responsetokeypanel.java

Java语言

import java.awt.*;
import java.awt.event.*;
public class ResponseToKeyPanel extends Frame implements KeyListener{
	String keyName="";
	char ch;
	int code;
	Color clr;
	Panel p; 
	public ResponseToKeyPanel(String s){
		super(s);
		p=new Panel();
		p.setSize(300,300);
		addWindowListener(new WindowAdapter(){
			public void windowClosing(WindowEvent e){
				dispose();
				System.exit(0);	
			}	
		});
		add(p);
		p.setBackground(Color.cyan);
		p.addKeyListener(this);
		p.requestFocus();	
//		pack();
		setSize(302,302);
		show();
	}
/*	public void init(){
		addKeyListener(this);
		requestFocus();	
	}*/	
	public void paint(Graphics g){
		g.setColor(clr);
		g.drawString("健的名称："+KeyEvent.getKeyText(code),20,20);
		g.drawString("健代表的字符："+ch,20,40);
		g.drawString("健的编码值："+code,20,60);
		g.drawString("VK_UNDEFINED:"+KeyEvent.VK_UNDEFINED,20,80);
		g.drawString("CHAR_UNDEFINED:"+KeyEvent.CHAR_UNDEFINED,20,100);	
	}
	public void keyPressed(KeyEvent e){}
	public void keyReleased(KeyEvent e){
		ch=e.getKeyChar();
		code=e.getKeyCode();
		validate();	
	}
	public void keyTyped(KeyEvent e){
		if(e.getKeyChar()=='r'||e.getKeyChar()=='R')
			clr=Color.red;
		else if(e.getKeyChar()=='g'||e.getKeyChar()=='G')
			clr=Color.green;
		else if(e.getKeyChar()=='b'||e.getKeyChar()=='B')
			clr=Color.blue;
		else
			clr=null;
//		repaint();
		p.setBackground(clr);
	}
	public static void main(String args[]){
		new ResponseToKeyPanel("TestPanel");	
	}
}