java之 ------ 图形界面（三）

import java.awt.*;import java.awt.event.*;import javax.swing.*;import javax.swing.border.TitledBorder;public class UserJFrame extends JFrame implements ActionListener {    private int number=1;                                  //编号    private JTextField text_number, text_name;             //编号、姓名文本行    private JRadioButton radiob_male, radiob_female;       //性别按钮    private Object cities[][];                             //存储多省的城市    private JComboBox combox_province, combox_city;        //省份、城市组合框    private JButton button_add;                            //添加按钮    private JTextArea text_user;                           //文本区       public UserJFrame(Object provinces[], Object cities[][])//参数指定省份和城市数组    {        super("输入用户信息");        this.setSize(740, 300);        this.setLocationRelativeTo(null);        this.setDefaultCloseOperation(EXIT_ON_CLOSE);        JPanel rightpanel=new JPanel(new GridLayout(6,1));//右面板        JPanel leftpanel=new JPanel(new BorderLayout());//左面板        leftpanel.setBorder(new TitledBorder("Person"));        JSplitPane split=new JSplitPane(JSplitPane.HORIZONTAL_SPLIT,rightpanel,leftpanel);//水平分隔窗格，左右各添加一个面板        split.setDividerLocation(140);//设置水平分隔条的位置        split.setEnabled(false);//设置分隔条不能变动        this.getContentPane().add(split);//框架内容窗格添加分隔窗格        text_user = new JTextArea();        text_user.setEditable(false);        leftpanel.add(text_user);        leftpanel.add(new JScrollPane(text_user));//设置文本编辑域可以滚动                text_number = new JTextField("1");                 //编号文本行        text_number.setEditable(false);                    //不可编辑，编号自动生成        rightpanel.add(text_number);        text_name = new JTextField("姓名");        rightpanel.add(text_name);        JPanel panel_rb=new JPanel(new GridLayout(1,2));   //单选按钮子面板，网格布局，1行2列        rightpanel.add(panel_rb);        ButtonGroup bgroup = new ButtonGroup();            //按钮组        radiob_male = new JRadioButton("男",true);         //创建单选按钮，默认选中        bgroup.add(radiob_male);                           //单选按钮添加到按钮组        panel_rb.add(radiob_male);                         //单选按钮添加到子面板        radiob_female = new JRadioButton("女");        bgroup.add(radiob_female);        panel_rb.add(radiob_female);        this.cities = cities;        combox_province = new JComboBox(provinces);        //省份组合框        combox_province.setEditable(false);                 //设置组合框可编辑         combox_province.addActionListener(this);        rightpanel.add(combox_province);        combox_city = new JComboBox(cities[0]);            //城市组合框        rightpanel.add(combox_city);                button_add = new JButton("添加");        button_add.addActionListener(this);        rightpanel.add(button_add);        this.setVisible(true);    }    public void actionPerformed(ActionEvent e)             //单击事件处理方法    {        if (e.getSource()==combox_province)                //在组合框的下拉列表中选择数据项时        {            int i=combox_province.getSelectedIndex();      //省份组合框当前选中项序号            combox_city.removeAllItems();                  //清除地区组合框中原所有内容            for (int j=0; j<this.cities[i].length; j++)                combox_city.addItem(this.cities[i][j]);    //地区组合框添加数据项        }            if (e.getSource() == button_add)                   //单击按钮        {            String aline=number+", "+text_name.getText();            if (radiob_male.isSelected())                  //指定单选按钮选中时                aline += ", "+radiob_male.getText();       //获得单选按钮表示的性别字符串             if (radiob_female.isSelected())                aline += ", "+radiob_female.getText();            aline += ", "+combox_province.getSelectedItem(); //获得组合框选中项的字符串            aline += ", "+combox_city.getSelectedItem();            text_user.append(aline+"\n");                  //文本区添加一行字符串            this.number++;                                 //编号自动加1            text_number.setText(""+this.number);            text_name.setText("姓名");        }    }        public static void main(String arg[])    {        Object provinces[]={"江苏省", "浙江省"};        Object cities[][]={{"南京市","苏州市","无锡市"}, {"杭州市","宁波市","温州市"}};        new UserJFrame(provinces, cities);    }}