我想对我的窗口监听键盘按键以执行操作运行程序后，能够监听，但点击过窗口内后就没法监听了，该怎么弄才能只要焦点在窗口就可以一直都可以监听importjava.awt.*;importjava.awt.even...
我想对我的窗口监听键盘按键以执行操作
运行程序后，能够监听，但点击过窗口内后就没法监听了，该怎么弄才能只要焦点在窗口就可以一直都可以监听
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class KeyTest extends JFrame implements KeyListener{
private JFrame f = new JFrame("key");
private Canvas canvas = new Canvas();
public KeyTest()
{
super("key");
canvas.setSize(200,200);
this.add(canvas);
this.setSize(210,220);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.addKeyListener(this);
this.setLocation(200, 250);
this.setVisible(true);
}
public void keyPressed(KeyEvent e)
{
int key = e.getKeyCode();
switch(key)
{
case KeyEvent.VK_E:
System.out.println("press E");
break;
}
}
public void paint(Graphics g)
{
super.paint(g);
g.setColor(Color.red);
g.fillRect(0, 20, 50, 50);
}
public void repaint()
{
Graphics g = canvas.getGraphics();
g.setColor(Color.white);
g.fillRect(0, 0, 200, 200);
}
public void keyTyped(KeyEvent e)
{
}
public void keyReleased(KeyEvent e)
{
}
public static void main(String []args)
{
new KeyTest();
}
}
恩，期待高手！ :)
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