复利计算器v1

 public class MainFrame extends JFrame {

     /**
      * 文本框
      */
     private TextField[] texts = new TextField[5];

     /**
      * 标签
      */
     private JLabel[] labels = new JLabel[5];

     /**
      * 标签值
      */
     private String[] labelTexts = {"存入本金:","年利率(%):","存入年限:","年复利次数:","复利终值:"};

     /**
      * 确定按钮
      */
     private JButton jbtOk = new JButton("确定");

     /**
      * 退出按钮
      */
     private JButton jbtExit = new JButton("退出");

     /**
      * 利率获取时间的整数倍
      */
     private double N;

     /**
      * 复利终值
      */
     private double F;

     /**
      * 存入年限
      */
     private double Y;

     /**
      * 本金
      */
     private double P;

     /**
      * 利率
      */
     private double R;

     /**
      * 本金计算方式
      */
     private boolean pFlag;

     /**
      * 复利计算方式
      */
     private boolean fFlag;

     /**
      * 主窗体
      */
     public MainFrame() {
         this.setTitle("复利计算器");
         this.setBoundAtCenter();
         this.setResizable(true);
         //this.setLayout(new VFlowLayout());
         this.add(this.createTextPanel(), BorderLayout.CENTER);
         this.add(this.createButtonPanel(), BorderLayout.SOUTH);
         this.setDefaultCloseOperation(EXIT_ON_CLOSE);
         this.setVisible(true);
     }

     /**
      * 居中窗体
      */
     private void setBoundAtCenter() {
         Toolkit toolkit = Toolkit.getDefaultToolkit();
         Dimension dim = toolkit.getScreenSize();
         this.setSize(245, 350);
         int width = dim.width - this.getWidth() >> 1;
         int hight = (dim.height - this.getHeight() >> 1) - 32;
         this.setLocation(width, hight);
     }

     /**
      * 初始化文本框与标签位置以及标签值
      */
     private void initTextField() {
         int x = 90;
         int y = 50;
         int w = 130;
         int h = 20;
         for (int i = 0; i < texts.length; i++) {
             texts[i] = new TextField(x, y, w, h);
             labels[i] = new JLabel(labelTexts[i]);
             labels[i].setBounds(x-80, y, w, h);
             y += 28;
         }
     }

     /**
      * 创建面板存放TextField和label
      */
     private JPanel createTextPanel() {
         JPanel panel = new JPanel();
         panel.setLayout(null);
         this.initTextField();
         for (int i = 0; i < texts.length; i++) {
             panel.add(texts[i]);
             panel.add(labels[i]);
         }
         return panel;
     }

     /**
      * 设置按钮以及监听
      */
     private JPanel createButtonPanel(){

         JPanel btnPanel = new JPanel(new VFlowLayout());
         JPanel btnPanel1 = new JPanel(new FlowLayout());

         //----------设置jbtOk的监听------------------
         this.jbtOk.addActionListener(new ActionListener() {

             @Override
             public void actionPerformed(ActionEvent e) {
                 if(!pFlag) {
                     texts[0].setText(String.valueOf(calculatePrincipal()));
                 }else {
                     texts[4].setText(String.valueOf(calculateCInterest()));
                 }
             }

         });

         btnPanel1.add(this.jbtOk);

         //----------设置jbtExit的监听------------------
         this.jbtExit.addActionListener(new ActionListener() {

             @Override
             public void actionPerformed(ActionEvent e) {
                 // TODO Auto-generated method stub
                 System.exit(EXIT_ON_CLOSE);

             }
         });

         btnPanel1.add(this.jbtExit);
         //先添加ButtonGroup
         btnPanel.add(this.createButtonGroup());
         btnPanel.add(btnPanel1);
         return btnPanel;
     }

     /**
      * 设置jradio按钮以及监听
      */
     private JPanel createButtonGroup() {
         JPanel grpPanel = new JPanel(new FlowLayout(FlowLayout.CENTER));
         ButtonGroup btnGrp = new ButtonGroup();
         JRadioButton jrb1 = new JRadioButton("本金");
         //----------设置jrb1的监听------------------
         jrb1.addActionListener(new ActionListener() {

             @Override
             public void actionPerformed(ActionEvent e) {
                 pFlag = false;
                 fFlag = true;
                 changeType();
             }
         });
         btnGrp.add(jrb1);
         JRadioButton jrb2 = new JRadioButton("复利");
         //----------设置jrb2的监听------------------
         jrb2.addActionListener(new ActionListener() {

             @Override
             public void actionPerformed(ActionEvent e) {
                 pFlag = true;
                 fFlag = false;
                 changeType();
             }
         });
         btnGrp.add(jrb2);
         grpPanel.add(jrb1);
         grpPanel.add(jrb2);
         return grpPanel;
     }

     private void changeType() {
         this.texts[0].setEnabled(pFlag);
         this.texts[4].setEnabled(fFlag);
         if(pFlag) {
             this.texts[4].setText("由此得出数值");
             this.texts[0].setText(null);
         } else {
             this.texts[0].setText("由此得出数值");
             this.texts[4].setText(null);
         }
     }

     /**
      * F=P*(1+i)N(次方)
      * F：复利终值
      * P：本金
      * R：利率
      * N：利率获取时间的整数倍
      * Y: 存入年限
      *
      * 计算本金
      */
     private double calculatePrincipal(){
         this.R = Double.parseDouble(this.texts[1].getText().trim());
         this.Y = Double.parseDouble(this.texts[2].getText().trim());
         this.N = Double.parseDouble(this.texts[3].getText().trim());
         this.F = Double.parseDouble(this.texts[4].getText().trim());
         System.out.println(Math.pow((1+R),N));
         return F/Math.pow((1+R),N);

     }

     /**
      * 计算复利
      */
     private double calculateCInterest(){
         this.P = Double.parseDouble(this.texts[0].getText().trim());
         this.R = Double.parseDouble(this.texts[1].getText().trim());
         this.Y = Double.parseDouble(this.texts[2].getText().trim());
         this.N = Double.parseDouble(this.texts[3].getText().trim());
         return P*Math.pow((1+R),N);
     }
 }