keydemo.java

来自「这是清华大学编写的JAVA教材中所有题目的源代码！」· Java 代码 · 共 56 行

import java.awt.*;
import java.awt.event.*;

class KeyDemo  
{
	Frame f=new Frame("键盘示例");
	TextField tf1=new TextField(20);
	TextField tf2=new TextField(20);
	
	public KeyDemo() 
	{
		f.addWindowListener(new WindowAdapter()
		{
			public void windowClosing(WindowEvent e)
			{
				System.exit(0);
			}
		});
		
		tf1.addKeyListener(new KeyAdapter()
		{
			public void keyPressed(KeyEvent e)
			{
				int kCode=e.getKeyCode();
				String s1="KeyCode="+kCode;
				String s2=" KeyText="+e.getKeyText(kCode);
				
				tf2.setText(s1+s2);
				if(e.isAltDown())
					tf2.setText(tf2.getText()+" 你按下了Alt键");
				if(e.isControlDown())
					tf2.setText(tf2.getText()+" 你按下了Ctrl键");
				if(e.isShiftDown())
					tf2.setText(tf2.getText()+" 你按下了Shift键");
				if(kCode==e.VK_F1)
					tf2.setText(tf2.getText()+" 你按下了F1键");
			}
			
			public void keyTyped(KeyEvent e)
			{
				tf2.setText(tf2.getText()+" KeyChar="+e.getKeyChar());
			}
			
		});

		f.add(tf1,BorderLayout.NORTH);
		f.add(tf2,BorderLayout.SOUTH);
		f.setSize(350,200);
		f.setVisible(true);		
	}
	
	public static void main(String args[])
	{
		new KeyDemo();
	}
}