import java.awt.*;
import java.applet.*;
import java.awt.event.*;
import javax.swing.*;
import java.awt.event.*;
public class abc extends JFrame implements KeyListener,ActionListener
{ JButton a=new JButton("sdfds");
JButton b=new JButton("ok");
JButton c=new JButton("dff");
int x=0,y=0;
Container cp=getContentPane();
public abc()
{
c.setEnabled(false);
b.setEnabled(false);
cp.add(b);
cp.add(c);
cp.add(a);
cp.setLayout(new FlowLayout());
setSize(200,200);
this.setVisible(true);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
b.addKeyListener(this);
c.addKeyListener(this);
b.addActionListener(this);
c.addActionListener(this);
a.addActionListener(this);
}
public void actionPerformed(ActionEvent e){
if(e.getSource()==a)
c.setEnabled(true);c.setFocusable(true);
b.setEnabled(true);b.setFocusable(true);
}
public void keyPressed(KeyEvent e)
{
switch(e.getKeyCode())
{
case KeyEvent.VK_LEFT://¹â±ê×ó¼ü
b.setBackground(Color.black);
c.setBackground(Color.blue);
// b.setLocation(x,y);
break;
}
}
public void keyReleased(KeyEvent Ke)
{}
public void keyTyped(KeyEvent Ke)
{}
public static void main(String[] arg){
new abc();
}
}
当你单击a 时侯 b,c被激活 但是键盘事件却不起作用 除非你先点一下那个按纽
郁闷中......... 冬天裸体跪求答案 多谢!@#$%
