我设置了3个TextField，，目的是在TextField1输入的数显示在TextField3中，输入一个它就自动显示一个饿，输2个它显示2个，就是这样的，请问怎么处理呀，我先是监听的TextField1，但如果把这些数转到TextField3中呀。。谢谢了，可能问题问得不是很完整。。
要求是，在TextField1中输入数字，在TextField3中显示你输入的数字，当在TextField2中输入数字时，TextField3中自动显示TextField1和TextField2的和，也就是做加法运算，拜托各位了！！！
但是我始终做不到让它同步。。初学JAVA，还望高手指点呀。。
下面是我的源代码，请问应该怎么修改才能达到效果呢，谢谢！代码有点杂乱。。。
import java.awt.*;
import java.awt.event.*;

public class TextCounter {
    public static void main (String args[]) {
        new CounterFrame().lauchFrame();
    }
}

class CounterFrame extends Frame {
    TextField text1,text2,text3;
    public void lauchFrame() {
         text1 =new TextField ("0",10);
         text2 =new TextField ("0",10);
         text3 =new TextField ("0",10);
         text3.setEditable(false);
        Label label1 = new Label("+");
        Label label2 = new Label("=");
        setLayout(new FlowLayout(FlowLayout.LEFT));
        setLocation(300,400);
        setSize(400,300);
        setBackground(Color.red);
        text1.addFocusListener(new CounterFocusListener());
        text2.addFocusListener(new CounterFocusListener1());
        //text2.addFocusListener(new CounterFocusListener());
        //text2.add(new CounterFocusListener());
        text3.addKeyListener(new CounterKeyAdapter());
        //setDefaultCloseOperation(Frame.EXIT_ON_CLOSE);
        add(text1);
        add(label1);
        add(text2);
        add(label2);
        add(text3);
        setVisible(true);
    }
    class CounterFocusListener implements FocusListener{
        public void focusGained(FocusEvent e) {
            //text3.setFocusable(true);
            int num1 = Integer.parseInt(text1.getText());
            int num2 = Integer.parseInt(text2.getText());
            text3.setText(""+ (num1 + num2));
        }
        
        public void focusLost(FocusEvent e) {
            //text3.setFocusable(true);
            int num1 = Integer.parseInt(text1.getText());
            int num2 = Integer.parseInt(text2.getText());
            text3.setText(""+ (num1 + num2));
        }
    }
    class CounterFocusListener1 implements FocusListener{
        public void focusGained(FocusEvent e) {
            //text3.setFocusable(true);
            int num1 = Integer.parseInt(text1.getText());
            int num2 = Integer.parseInt(text2.getText());
            text3.setText(""+ (num1 + num2));
        }
        
        public void focusLost(FocusEvent e) {
            //text3.setFocusable(true);
            int num1 = Integer.parseInt(text1.getText());
            int num2 = Integer.parseInt(text2.getText());
            text3.setText(""+ (num1 + num2));
        }
    }
    class CounterKeyAdapter extends KeyAdapter {
        public void keyTyped (KeyEvent e) {
            //text3.setText(text1.getText());
            //text3.setFocusable(true);
            text3.setText("" + e.getKeyChar());
        }
    }
   
}

你这个没错啊！要是像你说的在 2 里输完了就传到 3 ，可是你要想，计算机它怎么知道你输完了没有啊，所以做完输入还是要你自己退出 2 或者说回车的它才把结果传到 3 了。要是想要你说的那样输完了，让它自己完成+法也是可以的，就是你设置一个时间，比如说过了3秒，你就让它自动+了，可是这样不是更不好用了吗！

你的很多Listener没什么用处啊！ 我用你的代码加了一个TextListener可以实现你说的功能。

package testText;

import java.awt.*;
import java.awt.event.*;


class CounterFrame extends Frame {
    TextField text1,text2,text3;
    public void lauchFrame() {
         text1 =new TextField ("0",10);
         text2 =new TextField ("0",10);
         text3 =new TextField ("0",10);
         text3.setFocusable(false);
        Label label1 = new Label("+");
        Label label2 = new Label("=");
        setLayout(new FlowLayout(FlowLayout.LEFT));
        setLocation(300,400);
        setSize(400,300);
        setBackground(Color.cyan);
        text1.addFocusListener(new CounterFocusListener());
        text2.addFocusListener(new CounterFocusListener());
  //      text3.addFocusListener(new CounterFocusListener()); 

        text3.addTextListener(new textLister());
     

        add(text1);
        add(label1);
        add(text2);
        add(label2);
        add(text3);
        setVisible(true);
    }
    class CounterFocusListener implements FocusListener{
        public void focusGained(FocusEvent e) {
            //text3.setFocusable(true);
            int num1 = Integer.parseInt(text1.getText());
            int num2 = Integer.parseInt(text2.getText());
            text3.setText(""+ (num1 + num2));
           

        }
       

        public void focusLost(FocusEvent e) {
            //text3.setFocusable(true);
            int num1 = Integer.parseInt(text1.getText());
            int num2 = Integer.parseInt(text2.getText());
            text3.setText(""+ (num1 + num2));
        }
    }

     class textLister implements TextListener {

        @Override
        public void textValueChanged(TextEvent e) {
            text3.setFocusable(true);
            int num1 = Integer.parseInt(text1.getText());
            int num2 = Integer.parseInt(text2.getText());
            text3.setText(""+ (num1 + num2));
        }
        

     }
   

} 

你好，请问下为什么我把你的代码加进去就是错误的呢，他说方法未覆盖其父类的方法，就是这个@Override
请问还需要改动吗？

这个是应该是因为你用的JDK1.5吧！要么该1.6要么把那一句 @Override删除