Question

java中添加键盘事件时使用keyPresseb()方法不起作用怎么回事？ 源码如下： PS.如果格式看不惯还有图片

import java.awt.*;import java.awt.event.*;class ButtonDemo{ private Frame f; private Button b; private TextField tf; ButtonDemo() { init(); } public void init() { f = new Frame(); b = new Button("退出"); tf = new TextField(30); f.setBounds(300,200,500,400); f.setLayout(new FlowLayout()); f.add(tf); f.add(b); MyEvent(); f.setVisible(true); } public void MyEvent() { //键盘事件 b.addKeyListener(new KeyAdapter() { public void keyPresseb(KeyEvent e)//按下键 { if(e.getKeyCode()==KeyEvent.VK_N) { System.exit(0); } System.out.println(KeyEvent.getKeyText(e.getKeyCode())+"--"+e.getKeyCode()); } public void keyReleased(KeyEvent e)//释放键 { if(e.isShiftDown() && e.getKeyCode()==e.VK_E) { System.exit(0); } System.out.println(KeyEvent.getKeyText(e.getKeyCode())+"--"+e.getKeyCode()); } }); //屏蔽键 tf.addKeyListener(new KeyAdapter() { public void keyPresseb(KeyEvent e) { int i = e.getKeyCode(); if(!(i>=e.VK_0 && i<=e.VK_9)) { e.consume(); System.out.println("请输入数字"); } } }); } public static void main(String[]args) { new ButtonDemo(); }}

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Answer 1

KeyListener是监听键盘输入的，监听按钮点击事件还是需要使用actionListener
b.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
System.out.println(e.getActionCommand());
}
});

Answer 2

引用dark19861201的回答：
KeyListener是监听键盘输入的，监听按钮点击事件还是需要使用actionListener
b.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
System.out.println(e.getActionCommand());
}
});

他问的不是keyPresseb吗，函数名错了吧，应该是keyPressed