图像编程----下拉菜单 Choice

import java.awt.*;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
public class nestedcontainer {

 /**
  * @param args
  */
 public static void main(String[] args) {
  // TODO Auto-generated method stub
new nestedcontainer().show();
 }
public void show()
{
f=new Frame("下拉菜单");
Choice choose=new Choice();//当使用了CheckboxGroup类,复选按钮只能有一个为on
choose.add("选项A ");
choose.add("选项B ");
choose.add("选项C ");

Panel p=new Panel();
p.add(choose);
f.add(p);
f.setSize(400,300);
f.addWindowListener(new WindowAdapter(){
 
 public void windowClosing(WindowEvent we)
 {
  System.exit(0);
  
 }
 
 
 
});

f.setVisible(true);

 

 

}
private Frame f;

 

 

}