hw17_15.java

JAVA 2面向对象程序设计(习题参考答案9-17).rar

import java.awt.*;  
import java.awt.event.*;  
public class hw17_15 extends Frame implements ActionListener
{
   static hw17_15 frm=new hw17_15();
   static Dialog dlg=new Dialog(frm);  
   static Button change_btn=new Button("Change Color"); 
   static Button ok_btn=new Button("Ok"); 
   static Button Cancel_btn=new Button("Cancel");
   static Checkbox ckb1=new Checkbox("Green");
   static Checkbox ckb2=new Checkbox("Yellow");
   static Checkbox ckb3=new Checkbox("White");
   static WinLis wlis=new WinLis();  
   
   public static void main(String args[])
   {
      CheckboxGroup grp=new CheckboxGroup();
      frm.setTitle("Frame");
      frm.setSize(200,150);
      dlg.setTitle("Dialog");  
      dlg.setSize(150,100);  
      frm.setLayout(null);            
      dlg.setLayout(null);
      ckb1.setCheckboxGroup(grp);
      ckb2.setCheckboxGroup(grp);
      ckb3.setCheckboxGroup(grp);
      change_btn.setBounds(40,40,120,30);
      ckb1.setBounds(10,20,60,30);
      ckb2.setBounds(10,40,60,30);
      ckb3.setBounds(10,60,60,30);
      ok_btn.setBounds(80,40,50,20);
      Cancel_btn.setBounds(80,60,50,20);
      dlg.add(ckb1); 
      dlg.add(ckb2); 
      dlg.add(ckb3); 
      dlg.add(ok_btn);    
      dlg.add(Cancel_btn); 
      frm.add(change_btn);  
      Cancel_btn.addActionListener(frm); 
      change_btn.addActionListener(wlis); 
      ok_btn.addActionListener(frm);         
      frm.setVisible(true); 
   }
   
   static class WinLis implements ActionListener  
   {
      public void actionPerformed(ActionEvent e) 
      {
         dlg.setLocation(80,30);  
         dlg.show();                 
      }
   }    
   
   public void actionPerformed(ActionEvent c) 
   {
      if(ckb1.getState()==true)
      {
         Button btn=(Button) c.getSource();   
         if(btn==ok_btn)   
         {
            dlg.dispose();     
            frm.setBackground(Color.green);     
         }
         else if (btn==Cancel_btn)  
            dlg.hide(); 
      } 
      else if(ckb2.getState()==true)
      {
         Button btn=(Button) c.getSource();   
         if(btn==ok_btn)   
         {
            dlg.dispose();     
            frm.setBackground(Color.yellow);     
         }
         else if (btn==Cancel_btn)  
            dlg.hide(); 
      }        
      else if(ckb3.getState()==true)
      {
         Button btn=(Button) c.getSource();   
         if(btn==ok_btn)   
         {
            dlg.dispose();      
            frm.setBackground(Color.white);     
         }
         else if (btn==Cancel_btn)  
            dlg.hide(); 
      }               
   }
}