hw15_13.java

JAVA 2面向对象程序设计(习题参考答案9-17).rar

import java.awt.*;
public class hw15_13 
{
   static Frame frm=new Frame("Checkbox class"); 
   static Checkbox ckb1=new Checkbox("ViewSonic");
   static Checkbox ckb2=new Checkbox("Sony");
   static Checkbox ckb3=new Checkbox("Benq");   
   
   public static void main(String args[])
   {
      CheckboxGroup grp=new CheckboxGroup();      
      frm.setSize(200,150);
      frm.setLayout(null);
      frm.setBackground(Color.yellow);
      ckb1.setBounds(50,40,100,20);
      ckb2.setBounds(50,60,100,20);
      ckb3.setBounds(50,80,100,20);      
      ckb1.setCheckboxGroup(grp);   
      ckb2.setCheckboxGroup(grp);   
      ckb3.setCheckboxGroup(grp); 
      ckb3.setState(true);   
      frm.add(ckb1);
      frm.add(ckb2); 
      frm.add(ckb3);       
      frm.setVisible(true); 
   }
}