scrollbartest.java

这是清华大学编写的JAVA教材中所有题目的源代码！

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

class ScrollbarTest extends Frame implements AdjustmentListener
{
	Panel p=new Panel();
	Button btn=new Button("Button");
	Scrollbar hsb=new Scrollbar(Scrollbar.HORIZONTAL,0,10,0,200);	
	Scrollbar vsb=new Scrollbar(Scrollbar.VERTICAL,0,10,0,200);	
	int x=0,y=0;
	
	public ScrollbarTest(String title) 
	{
		super(title);

		hsb.addAdjustmentListener(this);
		vsb.addAdjustmentListener(this);
		
		p.setLayout(null);
		btn.setBounds(x,y,50,20);
		p.add(btn);
		
		add(p,BorderLayout.CENTER);
		add(hsb,BorderLayout.SOUTH);
		add(vsb,BorderLayout.EAST);
		
		setSize(250,250);
		setVisible(true);		
	}

	public void adjustmentValueChanged(AdjustmentEvent e)
	{
		
		Scrollbar sb=(Scrollbar)e.getSource();

		if(sb.getOrientation()==Scrollbar.HORIZONTAL)
			x=sb.getValue();
		else if(sb.getOrientation()==Scrollbar.VERTICAL)
			y=sb.getValue();
			
		btn.setLocation(x,y);
	}

	public static void main(String args[])
	{
		new ScrollbarTest("滚动条示例");
	}
}