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Java KeyListener 的使用

Java KeyListener 的使用

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//package java_key;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

class KeyWork extends JFrame implements KeyListener
{
	private JLabel status;
	public KeyWork()
	{
		super("abcd");
		status = new JLabel();
		status.setFont(new Font("TimesRoman", Font.BOLD, 50));
		getContentPane().add(status, BorderLayout.CENTER);
		addKeyListener(this);
		setSize(700,500);
		show();
	}
	public void keyPressed(KeyEvent e) {
		char ch = e.getKeyChar();
		status.setText(String.valueOf(ch) + "   " +(int)ch);
	}
	public void keyTyped(KeyEvent e) {
	   
	}
	public void keyReleased(KeyEvent e) {
	   
	}
}

public class Main {
	public static void main(String[] args) {
		KeyWork app = new KeyWork();
		app.addWindowListener(new WindowAdapter(){
			public void windowClosing(WindowEvent e) {
				System.exit(0);
			}
		});
	}
}