大虾请进？帮初学者一个忙~~跪谢啊。。。关于投票系统的

   我们做了一个很简单的投票系统：在三人选出两人（每张选票可选一到两人）为班干，同时在两人中选出一人（每张选票只选而且必须选一人）为班长，选好选票后点击“投票”按钮透出一张选票，按“统计”按钮统计并在文本框中输出选票。代码我们有，但是就是编译不过，请大家帮忙下。。指出错误并改正，，，谢谢~~
import java.awt.*;
import java.awt.event.*;
class MyWindow extends Frame
{
        Checkbox cb1,cb2,cb3;
        Checkbox cb4,cb5;
        CheckboxGroup selectOne;
        TextArea ta;
        Button buttonVote,buttonCount;
        Panel panNorth,panCenter,panSouth;
        Panel panC1,panC2,panC3;
        MyWindow(String s)
        {
                super(s);
                panNorth=new Panel(); 
                panCenter=new Panel();
                panC1=new Panel();
                panC2=new Panel();
                panC3=new Panel();
                panSouth=new Panel();
                cb1=new Checkbox("张三");
                cb2=new Checkbox("李四");
                cb3=new Checkbox("李明");
                selectOne=new CheckboxGroup();
                cb4=new Checkbox("",selectOne,true);
                cb5=new Checkbox("",selectOne,false);
                ta=new TextArea(10,20);
                buttonVote=new Button("投票");
                buttonCount=new Button("统计");
                Label lb=new Label("班干部竞选投票系统",Label.CENTER);
                pan1.add(lb);
                add(pan1,BorderLayout.NORTH);
                pan2.add(cb1);
                pan2.add(cb2);
                pan2.add(cb3);
                pan2.add(cb4);
                pan2.add(cb5);
                add(pan2,BorderLayout.CENTER);
        pan2.add(ta);
                pan3.add(buttonVote);
                pan3.add(buttonCount);
                add(pan3,BorderLayout.SOUTH);
        //        setLayout(new FlowLayout());
                setBounds(100,100,500,500);
                setVisible(true);
                validate();
        }                
}public class ClassVote
{
        public static void main(String arg[])
        {
                MyWindow mw=new MyWindow("投票");
        }
}