Question

java中如何处理键盘事件？

Answer 1

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class Example6_12 extends JFrame implements KeyListener
{
	JButton b[]=new JButton[3];
	int x,y;
	public Example6_12()
	{
		setSize(300,300);
		setVisible(true);
		setLayout(new FlowLayout());
		for(int i=0;i<=2;i++)
		{
			b[i]=new JButton(" "+i);
			b[i].addKeyListener(this);
			add(b[i]);
		}
		validate();
	}
	public void KeyPressed(KeyEvent e)
	{
		JButton button=(JButton)e.getSource();
		x=button.getBounds().x;
		y=button.getBounds().y;
		if(e.getKeyCode()==KeyEvent.VK_UP)
		{
			y=y-2;
			if(y<=0)
				y=300;
			button.setLocation(x,y);
		}
		else if(e.getKeyCode()==KeyEvent.VK_DOWN)
		{
			y=y+2;
			if(y>=300)
				y=0;
			button.setLocation(x,y);
		}
		else if(e.getKeyCode()==KeyEvent.VK_LEFT)
		{
			x=x-2;
			if(x<=0)
				x=300;
			button.setLocation(x,y);
		}
		else if(e.getKeyCode()==KeyEvent.VK_RIGHT)
		{
			x=x+2;
			if(x>=300)
				x=0;
			button.setLocation(x,y);
		}
	}
	public void keyTyped(KeyEvent e){}
	public void keyReleased(KeyEvent e){}
        public void keyPressed(KeyEvent e){}
	public static void main(String[] args)
	{
		Example6_12 win=new Example6_12();
		win.setDefaultCloseOperation(EXIT_ON_CLOSE);
	}
}

Answer 2

添加键盘监听事件
如：
this.addKeyListener(new KeyAdapter() {
public void keyPressed(KeyEvent e){
int key = e.getKeyCode();//得到键盘输入的值
if(key==KeyEvent.VK_Q){//如果键盘输入的是Q
System.exit(0);//强行关闭当前进程
}