testscrollbar.java

java2 primer plus一书源程序

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

package ch14;

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


/**
 *
 * @author  Stephen Potts
 */
public class TestScrollbar extends Frame
implements AdjustmentListener
{
    Scrollbar sb;
    TextField tField;
    
    
    /** Creates a new instance of TestScrollbar */
    public TestScrollbar()
    {
        sb=new Scrollbar(Scrollbar.VERTICAL, 0, 1, 0, 255);
        sb.addAdjustmentListener(this);
        add(sb);
        tField = new TextField(30);
        add(tField);
        
        
        this.setLayout(new FlowLayout());
        
        addWindowListener(new WinCloser());
        setTitle("Using a Scrollbar Object");
        setBounds( 100, 100, 400, 400);
        setVisible(true);
    }
    
    public void adjustmentValueChanged(AdjustmentEvent ae)
    {
        String newString = String.valueOf(sb.getValue());
        tField.setText(newString);
    }
    
    public static void main(String[] args)
    {
        TestScrollbar tsb= new TestScrollbar();
    }
    
    
}

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