?? 例7-22.java
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//example 7-22
import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;
public class tt extends Applet implements ItemListener
{
CheckboxGroup ColorGroup;
Checkbox red,green,blue,yellow;
Color color;
public void init()
{
ColorGroup=new CheckboxGroup();
color=Color.red;
red=new Checkbox("Red",ColorGroup,true);
red.addItemListener(this);
add(red);
green=new Checkbox("Green",ColorGroup,false);
green.addItemListener(this);
add(green);
blue=new Checkbox("Blue",ColorGroup,false);
blue.addItemListener(this);
add(blue);
yellow=new Checkbox("Yellow",ColorGroup,false);
yellow.addItemListener(this);
add(yellow);
}
public void itemStateChanged(ItemEvent e)
{
if(e.getSource()==red)color=Color.red;
if(e.getSource()==green)color=Color.green;
if(e.getSource()==blue)color=Color.blue;
if(e.getSource()==yellow)color=Color.yellow;
repaint();
}
public void paint(Graphics g)
{
g.setColor(color);
g.fillOval(60,60,40,40);
}
}
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