testkeyadapter.java

来自「java2 primer plus一书源程序」· Java 代码 · 共 92 行

/*
 * TestKeyAdapter.java
 *
 * Created on August 9, 2002, 2:32 PM
 */

package ch14;

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


/**
 *
 * @author  Stephen Potts
 */
public class TestKeyAdapter extends Frame
{
    TextField tField;
    TextField tField2;
    TextField tField3;
    TextField tField4;
       
    /** Creates a new instance of TestKeyAdapter */
    public TestKeyAdapter()
    {
        tField = new TextField(15);
        tField2 = new TextField(15);
        tField3 = new TextField(15);
        tField4 = new TextField(20);
       
        Panel testPanel = new Panel();
        testPanel.setBackground(Color.gray);
        
        KeyStrokeHandler ksh = new KeyStrokeHandler();
        tField.addKeyListener(ksh);
        testPanel.add(tField);
        testPanel.add(tField2);
        testPanel.add(tField3);
        testPanel.add(tField4);
        add(testPanel);
        
        this.setLayout(new FlowLayout());
        
        addWindowListener(new WinCloser());
        setTitle("Using a KeyAdapter Object");
        setBounds( 100, 100, 600, 400);
        setVisible(true);
    }
    
    
    public static void main(String[] args)
    {
        TestKeyAdapter tka= new TestKeyAdapter();
    }
    
    class KeyStrokeHandler extends KeyAdapter
    {
        public void keyTyped(KeyEvent ke)
        {
            String newString = String.valueOf(ke.getKeyChar());
            tField2.setText(newString);
            tField3.setText("keyTyped() was called");
        }
        
        public void keyPressed(KeyEvent ke)
        {
            String newString = String.valueOf(ke.getKeyChar());
            tField2.setText(newString);
            tField4.setText("keyPressed() was called");
        }
        
        public void keyReleased(KeyEvent ke)
        {
            String newString = String.valueOf(ke.getKeyChar());
            tField2.setText(newString);
            tField4.setText("keyReleased() was called");
        }
    }
    
    
}



class WinCloser extends WindowAdapter
{
    public void windowClosing(WindowEvent e)
    {
        System.exit(0);
    }
}