Question

关于java中的事件触发问题: 为什么按下键盘并释放的时候KeyReleased方法没有被调用，代码如下：

import java.awt.event.*;import java.awt.*;
import javax.swing.*;
public class Test {
JTextField text1;
JTextField text2;
public Test()
{
JFrame frame=new JFrame();
Container contain=frame.getContentPane();
text1=new JTextField(10);
text2=new JTextField(10);
MyKeyEvent e=new MyKeyEvent();
text1.addKeyListener(e);
contain.setLayout(new FlowLayout());
contain.add(text1);
contain.add(text2);
text1.setFocusable(true);
frame.pack();
frame.setVisible(true);
}
class MyKeyEvent extends KeyAdapter
{

public void KeyReleased(KeyEvent e)
{
System.out.println("I have been called");
text2.setText(text1.getText());
}
}
public static void main(String args[])
{
Test test=new Test();
}
}

Answer 1

你写错事件了，是实现keylistener事件不是继承那个adapter类
import java.awt.event.*;
import java.awt.*;
import javax.swing.*;
public class Test
{
JTextFieldtext1;
JTextFieldtext2;
public Test()
{
JFrame frame = new JFrame();
Container contain = frame.getContentPane();
text1 = new JTextField(10);
text2 = new JTextField(10);
MyKeyEvent e = new MyKeyEvent();
text1.addKeyListener(e);
contain.setLayout(new FlowLayout());
contain.add(text1);
contain.add(text2);
text1.setFocusable(true);
frame.pack();
frame.setVisible(true);
}
class MyKeyEvent implements KeyListener
{
@Override
public void keyTyped(KeyEvent e)
{
}
@Override
public void keyPressed(KeyEvent e)
{
}
@Override
public void keyReleased(KeyEvent e)
{
System.out.println(e.getKeyChar());
}
}
public static void main(String args[])
{
Test test = new Test();
}
}