例7-26.java

用Java和XML建立试题库管理系统,试题库管理系统的设计

//example 7-26
import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;
public class tt extends Applet implements ActionListener
{
   Button left,center,right;
   char ch;
   int asc;
   public void init()
   {
   	 left=new Button("Left");
   	 left.addActionListener(this);
   	 add(left);
   	 center=new Button("Center");
   	 center.addActionListener(this);
   	 add(center);
   	 right=new Button("Right");
   	 right.addActionListener(this);
   	 add(right);
   }
   public void actionPerformed(ActionEvent e)
   {
   	 int align;
   	 if(e.getSource()==left) align=FlowLayout.LEFT;
   	 else if(e.getSource()==center)
   	    align=FlowLayout.CENTER;
   	 else  align=FlowLayout.RIGHT;
   	 setLayout(new FlowLayout(align));
   	 validate();
   }
}