例7-23.java

来自「用Java和XML建立试题库管理系统,试题库管理系统的设计」· Java 代码 · 共 36 行

//example 7-23
import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;
public class tt extends Applet implements ItemListener,ActionListener
{
   List colorList;
   String colorNames[]={"Red","Green","Blue","Yellow"};
   Color colors[]={Color.red,Color.green,Color.blue,Color.yellow};
   
   Checkbox red,green,blue,yellow;
   int k;
   public void init()
   {
   	 colorList=new List(3,false);
   	 colorList.addActionListener(this);
   	 colorList.addItemListener(this);
   	 for(int i=0;i<colorNames.length;i++)
   	    colorList.add(colorNames[i]);
   	 add(colorList);
   }
   public void actionPerformed(ActionEvent e)
   {
   }
   public void itemStateChanged(ItemEvent e)
   {
   	 showStatus(colorList.getSelectedItem()+";index "+colorList.getSelectedIndex());
   	 k=colorList.getSelectedIndex();
   	 repaint();
   }
   public void paint(Graphics g)
   {
   	 g.setColor(colors[k]);
   	 g.fillRect(10,40,20,20);
   }
}