java代码请求指教

import java.awt.*;import java.awt.event.*;import java.applet.*;import javax.swing.*;public class MainWindow extends Frame implements ActionListener{ Label lab1,lab2,lab3,lab4,lab5,lab6,lab7,lab8;TextField text1,text2,text3,text4,text5;CheckboxGroup sex;Checkbox male,female;Choice group;Panel scan,operation;public void init() { setLayout(null);setSize(450,500);setVisible(true);lab1=new Label("用户编号");lab2=new Label("姓名");lab3=new Label("性别");lab4=new Label("类别");lab5=new Label("出生日期");lab6=new Label("联系方式");lab7=new Label("家庭住址");lab8=new Label("照片");text1=new TextField();text1.setEditable(false);text2=new TextField();text3=new TextField();text4=new TextField();text5=new TextField();sex=new CheckboxGroup();male=new Checkbox("男",sex,true);female=new Checkbox("女",sex,fals 收起