java组件练习之复数计算器和下拉框联动

package test1;

public class test1 {
    public static void main(String[] args) {
        Window JF=new Window();
      }
}



package test1;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

class Window extends JFrame {
  JLabel number1;          
  JLabel number1T;
  JLabel number1_;
  JLabel number2;
  JLabel number2T;
  JLabel number2_;
  JTextField virtual1_text;
  JTextField true1_text;
  JTextField true2_text;
 
  JTextField virtual2_text;
  JButton addButton;             //加法+
  JButton subtractButton;        //减法-
  JButton multiplyButton;        //乘法*
  JButton divideButton;          //除法/
  JLabel showAnswer;
  JTextArea textShow;
  ComputerListener computer;
  public Window() {
    init();
    setVisible(true);
    setDefaultCloseOperation(DISPOSE_ON_CLOSE);
  }
  void init() {
    setLayout(new FlowLayout());
    setTitle("复数计算器");
    number1=new JLabel("复数1：");
    number1T=new JLabel("实部：");
    true1_text=new JTextField(18);
    number1_=new JLabel("虚部：");
    virtual1_text=new JTextField(18);
    number2=new JLabel("复数2：");
    number2T=new JLabel("实部：");
    true2_text=new JTextField(18);
    number2_=new JLabel("虚部：");
    virtual2_text=new JTextField(18);
    addButton=new JButton("+");
    subtractButton=new JButton("-");
    multiplyButton=new JButton("*");
    divideButton=new JButton("/");
    showAnswer=new JLabel("结果");
    textShow=new JTextArea(5,20);
    computer=new ComputerListener();
    computer.settrue1(true1_text);
    computer.setvirtual1(virtual1_text);
    computer.settrue2(true2_text);
    computer.setvirtual2(virtual2_text);
    computer.setJTextArea(textShow);
    addButton.addActionListener(computer);
    subtractButton.addActionListener(computer);
    multiplyButton.addActionListener(computer);
    divideButton.addActionListener(computer);
    setBounds(200,200,250,400);
    add(number1);//添加组件
    add(number1T);
    add(true1_text);
    add(number1_);
    add(virtual1_text);
    add(number2);
    add(number2T);
    add(true2_text);
    add(number2_);
    add(virtual2_text);
    add(addButton);
    add(subtractButton);
    add(multiplyButton);
    add(divideButton);
    add(showAnswer);
    add(textShow);
  }
}



import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class ComputerListener implements ActionListener{
    JTextField number1_true;//实部
    JTextField number1_virtual;//虚部
    JTextField number2_true;
    JTextField number2_virtual;
    JTextArea textShow;
    public void settrue1(JTextField t) {
      number1_true=t;//this.xx = xx;
    }
    public void setvirtual1(JTextField t) {
      number1_virtual=t;
    }
    public void settrue2(JTextField t) {
      number2_true=t;
    }
    public void setvirtual2(JTextField t) {
      number2_virtual=t;
    }
    public void setJTextArea(JTextArea t) {
      textShow=t;
    }
    public void actionPerformed(ActionEvent e) {
      try {
        double result_true=0;
        double result_virtual=0;      //getTEXT获取字符串形式
        double true1=Double.parseDouble(number1_true.getText());
        double virtual1=Double.parseDouble(number1_virtual.getText());
        double true2=Double.parseDouble(number2_true.getText());
        double virtual2=Double.parseDouble(number2_virtual.getText());
        if(e.getActionCommand().equals("+")) {
          result_true=true1+true2;
          result_virtual=virtual1+virtual2;
        }
        if(e.getActionCommand().equals("-")) {
          result_true=true1-true2;
          result_virtual=virtual1-virtual2;
        }
        if(e.getActionCommand().equals("*")) {
          result_true=(true1*true2-virtual1*virtual2);
          result_virtual=(true1*virtual2+true2*virtual1);
        }
        if(e.getActionCommand().equals("/")) {
          result_true=1.0*(true1*true2+virtual1*virtual2)/(true2*true2-virtual2*virtual2);
          result_virtual=1.0*(virtual1*true2-true1*virtual2)/(true2*true2-virtual2*virtual2);
        }
        textShow.append(result_true+"+"+result_virtual+"i"+"
");
      }
      catch(Exception ex) {//防止文本框为空，指针null
        textShow.append("
请重新输入数字
");
      }
    }

  }

package test2;

import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;

import javax.swing.ButtonGroup;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JRadioButton;
import javax.swing.JTextArea;
import javax.swing.JTextField;

public class test2 {
    public static void main(String [] args){
         window win= new window();
        win.setVisible(true);
        //win.setBounds(200, 200, 200, 200);         
         win.setTitle("name");
      }
}
    class window extends JFrame implements ItemListener,ActionListener{
         //各个组件
          JLabel name;
          JTextField name_text;
          
          JLabel gender;
          ButtonGroup gender_bg;//性别单选组
          JRadioButton man;
          JRadioButton woman;
          
          JLabel age;
          ButtonGroup age_bg;//年龄选择组
          JRadioButton age1;
          JRadioButton age2;
          JRadioButton age3;
          JRadioButton age4; //年龄选项
          
          JLabel address; //地址
          JLabel province_name;//省名字
          JLabel city_name;//市名字
          JLabel area_name;//区名字
          JComboBox Province;
          JComboBox City;
          JComboBox Area;//下拉列表
          JTextField specific_address;//具体地址输入框    
          
          JLabel hobby;//爱好  
          JCheckBox read_hobby;//爱好选项
          JCheckBox music_hobby;
          JCheckBox gane_hobby;
          JCheckBox ball_hobby;
          JCheckBox dance_hobby;
          JCheckBox sreech_hobby;      
          JLabel prize;//获奖      
          JTextArea prize_text;//文本区     
          JButton apply; //提交按钮
          //组件完毕
          public window() {
              setBounds(500,500,300,400);
              init();
              setVisible(true);                    
              setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
              
              
          }
          private  void  init(){//初始化            
                //第一行
              
                name=new JLabel("姓名：");
                name_text=new JTextField(10);
                gender=new JLabel("  性别：");
                man=new JRadioButton("男 ");
                woman=new JRadioButton("女   ");
                gender_bg=new ButtonGroup();
                gender_bg.add(man);
                gender_bg.add(woman);//合并到一起
                //第二行
                age=new JLabel("   年龄：     ");
                age1=new JRadioButton("  18岁以下  ");
                age2=new JRadioButton("  18-35岁     ");
                age3=new JRadioButton("  36-59岁      ");
                age4=new JRadioButton("  60岁以上           ");
                age_bg=new ButtonGroup();
                age_bg.add(age1);
                age_bg.add(age2);
                age_bg.add(age3);
                age_bg.add(age4);
                //地址
                address=new JLabel("  地址：");
                //省市县的标签
                province_name=new JLabel("省份：");
                city_name=new JLabel("市：");

                       
                /*废弃
                 * String [] province={"安徽省","山东省","浙江省"};
                 *  //三个对应的市 String[][] cities = newString[][]{{"海淀区","崇文区","西城区"},{"长沙市","株洲市","湘潭市"},{"广州市","深圳市","珠海市"}};
                 * cmbState=new JComboBox(province); 
                 * cmbCity=new JComboBox(cities[0]);
                 * cmbState.addItemListener(this);
                 */           
                
                //爱好区
                hobby=new JLabel("  爱好：");
                read_hobby=new JCheckBox("阅读   ");
                music_hobby=new JCheckBox("音乐   ");
                gane_hobby=new JCheckBox("玩游戏   ");
                ball_hobby=new JCheckBox("羽毛球   ");
                dance_hobby=new JCheckBox("跳舞   " );
                sreech_hobby=new JCheckBox("演讲     " );
                //获奖区
                //specific_address=new JTextField(30);
                prize=new JLabel("    曾获奖项：       ");
                prize_text=new JTextArea("",4,18);
                //提交
                apply=new JButton("提交");            
                apply.addActionListener(this);//提交按钮设置监视器事件处理           
              //  System.out.println("?????");
                

                //添加组件
                //第一行
                add(name);
                add(name_text);
                add(gender);
                add(man);
                add(woman);

                //第二行
                add(age);
                add(age1);
                add(age2);
                add(age3);
                add(age4);
                  
                //第三行
                Province = new JComboBox();
                Province.addItem("请选择省份  ");
                Province.addItem("陕西省");
                Province.addItem("安徽省");
                //Province.setSize(120, 30);
                //Province.setLocation(30, 30);
                Province.addItemListener(this);
                add(Province);

                City = new JComboBox();
                City.addItem("请选择城市");
                City.addItem(" ");
                //City.setSize(120, 30);
                //City.setLocation(30, 80);
                add(City);

                Area = new JComboBox();          
                //Area.setSize(120, 30);
                //Area.setLocation(30, 130);
                Area.addItem("请选择县区");
                add(Area);
                Area.addItem("   ");
                

               //add(specific_address);
                //爱好  第四行
                add(hobby);
                add(read_hobby);
                add(music_hobby);
                add(gane_hobby);
                add(ball_hobby);
                add(dance_hobby);
                add(sreech_hobby);
                //获奖区  第五行
                add(prize);
                add(prize_text);
                
                //提交按钮
                add(apply);            
                setVisible(true);
                setLayout(new FlowLayout());
               // setSize(400,550);
                //setResizable(false);
                                   
    }
          public void itemStateChanged(ItemEvent e) {
                String temp = ((JComboBox) e.getSource()).getSelectedItem().toString();

                if (temp.equals("陕西省")) {
                    City.removeItemListener(this);
                    City.removeAllItems();
                    City.addItemListener(this);
                    String[] city = { "西安市", "咸阳市",  };
                    for (int i = 0; i < city.length; i++) {
                        City.addItem(city[i]);
                    }
                }
                if (temp.equals("安徽省")) {
                    City.removeItemListener(this);
                    City.removeAllItems();
                    City.addItemListener(this);
                    String[] city = { "合肥市", "黄山市"};
                    for (int i = 0; i < city.length; i++) {
                        City.addItem(city[i]);
                    }
                }

                if (temp.equals("西安市")) {
                    Area.removeItemListener(this);
                    Area.removeAllItems();
                    Area.addItemListener(this);
                    String[] area = { "未央区", "雁塔区", "新城区" };   //动态数组存储地名
                    for (int i = 0; i < area.length; i++) {
                        Area.addItem(area[i]);
                    }
                }
                if (temp.equals("咸阳市")) {
                    Area.removeItemListener(this);
                    Area.removeAllItems();
                    Area.addItemListener(this);

                    Area.removeAllItems();

                    String[] area = { "秦都区", "渭滨区", "长武县", "武功县", "泾阳县" };
                    for (int i = 0; i < area.length; i++) {
                        Area.addItem(area[i]);
                    }
                }
                
                if (temp.equals("合肥市")) {
                    Area.removeItemListener(this);
                    Area.removeAllItems();
                    Area.addItemListener(this);
                    String[] area = { "庐阳区", "蜀山区" };
                    for (int i = 0; i < area.length; i++) {
                        Area.addItem(area[i]);
                    }
                }
                if (temp.equals("黄山市")) {
                    Area.removeItemListener(this);
                    Area.removeAllItems();
                    Area.addItemListener(this);

                    Area.removeAllItems();

                    String[] area = { "徽州区", "黄山区" };
                    for (int i = 0; i < area.length; i++) {
                        Area.addItem(area[i]);
                    }
                }
                


                if (temp.equals("   ")) {
                    Area.removeItemListener(this);
                    Area.removeAllItems();
                    Area.addItem("请选择市区");
                    City.removeItemListener(this);
                    City.removeAllItems();
                    City.addItem("请选择省份");
                }
            
            
    }
          public void actionPerformed(ActionEvent e) {
                //输出信息拼接字符串
                String message="姓名：";
                message+=name.getText().toString();
                message+="  性别：";
                if (man.isSelected()){
                  message+="男";
                }else {
                  if (woman.isSelected()){
                    message+="女";
                  }
                }
                //年龄
                message+="  年龄：";
                if (age1.isSelected()){
                  message+="18岁以下";

                }else if (age2.isSelected()){
                  message+="19-35岁";
                }else if (age3.isSelected()){
                  message+="36-59岁";
                }else if (age4.isSelected()) {
                  message += "60岁以上";
                }

                //地址
                message+="地址  ";
                message+=Province.getSelectedItem();
                message+=City.getSelectedItem();
                message+=Area.getSelectedItem();
                message+="  具体位置";
                message+=specific_address.getText();


                //爱好
                message+="  爱好";
                if (read_hobby.isSelected()){
                  message+="阅读  ";
                }
                if (music_hobby.isSelected()){
                  message+="音乐  ";
                }
                if (gane_hobby.isSelected()){
                  message+="玩游戏  ";
                }
                if (ball_hobby.isSelected()){
                  message+="羽毛球  ";
                }
                if (dance_hobby.isSelected()){
                  message+="跳舞 " ;
                }
                if (sreech_hobby.isSelected()){
                  message+="演讲  ";
                }

                //奖项
                if(prize.getText()!=""){
                  message+="曾获奖项  ";
                  message+=prize.getText();
                }
                JOptionPane.showConfirmDialog(this,message);
              }
          }

示意：

（联动方法较为笨拙，更好的方法还在学习）