复利计算器--结对编程

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

public class calcutor extends JFrame {

    private static final long serialVersionUID = 1L;
    File file1 = new File("fuli.txt");
    File file2 = new File("danli.txt");
    File file3 = new File("benjin.txt");
    File file4 = new File("lilv.txt");
    File file5 = new File("nianxian.txt");
    File file6 = new File("yuehuankuan.txt");

    public static void main(String[] args) {
    calcutor frame = new calcutor();
    frame.setVisible(true);
    frame.setBounds(100, 100, 500, 600);
    frame.setTitle("复利计算器5.1");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    }

    private JPanel jpanel;
    private JLabel label, label00, label01, label02, label03, label04, label05,
        label06, label07, label08, label09, label10, label11;
    private JComboBox<Object> box;
    private JTextField field01, field02, field03, field04, field05;
    private JButton button;
    private static double benjin, lilv, nianxian, zhongzhi, dingtou, huankuan,
        daikuan;
    private int index = 0;

    public calcutor() {

    jpanel = new JPanel();
    jpanel.setBounds(0, 0, 500, 600);
    jpanel.setLayout(null);
    add(jpanel);

    label = new JLabel("计算类型：");
    label.setFont(new Font(null, Font.BOLD, 15));
    label.setBounds(10, 10, 80, 30);
    jpanel.add(label);

    label06 = new JLabel();
    label06.setBounds(10, 320, 500, 40);
    jpanel.add(label06);

    label07 = new JLabel();
    label07.setBounds(10, 350, 500, 40);
    jpanel.add(label07);

    label08 = new JLabel();
    label08.setBounds(10, 380, 500, 40);
    jpanel.add(label08);

    label09 = new JLabel();
    label09.setBounds(10, 410, 500, 40);
    jpanel.add(label09);

    label10 = new JLabel();
    label10.setBounds(10, 440, 500, 40);
    jpanel.add(label10);

    label11 = new JLabel();
    label11.setBounds(10, 470, 500, 40);
    jpanel.add(label11);

    label00 = new JLabel("@113wangzekai、114jihan");
    label00.setFont(new Font(null, Font.BOLD, 15));
    label00.setBounds(290, 520, 200, 30);
    jpanel.add(label00);

    label01 = new JLabel("本金：");
    label01.setFont(new Font(null, Font.BOLD, 15));
    label01.setBounds(30, 80, 80, 30);
    jpanel.add(label01);

    label02 = new JLabel("年利率%：");
    label02.setFont(new Font(null, Font.BOLD, 15));
    label02.setBounds(30, 130, 80, 30);
    jpanel.add(label02);

    label03 = new JLabel("年限：");
    label03.setFont(new Font(null, Font.BOLD, 15));
    label03.setBounds(30, 180, 80, 30);
    jpanel.add(label03);

    label04 = new JLabel("定投金额：");
    label04.setFont(new Font(null, Font.BOLD, 15));
    label04.setBounds(30, 230, 80, 30);
    jpanel.add(label04);

    label05 = new JLabel("终值：");
    label05.setFont(new Font(null, Font.BOLD, 15));
    label05.setBounds(30, 280, 80, 30);
    jpanel.add(label05);

    // 文本框
    field01 = new JTextField();
    field01.setBounds(120, 80, 150, 30);
    jpanel.add(field01);

    field02 = new JTextField();
    field02.setBounds(120, 130, 150, 30);
    jpanel.add(field02);

    field03 = new JTextField();
    field03.setBounds(120, 180, 150, 30);
    jpanel.add(field03);

    field04 = new JTextField();
    field04.setBounds(120, 230, 150, 30);
    jpanel.add(field04);

    field05 = new JTextField();
    field05.setBounds(120, 280, 150, 30);
    jpanel.add(field05);

    // 初始化文本框
    field05.setText("计算所得");
    field05.setEnabled(false);

    // 计算按钮
    button = new JButton("计算");
    button.setBounds(250, 10, 80, 30);
    button.setFont(new Font(null, Font.BOLD, 15));
    jpanel.add(button);
    // 按钮监听
    button.addMouseListener(new MouseAdapter() {
        public void mouseClicked(MouseEvent e) {
        if (index == 0) {
            zhongzhi = fulicalcutor();
            if (zhongzhi != -1) {
            field05.setText(Double.toString(zhongzhi));
            field05.setEnabled(true);
            }
        } else if (index == 1) {
            zhongzhi = danlicalcutor();
            if (zhongzhi != -1) {
            field04.setText(Double.toString(zhongzhi));
            field04.setEnabled(true);
            }
        } else if (index == 2) {
            benjin = benjincalcutor();
            if (benjin != -1) {
            field01.setText(Double.toString(benjin));
            field01.setEnabled(true);
            }
        } else if (index == 3) {
            lilv = lilvcalcutor();
            if (lilv != -1) {
            field02.setText(Double.toString(lilv));
            field02.setEnabled(true);
            }
        } else if (index == 4) {
            nianxian = nianxiancalcutor();
            if (nianxian != -1) {
            field03.setText(Double.toString(nianxian));
            field03.setEnabled(true);
            }
        } else if (index == 5) {
            huankuan = yuehuankuanejisuan();
            if (huankuan != -1) {
            field04.setText(Double.toString(huankuan));
            field04.setEnabled(true);
            }
        }
        }
    });

    // 下拉菜单
    box = new JComboBox<Object>();
    box.setFont(new Font(null, Font.BOLD, 15));
    box.setModel(new DefaultComboBoxModel<Object>(new Object[] { "复利计算",
        "单利计算", "本金计算", "利率计算", "年限计算", "月还款额计算" }));
    box.setBounds(90, 10, 130, 30);
    jpanel.add(box);
    box.addItemListener(new ItemListener() {
        @Override
        public void itemStateChanged(ItemEvent e) {
        if (box.getSelectedIndex() == 0) {
            index = 0;
            change01();
            clear();
            field05.setText("计算所得");
            field05.setEnabled(false);
        } else if (box.getSelectedIndex() == 1) {
            index = 1;
            change();
            clear();
            field04.setText("计算所得");
            field04.setEnabled(false);
        } else if (box.getSelectedIndex() == 2) {
            index = 2;
            change();
            clear();
            field01.setText("计算所得");
            field01.setEnabled(false);
        } else if (box.getSelectedIndex() == 3) {
            index = 3;
            change();
            clear();
            field02.setText("计算所得");
            field02.setEnabled(false);
        } else if (box.getSelectedIndex() == 4) {
            index = 4;
            change();
            clear();
            field03.setText("计算所得");
            field03.setEnabled(false);
        } else if (box.getSelectedIndex() == 5) {
            index = 5;
            change02();
            clear();
            field04.setText("计算所得");
            field04.setEnabled(false);
        }
        }

    });
    }

    // 清除数据
    private void clear() {
    field01.setText(null);
    field02.setText(null);
    field03.setText(null);
    field04.setText(null);
    field05.setText(null);
    field01.setEnabled(true);
    field02.setEnabled(true);
    field03.setEnabled(true);
    field04.setEnabled(true);
    field05.setEnabled(true);
    }

    // 改变内容
    private void change02() {
    label01.setText("贷款金额：");
    label02.setText("年利率%：");
    label03.setText("还款期限：");
    label04.setText("月还款额：");
    label05.setText("");
    field05.setVisible(false);
    }

    private void change01() {
    label01.setText("本金：");
    label02.setText("年利率%：");
    label03.setText("年限：");
    label04.setText("定投金额：");
    label05.setText("终值：");
    field05.setVisible(true);
    }

    private void change() {
    label01.setText("本金：");
    label02.setText("年利率%：");
    label03.setText("年限：");
    label04.setText("终值：");
    label05.setText("");
    field05.setVisible(false);
    }

    // 月还款额计算
    private double yuehuankuanejisuan() {
    try {
        daikuan = Double.parseDouble(field01.getText());
        lilv = Double.parseDouble(field02.getText());
        nianxian = Double.parseDouble(field03.getText());
        // 小于或等于0的处理
        if (daikuan <= 0 || lilv <= 0 || nianxian <= 0) {
        JOptionPane.showMessageDialog(jpanel, "你输入的数据不能小于或等于零
"
            + "               请重新输入");
        } else {
        double yuehuankuan = yuehuankuan(daikuan, lilv, nianxian);
        try {
            FileOutputStream fos = new FileOutputStream(file6);
            OutputStreamWriter osw = new OutputStreamWriter(fos,
                "UTF-8");
            BufferedWriter bw = new BufferedWriter(osw);
            bw.write("月还款额计算：");
            bw.write(" 贷款金额：" + daikuan);
            bw.write(" 利率：" + lilv);
            bw.write(" 年限：" + nianxian);
            bw.write(" 月还款额：" + yuehuankuan);
            bw.close();
            osw.close();
            fos.close();
        } catch (FileNotFoundException e1) {
            e1.printStackTrace();
        } catch (IOException e1) {
            e1.printStackTrace();
        }
        String line = null;
        try {
            FileInputStream fis = new FileInputStream("yuehuankuan.txt");
            InputStreamReader isr = new InputStreamReader(fis);
            BufferedReader br = new BufferedReader(isr);

            try {
            while ((line = br.readLine()) != null) {
                System.out.println(line);
                label11.setText(line);
            }
            } catch (IOException e1) {
            e1.printStackTrace();
            }
            try {
            br.close();
            isr.close();
            fis.close();
            } catch (IOException e) {
            e.printStackTrace();
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        return yuehuankuan;
        }
    } catch (Exception e) {
        JOptionPane.showMessageDialog(jpanel, "请输入正确的数据");
    }
    return -1;

    }

    // 月还款额计算公式
    public final double yuehuankuan(double daikuan, double lilv, double nianxian) {
    huankuan = daikuan * (lilv / 12)
        * Math.pow(1 + lilv / 12, 12 * nianxian)
        / (Math.pow(1 + lilv / 12, 12 * nianxian) - 1);
    huankuan = Math.round(huankuan * 100) / 100;
    return huankuan;
    }

    // 年限计算
    private double nianxiancalcutor() {
    try {
        zhongzhi = Double.parseDouble(field04.getText());
        lilv = Double.parseDouble(field02.getText());
        benjin = Double.parseDouble(field01.getText());
        // 小于或等于0的处理
        if (zhongzhi <= 0 || lilv <= 0 || benjin <= 0) {
        JOptionPane.showMessageDialog(jpanel, "你输入的数据不能小于或等于零
"
            + "               请重新输入");
        } else {
        double nianxian = nianxian(zhongzhi, lilv, benjin);
        try {
            FileOutputStream fos = new FileOutputStream(file5);
            OutputStreamWriter osw = new OutputStreamWriter(fos,
                "UTF-8");
            BufferedWriter bw = new BufferedWriter(osw);
            bw.write("年限计算：");
            bw.write(" 本金：" + benjin);
            bw.write(" 利率：" + lilv);
            bw.write(" 终值：" + zhongzhi);
            bw.write(" 年限：" + nianxian);
            bw.close();
            osw.close();
            fos.close();
        } catch (FileNotFoundException e1) {
            e1.printStackTrace();
        } catch (IOException e1) {
            e1.printStackTrace();
        }
        String line = null;
        try {
            FileInputStream fis = new FileInputStream("nianxian.txt");
            InputStreamReader isr = new InputStreamReader(fis);
            BufferedReader br = new BufferedReader(isr);
            try {
            while ((line = br.readLine()) != null) {
                System.out.println(line);
                label10.setText(line);
            }
            } catch (IOException e1) {
            e1.printStackTrace();
            }
            try {
            br.close();
            isr.close();
            fis.close();
            } catch (IOException e) {
            e.printStackTrace();
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        return nianxian;
        }
    } catch (Exception e) {
        JOptionPane.showMessageDialog(jpanel, "请输入正确的数据");
    }
    return -1;
    }

    // 年限计算公式
    public final double nianxian(double zhongzhi, double lilv, double benjin) {
    nianxian = (Math.log(zhongzhi / benjin) / Math.log(1 + lilv));
    nianxian = Math.round(nianxian);
    return nianxian;
    }

    // 利率计算
    private double lilvcalcutor() {
    try {
        zhongzhi = Double.parseDouble(field04.getText());
        nianxian = Double.parseDouble(field03.getText());
        benjin = Double.parseDouble(field01.getText());
        // 小于或等于0的处理
        if (zhongzhi <= 0 || benjin <= 0 || nianxian <= 0) {
        JOptionPane.showMessageDialog(jpanel, "你输入的数据不能小于或等于零
"
            + "               请重新输入");
        } else {
        double lilv = lilv(zhongzhi, nianxian, benjin);
        try {
            FileOutputStream fos = new FileOutputStream(file4);
            OutputStreamWriter osw = new OutputStreamWriter(fos,
                "UTF-8");
            BufferedWriter bw = new BufferedWriter(osw);
            bw.write("利率计算：");
            bw.write(" 终值：" + zhongzhi);
            bw.write(" 年限：" + nianxian);
            bw.write(" 本金：" + benjin);
            bw.write(" 利率：" + lilv);
            bw.close();
            osw.close();
            fos.close();
        } catch (FileNotFoundException e1) {
            e1.printStackTrace();
        } catch (IOException e1) {
            e1.printStackTrace();
        }
        String line = null;
        try {
            FileInputStream fis = new FileInputStream("lilv.txt");
            InputStreamReader isr = new InputStreamReader(fis);
            BufferedReader br = new BufferedReader(isr);
            try {
            while ((line = br.readLine()) != null) {
                System.out.println(line);
                label09.setText(line);
            }
            } catch (IOException e1) {
            e1.printStackTrace();
            }
            try {
            br.close();
            isr.close();
            fis.close();
            } catch (IOException e) {
            e.printStackTrace();
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        return lilv;
        }
    } catch (Exception e) {
        JOptionPane.showMessageDialog(jpanel, "请输入正确的数据");
    }
    return -1;
    }

    // 利率计算公式
    public final double lilv(double zhongzhi, double nianxian, double benjin) {
    lilv = Math.pow((zhongzhi / benjin), (1.0 / nianxian)) - 1;
    lilv = Math.round(lilv * 100) / 100.0;
    return lilv;
    }

    // 本金计算
    private double benjincalcutor() {
    try {
        zhongzhi = Double.parseDouble(field04.getText());
        lilv = Double.parseDouble(field02.getText());
        nianxian = Double.parseDouble(field03.getText());
        // 小于或等于0的处理
        if (zhongzhi <= 0 || lilv <= 0 || nianxian <= 0) {
        JOptionPane.showMessageDialog(jpanel, "你输入的数据不能小于或等于零
"
            + "               请重新输入");
        } else {
        double benjin = benjin(zhongzhi, lilv, nianxian);
        try {
            FileOutputStream fos = new FileOutputStream(file3);
            OutputStreamWriter osw = new OutputStreamWriter(fos,
                "UTF-8");
            BufferedWriter bw = new BufferedWriter(osw);
            bw.write("本金计算：");
            bw.write(" 终值：" + zhongzhi);
            bw.write(" 利率：" + lilv);
            bw.write(" 年限：" + nianxian);
            bw.write(" 本金：" + benjin);
            bw.close();
            osw.close();
            fos.close();
        } catch (FileNotFoundException e1) {
            e1.printStackTrace();
        } catch (IOException e1) {
            e1.printStackTrace();
        }
        String line = null;
        try {
            FileInputStream fis = new FileInputStream("benjin.txt");
            InputStreamReader isr = new InputStreamReader(fis);
            BufferedReader br = new BufferedReader(isr);
            try {
            while ((line = br.readLine()) != null) {
                System.out.println(line);
                label08.setText(line);
            }
            } catch (IOException e1) {
            e1.printStackTrace();
            }
            try {
            br.close();
            isr.close();
            fis.close();
            } catch (IOException e) {
            e.printStackTrace();
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        return benjin;
        }
    } catch (Exception e) {
        JOptionPane.showMessageDialog(jpanel, "请输入正确的数据");
    }
    return -1;
    }

    // 本金计算公式
    public final double benjin(double zhongzhi, double lilv, double nianxian) {
    benjin = zhongzhi / (Math.pow(1 + lilv, nianxian));
    benjin = Math.round(benjin * 100) / 100;
    return benjin;
    }

    // 单利计算
    private double danlicalcutor() {
    try {
        benjin = Double.parseDouble(field01.getText());
        lilv = Double.parseDouble(field02.getText());
        nianxian = Double.parseDouble(field03.getText());
        // 小于或等于0的处理
        if (benjin <= 0 || lilv <= 0 || nianxian <= 0) {
        JOptionPane.showMessageDialog(jpanel, "你输入的数据不能小于或等于零
"
            + "               请重新输入");
        } else {
        double zhongzhi = zhongzhi(benjin, lilv, nianxian);
        try {
            FileOutputStream fos = new FileOutputStream(file2);
            OutputStreamWriter osw = new OutputStreamWriter(fos,
                "UTF-8");
            BufferedWriter bw = new BufferedWriter(osw);
            bw.write("单利计算：");
            bw.write(" 本金：" + benjin);
            bw.write(" 利率：" + lilv);
            bw.write(" 年限：" + nianxian);
            bw.write(" 终值：" + zhongzhi);
            bw.close();
            osw.close();
            fos.close();
        } catch (FileNotFoundException e1) {
            e1.printStackTrace();
        } catch (IOException e1) {
            e1.printStackTrace();
        }
        String line = null;
        try {
            FileInputStream fis = new FileInputStream("danli.txt");
            InputStreamReader isr = new InputStreamReader(fis);
            BufferedReader br = new BufferedReader(isr);
            try {
            while ((line = br.readLine()) != null) {
                System.out.println(line);
                label07.setText(line);
            }
            } catch (IOException e1) {
            e1.printStackTrace();
            }
            try {
            br.close();
            isr.close();
            fis.close();
            } catch (IOException e) {
            e.printStackTrace();
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        return zhongzhi;
        }
    } catch (Exception e) {
        JOptionPane.showMessageDialog(jpanel, "请输入正确的数据");
    }
    return -1;
    }

    // 单利计算公式
    public final double zhongzhi(double benjin, double lilv, double nianxian) {
    zhongzhi = benjin * (1 + lilv * nianxian);
    zhongzhi = Math.round(zhongzhi * 100) / 100;
    return zhongzhi;
    }

    // 複利計算
    private double fulicalcutor() {

    try {
        benjin = Double.parseDouble(field01.getText());
        lilv = Double.parseDouble(field02.getText());
        nianxian = Double.parseDouble(field03.getText());
        try {
        dingtou = Double.parseDouble(field04.getText());
        } catch (NumberFormatException e2) {
        dingtou = 0;
        }
      //小于或等于0的处理
        if (benjin <= 0 || lilv <= 0 || nianxian <= 0) {
        JOptionPane.showMessageDialog(jpanel, "你输入的数据不能小于或等于零
"
            + "               请重新输入");
        } else {
        double zhongzhi = zhongzhi(benjin, lilv, nianxian, dingtou);
        try {
            FileOutputStream fos = new FileOutputStream(file1);
            OutputStreamWriter osw = new OutputStreamWriter(fos,
                "UTF-8");
            BufferedWriter bw = new BufferedWriter(osw);
            bw.write("复利计算：");
            bw.write(" 本金：" + benjin);
            bw.write(" 利率：" + lilv);
            bw.write(" 年限：" + nianxian);
            bw.write(" 定投金额：" + dingtou);
            bw.write(" 终值：" + zhongzhi);
            bw.close();
            osw.close();
            fos.close();
        } catch (FileNotFoundException e1) {
            e1.printStackTrace();
        } catch (IOException e1) {
            e1.printStackTrace();
        }

        String line = null;
        try {
            FileInputStream fis = new FileInputStream("fuli.txt");
            InputStreamReader isr = new InputStreamReader(fis);
            BufferedReader br = new BufferedReader(isr);
            try {
            while ((line = br.readLine()) != null) {
                System.out.println(line);
                label06.setText(line);
            }
            } catch (IOException e1) {
            e1.printStackTrace();
            }
            try {
            br.close();
            isr.close();
            fis.close();
            } catch (IOException e) {
            e.printStackTrace();
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        return zhongzhi;
        }
    } catch (Exception e) {
        JOptionPane.showMessageDialog(jpanel, "请输入正确的数据");
    }
    return -1;
    }

    // 复利计算公式
    public final double zhongzhi(double benjin, double lilv, double nianxian,
        double dingtou) {
    for (int i = 0; i < nianxian; i++) {
        benjin = benjin * (1 + lilv);
        benjin = benjin + dingtou;
    }
    zhongzhi = benjin - dingtou;
    zhongzhi = Math.round(zhongzhi * 100) / 100;
    return zhongzhi;
    }
}

　　本次更新，可以让用户在计算出结果后，可以看到之前的记录，方便用户进行比较，我和队友之间采用轮流打代码的方法，大概花了一个小时的时间做好这次更新。

估计时间	2h
实际时间	1h

　　这次第一次结对，我发现两个人结对，相对于一个人来说，所耗费的精力会减少，而取得成果却比单人的要高，当然在结对中也会出现一些问题，编程习惯不同的人在一起编程会产生矛盾，

有时候对问题有不同的意见，各执己见会浪费很多时间在争执讨论上。

同伴的博客园地址：201406114114—纪焓  http://www.cnblogs.com/Leey0917/p/5360788.html

程序运行结果：