字符串文本不显示在appendText在JAVA

Question

我正在NetbeanJava中做一个猜谜游戏。将猜测数字与目标数字进行比较后的结果（消息/字符串文本）没有显示在反馈面板文本区域中。我使用appendText将文本从MainFrame类传递到febackPanel类。但是，按下猜测按钮后文本没有显示在febackPanel中。请帮助我。

大型机。Java语言

public class MainFrame extends JFrame{
    FeedbackPanel formPanel;
    InputPanel textPanel;
    public static int target;
    JTextArea ta;
    
    public MainFrame()
    {
    super("HIgher-Lower Game");
        
    formPanel=new FeedbackPanel();
    add(formPanel, BorderLayout.EAST);
       
        textPanel=new InputPanel();
        add(textPanel, BorderLayout.WEST);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
       

        formPanel.setFormListener(new FormListener(){
            public void formEventOccurred(FormEvent e){
                int num = e.getNum();
                //int square=num*num;
                if (num == target)
                    {
                       formPanel.appendText("Congratulations, your guess is correct!");
                        //formPanel.setText("Congratulations, your guess is correct!");
                        //ta.setText("Congratulations, your guess is correct!");
                        //System.out.paMairintln("Congratulations, your guess is correct!");
                    }
                else if (num > target)
                    //if guess is higher than the target
                    {
                        formPanel.appendText("Your guess is higher than the target");
                        //formPanel.setText("Your guess is higher than the target");
                        //ta.setText("Your guess is higher than the target");
                        //System.out.println("Your guess is higher than the target");
                    }
                else if (num < target)
                    //if guess is lower than the target
                    {
                        formPanel.appendText("Your guess is lower than the target");
                        //formPanel.setText("Your guess is lower than the target");
                        //ta.setText("Your guess is lower than the target");
                        //System.out.println("Your guess is lower than the target");
                    }
                //textPanel.appendText(Integer.toString(square));
            } 
        });
        
        textPanel=new InputPanel();
        add(textPanel, BorderLayout.WEST);
                
        setSize(300,300);
    setVisible(true);
    this.pack();
    
    }
     
    public static void main(String[] args) {
        Random random = new Random();
        target = random.nextInt(100);
         
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
        new MainFrame();
            }
    });
    }
}

输入面板。Java语言

public class InputPanel extends JPanel {
    private JLabel label1;
    private JTextField tfIn;
    private JButton b;
    
    private FormListener formListener;

    public FormListener getTextListener() {
        return formListener;
    }

    public void setFormListener(FormListener formListener) {
        this.formListener = formListener;
    }

    public InputPanel() {
        GridBagLayout gb=new GridBagLayout();
        GridBagConstraints gbc=new GridBagConstraints();
        gbc.insets=new Insets(5,5,5,5);
        setLayout(gb);
        setBorder(BorderFactory.createTitledBorder("InputForm"));
        
        label1 = new JLabel ("Enter number [1-100]");
        gbc.anchor=GridBagConstraints.FIRST_LINE_END;
        gbc.gridx=1;
        gbc.gridy=1;
        gbc.gridheight=1;
        gbc.gridwidth=1;
        add(label1,gbc);
        
        tfIn = new JTextField (10);
        gbc.gridx=1;
        gbc.gridy=2;
        gbc.gridheight=1;
        gbc.gridwidth=1;
        add(tfIn,gbc);
        
        b = new JButton ("Guess");
        gbc.anchor=GridBagConstraints.CENTER;
        gbc.gridx=1;
        gbc.gridy=3;
        gbc.gridheight=1;
        gbc.gridwidth=2;
        add(b,gbc);
        
        b.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent e){
                int num = Integer.parseInt(tfIn.getText());
                FormEvent ev=new FormEvent(this,num);
                if(formListener != null){
                    formListener.formEventOccurred(ev);
                }
            }
            
        });
    }
}

反馈面板。Java语言

public class FeedbackPanel extends JPanel{
    JTextArea ta;

    FormListener listen;
        
    public FeedbackPanel(){
        setBorder(BorderFactory.createTitledBorder("Feedback"));
        setLayout(new BorderLayout());
        ta=new JTextArea(5,20);
        
        
        add(new JScrollPane(ta), BorderLayout.CENTER);
    }
    
    public void appendText(String text){
        ta.append(text + "\n" + "\r");
    
    }

    public void setFormListener(FormListener formListener) {
        this.listen = formListener;
    }




 
}

表格vent.java

public class FormEvent extends EventObject{
    private int num;

    public int getNum() {
        return num;
    }

    public void setNum(int num) {
        this.num = num;
    }
    
    public FormEvent(Object source){
        super(source);
    }
    
    public FormEvent(Object source, int num){
        super(source);
        this.num=num;
    }
}

表格istener.java

public interface FormListener extends EventListener{
    public void formEventOccurred(FormEvent e); 
    
}

Answer 1

首先：把这个放在听众面前：

textPanel=new InputPanel();
    add(textPanel, BorderLayout.WEST) 

第二：您需要在结束时定义电子显示功能

formEventOccurred(FormEvent e)