有谁可以帮我解释一下这下面的程序代码是什么意思？为什么创建三个包？

Question

package test;

import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.TextField;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextArea;

public class work {

public static void main(String[] args) {
new RunFrame();
}
}

class RunFrame extends JFrame {

private JLabel name_label, sex_label, pro_label, lev_label;
private TextField field;
private JCheckBox manButton, womanButton;
private JComboBox proList, levList;
private JTextArea mainText;
private JButton confirmButton, cancelButton;
private JPanel panel1, panel2, panel3, panel4, panel5, panel6, panel1_2,
panel3_4, panel5_6;

public RunFrame() {
// this.setLayout(new GridLayout());
this.setTitle("个人简历");
this.setSize(300, 400);
this.setLocation(200, 200);
panel1 = new JPanel();
panel2 = new JPanel();
panel3 = new JPanel();
panel4 = new JPanel();
panel5 = new JPanel();
panel6 = new JPanel();
panel1_2 = new JPanel();
panel3_4 = new JPanel();
panel5_6 = new JPanel();
panel1.setLayout(new FlowLayout());
name_label = new JLabel("姓名");
panel1.add(name_label);
field = new TextField(6);

panel1.add(field);
panel2.setLayout(new FlowLayout());
sex_label = new JLabel("性别");
panel2.add(sex_label);
manButton = new JCheckBox("男");
panel2.add(manButton);
womanButton = new JCheckBox("女");
panel2.add(womanButton);

panel3.setLayout(new FlowLayout());
pro_label = new JLabel("专业");
panel3.add(pro_label);
String[] listValue1 = new String[] { "计算机", "电子", "工商" };
String[] listValue2 = new String[] { "大专", "本科", "硕士", "博士" };
proList = new JComboBox(listValue1);
panel3.add(proList);

panel4.setLayout(new FlowLayout());
lev_label = new JLabel("文化程度");
panel4.add(lev_label);
levList = new JComboBox(listValue2);
panel4.add(levList);

confimButtonAction cofaction = new confimButtonAction();
cancelButtonAction canaction = new cancelButtonAction();
panel5.setLayout(new FlowLayo

Answer 1

主要的就那个RunFrame类,Work类只有main函数,程序入口点

RunFrame里面的的panel就不说了

其实就类似与
public class RunFrame extends JFrame{

public RunFrame(){
//构造函数
}

public static void main(String args[]){
//入口点
RunFrame rf = new RunFrame();
}
}

那个work类可以不要的

Answer 2

只是在类中创建了一个内部类吧。。。
程序没细看，总之就是用JFrame里面填了JPanel JButton之类的组件画了一个填个人信息的面板