++;
            } else {
                panel.remove(label2);
                panel.remove(textField2);
                score --;
                panel.add(label3);
                panel.add(textField3);
            }

            if(ans3.equals("yellow sea")||
                ans3 .equals("korea bay")||
                ans3.equals("The Yellow Sea")||
                ans3.equals("Korea Bay")){
                panel.remove(label3);
                panel.remove(textField3);
                panel.add(label4);
                panel.add(textField4);
                score++;
            } else {
                panel.remove(label3);
                panel.remove(textField3);
                score--;
                panel.add(label4);
                panel.add(textField4);
            }

            if(ans4.equals("Admiral Togo")
               ||ans4.equals("admiral togo")) {
                panel.remove(label4);
                panel.remove(textField4);
                panel.add(label5);
                panel.add(textField5);
                score++;
            } else {
                panel.remove(label4);
                panel.remove(textField4);
                score--;
                panel.add(label5);
                panel.add(textField5);
            }

            if(ans5.equals("12.03")
               ||ans5.equals("12.03pm")
               ||ans5.equals("12.03.p.m.")
               ||ans5.equals("12,03.pm")) {
                panel.remove(label5);
                panel.remove(textField5);
                panel.add(labela);
                panel.add(labelb);
                switch(score){
                case -5:
                    labelc.setText("points! You don't know much on the Battle of Yalu do you? "
                            + "Try learning a bit more before trying the quiz again.:(");
                    break;
                case -4:
                    labelc.setText("points! You don't know much on the Battle of Yalu do you? "
                            + "Try learning a bit more before trying the quiz again.:(");
                    break;
                case -3:
                    labelc.setText("points! You don't know much on the Battle of Yalu do you? "
                            + "Try learning a bit more before trying the quiz again.:(");
                    break;
                case -2:
                    labelc.setText("points! You don't know much on the Battle of Yalu do you? "
                            + "Try learning a bit more before trying the quiz again.:(");
                    break;
                case -1:
                    labelc.setText("points! You don't know much on the Battle of Yalu do you? "
                            + "Try learning a bit more before trying the quiz again.:(");
                    break;
                case 1:
                    labelc.setText("points! Your knowledge on the Battle of Yalu needs improvement.:(");
                    break;
                case 2:
                    labelc.setText("points! Your knowledge on the Battle of Yalu is ok, "
                            + "but you should try asking Admiral Ting a bit more"); 
                    break;
                case 3:
                    labelc.setText("points! Your knowledge on the Battle of Yalu is satisfactory. Good job:)"); 
                    break;
                case 4:
                    labelc.setText("points! Your knowledge on the Battle of Yalu is amazing!.:(");  
                    break;
                case 5:
                    labelc.setText("points! You have a perfect score!!!!:):):) Are you sure you didin't cheat?");
                    break;
                }
                panel.add(labelc);
            }
        }
    });
    panel.add(button5);

    button6.addMouseListener(new MouseAdapter() {
        @Override
        public void mousePressed(MouseEvent paramMouseEvent){
            textArea.setText("The Battle took place in the Yellow Sea.");
            textArea2.setText("To be more specific, it took place in Korea Bay, ");
            textArea3.setText("which is in the northern part of the Yellow Sea");
            textArea4.setText("The Chinese were delivering reinforecements to Pyongyang ");
            textArea5.setText("and the attack was actually unprovoked.");
            addAll();
            panel.remove(button6);
        }
    });

    button7.addMouseListener(new MouseAdapter() {
        @Override
        public void mousePressed(MouseEvent paramMouseEvent){
            textArea.setText("The Battle of Yalu River was the largest naval battle ");
            textArea2.setText("of the first Sino-Japanese War. ");
            textArea3.setText("The Chinese and Japanese fleets spotted each other at 11.40am");
            textArea4.setText("The Japanese raised their battleflag at 12.03pm to signal preparation for battle.");
            textArea5.setText("And the Chinese attacked them at 12.45pm, although they were still 6km away.");
            addAll();
            panel.remove(button7);
        }
    });

    button8.addMouseListener(new MouseAdapter() {
        @Override
        public void mousePressed(MouseEvent paramMouseEvent){
            textArea.setText("Also, the Chinese soldiers hadn't been trained enough in gunnery.");
            textArea2.setText("It was also believed that there was a corrput saboteur within their ranks.");
            textArea3.setText("Because many of the shells had ");
            textArea4.setText("been filled with cement or porcelain.");
            textArea5.setText("Some were also of the wrong caliber and thus could not be fired.");
            addAll();
            panel.remove(button8);
        }
    });

    button9.addMouseListener(new MouseAdapter() {
        @Override
        public void mousePressed(MouseEvent paramMouseEvent){
            textArea.setText("The Chinese lost the brutal navy battle. ");
            textArea2.setText("Teir troops suffered many losses. In total, they loss");
            textArea3.setText("700 men to death and 300 to injury.");
            textArea4.setText("Five of their twelve ships were sunk.");
            textArea5.setText("All of this happened inthe duration of 5 hours.");
            panel.remove(button9);
            panel.add(button11);
            panel.add(button12);
            addAll();
        }
    });
    button10.addMouseListener(new MouseAdapter() {
        @Override
        public void mousePressed(MouseEvent paramMouseEvent){
            textArea.setText("The Chinese Fleet fired first, ");
            textArea2.setText("although the Japanese ships were still 6km away. ");
            textArea3.setText("The Chinese fired too early");
            textArea4.setText("and the Japanese saw the fire and smoke from the Chinese shells");
            textArea5.setText("that fell into the water in front of them.");
            panel.remove(button10);
            panel.add(button11);
            addAll();
        }
    });
    button11.addMouseListener(new MouseAdapter() {
        @Override
        public void mousePressed(MouseEvent paramMouseEvent){
            textArea.setText("Surprisingly, the Japanese won the short and gruesome battle.");
            textArea2.setText("Not a single of their ships were sunken and only ninety");
            textArea3.setText("of the Japanese troops were killed. Only 200 were wounded. ");
            textArea4.setText("Not a single of their ships sank. However, the crew of Matsushima were ");
            textArea5.setText("all burnt as a Chinese shell hit an ammuniton pile, causing it to burst with great heat.");
            panel.remove(button11);
            panel.add(button12);
            panel.add(button13);
            addAll();
        }
    });
    button12.addMouseListener(new MouseAdapter() {
        @Override
        public void mousePressed(MouseEvent paramMouseEvent){
            textArea.setText("The ship Lai-Yuen burnt with such heat that it glowed nearly ");
            textArea2.setText("white-hot and many of the crew burned to death. ");
            textArea3.setText("When the ship King-Yuen was hit, it started rolling from side to side until it fell over and didn't roll back. ");
            textArea4.setText("One of the two battleships, Ting, was hit 300 times by the Japanese! It's size must have it an easy target. ");
            textArea5.setText("The captain of Tsi-Yuen was decapitated for fleeing the battle and ramming another Chinese ship in the process");
            panel.remove(button12);
            panel.add(button13);
            addAll();
        }
    });
    button13.addMouseListener(new MouseAdapter() {
        @Override
        public void mousePressed(MouseEvent paramMouseEvent){
            textArea.setText("The Chinese admirals were Admiral Ting and Admiral Liu.");
            textArea2.setText("The Japanese Admirals were Admiral Togo and Admiral Itoh");
            textArea3.setText("Interestingly, both Chinese admirals commited suicide by opium to uphold ");
            textArea4.setText("their honour, during the Sino-Japanese War. This refusal to give in earned ");
            textArea5.setText("them much respect from many Japanese and Chinese individuals.");
            panel.remove(button13);
            addAll();
        }
    });
    button14.addMouseListener(new MouseAdapter() {
        @Override
        public void mousePressed(MouseEvent paramMouseEvent){
            textArea.setText("The Chinese fleet had 12 ships. Their ships were generally larger than the Japanese ones, ");
            textArea2.setText("and they had two huge battleships, 定远 and 鎮遠, bigger than anything the Japanese fleet had.");
            textArea3.setText("The other ten ships were a comibnation of cruisers, torpedo boats and corvet.");
            textArea4.setText("They were also equipped with ten to eight inch gun mounts. On top of that, ");
            textArea5.setText("many skilled military advisers, like Major Constantin von Hanneken, W. F. Tyler and Philo McGiffen");
            panel.add(button16);
            panel.remove(button14);
            addAll();
        }
    });
    button15.addMouseListener(new MouseAdapter() {
        @Override
        public void mousePressed(MouseEvent paramMouseEvent){
            textArea.setText("The Japanese fleet had 12 ships.");
            textArea2.setText("Like the Chinese ships, they were relatively new, ");
            textArea3.setText("the product of the country's modernisation over the past 30 years or so.");
            textArea4.setText("Although smaller than the Chinese ships, they were faster ");
            textArea5.setText("and their sailors were more disciplined and better trained.");
            button15.remove(button15);
            addAll();
        }
    });
    button16.addMouseListener(new MouseAdapter() {
        @Override
        public void mousePressed(MouseEvent paramMouseEvent){
            textArea.setText("Well, the Japanese ships were much faster and could manouveur around and dodge ");
            textArea2.setText("the Chinese's shells and torpedoes and things.");
            textArea3.setText("Admiral Togo of the Imperial Japanese Japanese Navy had previously paid a courtesy ");
            textArea4.setText("call to the Chinese fleet and discovered that the guns were");
            textArea5.setText("dirty and some also has washing hung over them.");
            panel.remove(button16);
            panel.add(button8);
            addAll();
        }
    });

    at.setText("Admiral Ting Juchang");
    at.setForeground(Color.YELLOW);
    at.setHorizontalTextPosition(JLabel.CENTER);
    at.setVerticalTextPosition(JLabel.CENTER);
    panel.add(at, FlowLayout.CENTER);

    a.setText("Admiral Liu Buchan");
    a.setForeground(Color.YELLOW);
    a.setHorizontalTextPosition(JLabel.CENTER);
    a.setVerticalTextPosition(JLabel.CENTER);
    panel.add(a, FlowLayout.RIGHT);

    ai.setText("Admiral Sukeyuki Itoh");
    ai.setForeground(Color.YELLOW);
    ai.setHorizontalTextPosition(JLabel.CENTER);
    ai.setVerticalTextPosition(JLabel.CENTER);
    panel.add(ai, FlowLayout.LEADING);

    bt.setText("Admiral Tsuboi Togo");
    bt.setForeground(Color.YELLOW);
    bt.setHorizontalTextPosition(JLabel.CENTER);
    bt.setVerticalTextPosition(JLabel.CENTER);
    panel.add(bt, FlowLayout.LEFT);

    panel.add(bg, FlowLayout.TRAILING);

    setVisible(true);
}
}

---

首先，可能导致问题的原因是您正在使用==来比较字符串。通常，您应该只使用==来比较基本值。否则，最好使用.equals方法

如果您能够澄清“jammed”的确切含义，这将大大有助于调试此问题。添加一些打印语句/使用调试器精确计算程序停止的位置。我假设这是某种GUI琐事游戏中的一个类？据我所知，if语句不应该引起任何问题。我的猜测是，您的程序中的其他部分导致了该问题

另外，我注意到的另一件事是，在if（ans2==“1984）的情况下，分数和-，之间有一个空格

---

如果你能发布更多的信息，我肯定能帮你更多。

你应该在所有的

切换案例中都
打断
语句
，还要
比较
两个字符串，你应该使用
等于
而不是
=
到底是什么“卡住”了“什么意思？谢谢。稍后我将发布其余的代码。是的，这是一个供学校使用的GUI小游戏。我所说的“堵塞”是指应用程序冻结，按钮没有响应