复利计算器--结对编程2.0
import java.awt.*; import java.awt.event.*; import java.io.BufferedReader; import java.io.BufferedWriter; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStreamReader; import java.io.OutputStreamWriter; import javax.swing.*; /* * 本次更新主要更新了在输入过程中输入负数或者零的处理方法， * 更新以后如果输入的数小于或等于零会弹框提示，并且不会输出结果 */ 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) { // TODO Auto-generated method stub calcutor frame = new calcutor(); frame.setVisible(true); frame.setBounds(100, 100, 500, 600); frame.setTitle("计算器3.1"); 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("0.03"); 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<>(); 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(); field02.setText("0.03"); field05.setText("计算所得"); field05.setEnabled(false); // System.out.println("复利计算"); } else if (box.getSelectedIndex() == 1) { index = 1; change(); clear(); field02.setText("0.03"); field04.setText("计算所得"); field04.setEnabled(false); // System.out.println("单利计算"); } else if (box.getSelectedIndex() == 2) { index = 2; change(); clear(); field02.setText("0.03"); field01.setText("计算所得"); field01.setEnabled(false); // System.out.println("本金计算"); } else if (box.getSelectedIndex() == 3) { index = 3; change(); clear(); field02.setText("计算所得"); field02.setEnabled(false); // System.out.println("利率计算"); } else if (box.getSelectedIndex() == 4) { index = 4; change(); clear(); field02.setText("0.03"); 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\n" + " 请重新输入"); } else { double yuehuankuan = yuehuankuan(daikuan, lilv, nianxian); try { FileOutputStream fos = new FileOutputStream(file6); OutputStreamWriter osw = new OutputStreamWriter(fos, "GBK"); BufferedWriter bw = new BufferedWriter(osw); bw.write("月还款额计算："); bw.write(" 贷款："+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) { // TODO Auto-generated catch block e1.printStackTrace(); } catch (IOException e1) { // TODO Auto-generated catch block 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) { // TODO Auto-generated catch block e1.printStackTrace(); } try { br.close(); isr.close(); fis.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } return yuehuankuan; } } catch (Exception e) { JOptionPane.showMessageDialog(jpanel, "请输入正确的数据"); // System.out.println("请输入数据"); } return -1; } // 月还款额的计算公式 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\n" + " 请重新输入"); } else { double nianxian = nianxian(zhongzhi, lilv, benjin); try { FileOutputStream fos = new FileOutputStream(file5); OutputStreamWriter osw = new OutputStreamWriter(fos, "GBK"); 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) { // TODO Auto-generated catch block e1.printStackTrace(); } catch (IOException e1) { // TODO Auto-generated catch block 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) { // TODO Auto-generated catch block e1.printStackTrace(); } try { br.close(); isr.close(); fis.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } return nianxian; } } catch (Exception e) { JOptionPane.showMessageDialog(jpanel, "请输入正确的数据"); // System.out.println("请输入数据"); } return -1; } // 年限的计算公式 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\n" + " 请重新输入"); } else { double lilv = lilv(zhongzhi, nianxian, benjin); try { FileOutputStream fos = new FileOutputStream(file4); OutputStreamWriter osw = new OutputStreamWriter(fos, "GBK"); 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) { // TODO Auto-generated catch block e1.printStackTrace(); } catch (IOException e1) { // TODO Auto-generated catch block 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) { // TODO Auto-generated catch block e1.printStackTrace(); } try { br.close(); isr.close(); fis.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } return lilv; } } catch (Exception e) { JOptionPane.showMessageDialog(jpanel, "请输入正确的数据"); // System.out.println("请输入数据"); } return -1; } // 利率的计算公式 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\n" + " 请重新输入"); } else { double benjin = benjin(zhongzhi, lilv, nianxian); try { FileOutputStream fos = new FileOutputStream(file3); OutputStreamWriter osw = new OutputStreamWriter(fos, "GBK"); 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) { // TODO Auto-generated catch block e1.printStackTrace(); } catch (IOException e1) { // TODO Auto-generated catch block 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) { // TODO Auto-generated catch block e1.printStackTrace(); } try { br.close(); isr.close(); fis.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } return benjin; } } catch (Exception e) { JOptionPane.showMessageDialog(jpanel, "请输入正确的数据"); // System.out.println("请输入数据"); } return -1; } // 本金的计算公式 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\n" + " 请重新输入"); } else { double zhongzhi=zhongzhi(benjin, lilv, nianxian); try { FileOutputStream fos = new FileOutputStream(file2); OutputStreamWriter osw = new OutputStreamWriter(fos, "GBK"); 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) { // TODO Auto-generated catch block e1.printStackTrace(); } catch (IOException e1) { // TODO Auto-generated catch block 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) { // TODO Auto-generated catch block e1.printStackTrace(); } try { br.close(); isr.close(); fis.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } return zhongzhi; } } catch (Exception e) { JOptionPane.showMessageDialog(jpanel, "请输入正确的数据"); // System.out.println("请输入数据"); } return -1; } // 单利的计算公式 public final double zhongzhi(double benjin, double lilv, double nianxian) { zhongzhi = benjin * (1 + lilv * nianxian); zhongzhi = Math.round(zhongzhi * 100) / 100; return zhongzhi; } // 复利计算 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\n" + " 请重新输入"); } else { double zhongzhi=zhongzhi(benjin, lilv, nianxian, dingtou); try { FileOutputStream fos = new FileOutputStream(file1); OutputStreamWriter osw = new OutputStreamWriter(fos, "GBK"); 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) { // TODO Auto-generated catch block e1.printStackTrace(); } catch (IOException e1) { // TODO Auto-generated catch block 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) { // TODO Auto-generated catch block e1.printStackTrace(); } try { br.close(); isr.close(); fis.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } return zhongzhi; } } catch (Exception e) { JOptionPane.showMessageDialog(jpanel, "请输入正确的数据"); // System.out.println("请输入数据"); } return -1; } // 复利的计算公式 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; } }
本次更新主要新增了预设某个数值的初始值，使用户不用每次都输入该相同的数据。
年利率初始值被设定为0.03，用户可以随时在界面更改该值。
