checkboxpanel.java

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     import java.awt.*;

     public class CheckboxPanel extends AttributePanel
     {
          // 容纳Checkboxe的 CheckboxGroup 
          protected CheckboxGroup cbg;          

          // 覆盖Applet类的 init 方法
          public CheckboxPanel(String attr, String[] items, String selectedItem)
          {
               super(attr);
         
               setLayout(new GridLayout(items.length+1, 1, 5, 5));

               add(new Label(attribute, Label.CENTER));

               // 创建 CheckboxGroup     
               cbg = new CheckboxGroup();
               for(int i = 0; i < items.length; i++)
               {
                    add(new Checkbox(items[i], cbg, items[i].equals(selectedItem)));
               } 
          }

          public String toString()
          {
               return attribute + ": " + cbg.getSelectedCheckbox().getLabel();
          }

     }    // CheckboxPanel