复利计算器3.0更新版
1 import java.text.DecimalFormat; 2 3 4 public class Calculate { 5 // 形参为本金，利率，存入年限 6 // F：复利终值 7 // P：本金 8 // I：利率 9 // N：存入年限 10 // C: 年复利次数 11 double principal;//本金 12 double yearRate;//年利率 13 int years;//存入年限 14 int bonusTime;//年复利次数 15 double compoundInterest;//复利终值 16 double simpleInterest; 17 double i; 18 DecimalFormat df = new DecimalFormat("#.0000"); 19 boolean error = false; 20 21 public Calculate(String P, String I, String N, String C, String F) { 22 if(P == null || P.length() <= 0){ 23 principal = 0; 24 }else { 25 try { 26 principal = Double.parseDouble(P); 27 } catch (Exception e) { 28 error = true; 29 } 30 } 31 32 if(I == null || I.length() <= 0){ 33 yearRate = 0; 34 }else { 35 try { 36 yearRate = Double.parseDouble(I); 37 } catch (Exception e) { 38 error = true; 39 } 40 } 41 42 if(N == null || N.length() <= 0){ 43 years = 0; 44 }else { 45 try { 46 years = Integer.parseInt(N); 47 } catch (Exception e) { 48 error = true; 49 } 50 } 51 52 if(C == null || C.length() <= 0){ 53 bonusTime = 0; 54 }else { 55 try { 56 bonusTime = Integer.parseInt(C); 57 } catch (Exception e) { 58 error = true; 59 } 60 } 61 62 if(F == null || F.length() <= 0){ 63 compoundInterest = 0; 64 }else { 65 try { 66 compoundInterest = Double.parseDouble(F); 67 } catch (Exception e) { 68 error = true; 69 } 70 } 71 72 i = Math.pow(1.0 + yearRate / bonusTime, bonusTime) - 1; 73 } 74 75 76 //求复利终值 77 public String calculateCompoundInterest(){ 78 compoundInterest = principal * Math.pow((1 + i), years); 79 return df.format(compoundInterest); 80 } 81 //求本金 82 public String calculatePrincipal() { 83 principal = compoundInterest / Math.pow((1 + i), years); 84 return df.format(principal); 85 } 86 //求时间 87 public String calculateYears() { 88 if((Math.log(compoundInterest / principal) / Math.log(1 + i)) % 1 > 0){ 89 years = (int) (Math.log(compoundInterest / principal) / Math.log(1 + i)) + 1; 90 } 91 return String.valueOf(years); 92 } 93 //求单利 94 public String calculateSimpleInterest() { 95 simpleInterest = principal * yearRate * years + principal; 96 return String.valueOf(simpleInterest); 97 } 98 //求利率 99 public String calculateI(){ 100 i = Math.pow((compoundInterest / principal), (1.0 / years)) - 1; 101 return df.format(i); 102 } 103 //求投资回报 104 public String calculateInvestment() { 105 double investment; 106 investment = principal * (1 + yearRate) * (Math.pow((1 + yearRate), years) - 1) / yearRate; 107 return df.format(investment); 108 } 109 //求还款 110 public String calculateRepayment() { 111 double repayment; 112 //等额本息每月还款 = 本金*年利率/12*(1+年利率/12)^贷款月数/((1+年利率/12)^贷款月数-1) 113 repayment = principal * (yearRate / 12) * Math.pow((1 + (yearRate / 12)), (years * 12)) / (Math.pow((1 + (yearRate / 12)), (years * 12)) - 1); 114 return df.format(repayment); 115 } 116 }
1 import java.awt.Font; 2 import java.awt.event.ItemEvent; 3 import java.awt.event.ItemListener; 4 import java.awt.event.MouseAdapter; 5 import java.awt.event.MouseEvent; 6 7 import javax.swing.DefaultComboBoxModel; 8 import javax.swing.JButton; 9 import javax.swing.JComboBox; 10 import javax.swing.JFrame; 11 import javax.swing.JLabel; 12 import javax.swing.JOptionPane; 13 import javax.swing.JTextField; 14 import javax.swing.SwingUtilities; 15 import javax.swing.UIManager; 16 17 import org.dyno.visual.swing.layouts.Constraints; 18 import org.dyno.visual.swing.layouts.GroupLayout; 19 import org.dyno.visual.swing.layouts.Leading; 20 21 //VS4E -- DO NOT REMOVE THIS LINE! 22 public class MainFrame extends JFrame { 23 24 private static final long serialVersionUID = 1L; 25 private JLabel jLabel0; 26 private JLabel jLabel1; 27 private JLabel jLabel2; 28 private JLabel jLabel3; 29 public MainFrame() { 30 initComponents(); 31 } 32 33 private void initComponents() { 34 setLayout(new GroupLayout()); 35 add(getJLabel0(), new Constraints(new Leading(60, 10, 10), new Leading(70, 10, 10))); 36 add(getJLabel1(), new Constraints(new Leading(60, 10, 10), new Leading(170, 10, 10))); 37 add(getJLabel2(), new Constraints(new Leading(60, 10, 10), new Leading(270, 10, 10))); 38 add(getJLabel3(), new Constraints(new Leading(60, 10, 10), new Leading(370, 10, 10))); 39 add(getJLabel4(), new Constraints(new Leading(60, 10, 10), new Leading(470, 10, 10))); 40 add(getJTextField0(), new Constraints(new Leading(290, 300, 10, 10), new Leading(70, 50, 10, 10))); 41 add(getJTextField1(), new Constraints(new Leading(290, 300, 10, 10), new Leading(170, 50, 10, 10))); 42 add(getJTextField2(), new Constraints(new Leading(290, 300, 10, 10), new Leading(270, 50, 10, 10))); 43 add(getJTextField3(), new Constraints(new Leading(290, 300, 10, 10), new Leading(370, 50, 10, 10))); 44 add(getJTextField4(), new Constraints(new Leading(290, 300, 10, 10), new Leading(470, 50, 10, 10))); 45 add(getJComboBox0(), new Constraints(new Leading(622, 161, 10, 10), new Leading(107, 61, 10, 10))); 46 add(getJButton0(), new Constraints(new Leading(643, 12, 12), new Leading(257, 10, 10))); 47 setSize(808, 600); 48 } 49 50 private JComboBox getJComboBox0() { 51 if (jComboBox0 == null) { 52 jComboBox0 = new JComboBox(); 53 jComboBox0.setFont(new Font("宋体", Font.BOLD, 40)); 54 jComboBox0.setModel(new DefaultComboBoxModel(new Object[] { "求复利", "求本金", "求利率", "求时间", "求单利", "求回报", "求还款" })); 55 jComboBox0.setDoubleBuffered(false); 56 jComboBox0.setBorder(null); 57 jComboBox0.addItemListener(new ItemListener() { 58 59 public void itemStateChanged(ItemEvent event) { 60 jComboBox0ItemItemStateChanged(event); 61 } 62 }); 63 } 64 return jComboBox0; 65 } 66 67 private JTextField getJTextField4() { 68 if (jTextField4 == null) { 69 jTextField4 = new JTextField(); 70 jTextField4.setFont(font); 71 jTextField4.setEditable(false); 72 } 73 return jTextField4; 74 } 75 76 private JLabel getJLabel4() { 77 if (jLabel4 == null) { 78 jLabel4 = new JLabel(); 79 jLabel4.setFont(new Font("宋体", Font.BOLD, 40)); 80 jLabel4.setText("复利终值："); 81 } 82 return jLabel4; 83 } 84 85 private JButton getJButton0() { 86 if (jButton0 == null) { 87 jButton0 = new JButton(); 88 jButton0.setFont(new Font("宋体", Font.BOLD, 40)); 89 jButton0.setText("计算"); 90 jButton0.addMouseListener(new MouseAdapter() { 91 92 public void mouseClicked(MouseEvent event) { 93 jButton0MouseMouseClicked(event); 94 } 95 }); 96 } 97 return jButton0; 98 } 99 100 private JTextField getJTextField3() { 101 if (jTextField3 == null) { 102 jTextField3 = new JTextField(); 103 jTextField3.setFont(font); 104 } 105 return jTextField3; 106 } 107 108 private JTextField getJTextField2() { 109 if (jTextField2 == null) { 110 jTextField2 = new JTextField(); 111 jTextField2.setFont(font); 112 } 113 return jTextField2; 114 } 115 116 private JTextField getJTextField1() { 117 if (jTextField1 == null) { 118 jTextField1 = new JTextField(); 119 jTextField1.setFont(font); 120 } 121 return jTextField1; 122 } 123 124 private JTextField getJTextField0() { 125 if (jTextField0 == null) { 126 jTextField0 = new JTextField(); 127 jTextField0.setFont(font); 128 } 129 return jTextField0; 130 } 131 132 Font font = new Font("宋体",Font.BOLD,40); 133 private JTextField jTextField0; 134 private JTextField jTextField1; 135 private JTextField jTextField2; 136 private JTextField jTextField3; 137 private JButton jButton0; 138 private JLabel jLabel4; 139 private JTextField jTextField4; 140 private JComboBox jComboBox0; 141 private static final String PREFERRED_LOOK_AND_FEEL = "javax.swing.plaf.metal.MetalLookAndFeel"; 142 private JLabel getJLabel3() { 143 if (jLabel3 == null) { 144 jLabel3 = new JLabel(); 145 jLabel3.setFont(font); 146 jLabel3.setText("年复利次数："); 147 } 148 return jLabel3; 149 } 150 151 private JLabel getJLabel2() { 152 if (jLabel2 == null) { 153 jLabel2 = new JLabel(); 154 jLabel2.setFont(font); 155 jLabel2.setText("存入年限："); 156 } 157 return jLabel2; 158 } 159 160 private JLabel getJLabel1() { 161 if (jLabel1 == null) { 162 jLabel1 = new JLabel(); 163 jLabel1.setFont(new Font("宋体", Font.BOLD, 40)); 164 jLabel1.setText("年利率比："); 165 } 166 return jLabel1; 167 } 168 169 private JLabel getJLabel0() { 170 if (jLabel0 == null) { 171 jLabel0 = new JLabel(); 172 jLabel0.setFont(font); 173 jLabel0.setText("存入本金："); 174 } 175 return jLabel0; 176 } 177 178 private static void installLnF() { 179 try { 180 String lnfClassname = PREFERRED_LOOK_AND_FEEL; 181 if (lnfClassname == null) 182 lnfClassname = UIManager.getCrossPlatformLookAndFeelClassName(); 183 UIManager.setLookAndFeel(lnfClassname); 184 } catch (Exception e) { 185 System.err.println("Cannot install " + PREFERRED_LOOK_AND_FEEL + " on this platform:" + e.getMessage()); 186 } 187 } 188 189 /** 190 * Main entry of the class. 191 * Note: This class is only created so that you can easily preview the result at runtime. 192 * It is not expected to be managed by the designer. 193 * You can modify it as you like. 194 */ 195 public static void main(String[] args) { 196 installLnF(); 197 SwingUtilities.invokeLater(new Runnable() { 198 public void run() { 199 MainFrame frame = new MainFrame(); 200 frame.setDefaultCloseOperation(MainFrame.EXIT_ON_CLOSE); 201 frame.setTitle("复利计算器 V3.0"); 202 frame.getContentPane().setPreferredSize(frame.getSize()); 203 frame.pack(); 204 frame.setLocationRelativeTo(null); 205 frame.setVisible(true); 206 } 207 }); 208 209 210 } 211 212 private void jButton0MouseMouseClicked(MouseEvent event) { 213 214 // if (jTextField0.getText() == null || jTextField0.getText().length() <= 0) { 215 // JOptionPane.showMessageDialog( null,"请输入存入本金"); 216 // }else if (jTextField1.getText() == null || jTextField1.getText().length() <= 0){ 217 // JOptionPane.showMessageDialog( null,"请输入利率比"); 218 // }else if (jTextField2.getText() == null || jTextField2.getText().length() <= 0) { 219 // JOptionPane.showMessageDialog( null,"请输入存入年限"); 220 // }else if (jTextField3.getText() == null || jTextField3.getText().length() <= 0) { 221 // JOptionPane.showMessageDialog( null,"请输入年复利次数"); 222 // } 223 224 225 Calculate calculate = new Calculate(jTextField0.getText(), jTextField1.getText(), jTextField2.getText(), jTextField3.getText(), jTextField4.getText()); 226 if (calculate.error) { 227 JOptionPane.showMessageDialog(null, "输入有误，请重新输入", "错误", JOptionPane.ERROR_MESSAGE); 228 clear(); 229 } 230 if(jComboBox0.getSelectedItem() == "求本金"){ 231 jTextField0.setText(calculate.calculatePrincipal()); 232 }else if (jComboBox0.getSelectedItem() == "求复利") { 233 jTextField4.setText(calculate.calculateCompoundInterest()); 234 }else if (jComboBox0.getSelectedItem() == "求时间") { 235 jTextField2.setText(calculate.calculateYears()); 236 }else if(jComboBox0.getSelectedItem() == "求单利"){ 237 jTextField4.setText(calculate.calculateSimpleInterest()); 238 }else if(jComboBox0.getSelectedItem() == "求利率"){ 239 jTextField1.setText(calculate.calculateI()); 240 }else if(jComboBox0.getSelectedItem() == "求回报"){ 241 jTextField4.setText(calculate.calculateInvestment()); 242 }else if(jComboBox0.getSelectedItem() == "求还款"){ 243 jTextField4.setText(calculate.calculateRepayment()); 244 } 245 246 247 } 248 public void clear() { 249 jTextField0.setText(null); 250 jTextField1.setText(null); 251 jTextField2.setText(null); 252 jTextField3.setText(null); 253 jTextField4.setText(null); 254 } 255 256 public void initTextField(boolean a, boolean b, boolean c, boolean d, boolean e){ 257 jTextField0.setEditable(a); 258 jTextField1.setEditable(b); 259 jTextField2.setEditable(c); 260 jTextField3.setEditable(d); 261 jTextField4.setEditable(e); 262 } 263 264 public void initJLabel() { 265 jLabel0.setText("存入本金："); 266 jLabel1.setText("年利率比："); 267 jLabel2.setText("存入年限："); 268 jLabel3.setText("年复利次数："); 269 jLabel4.setText("复利终值："); 270 } 271 private void jComboBox0ItemItemStateChanged(ItemEvent event) { 272 if(event.getStateChange() == ItemEvent.SELECTED){ 273 clear(); 274 if (event.getItem() == "求本金") { 275 initTextField(false, true, true, true, true); 276 initJLabel(); 277 }else if (event.getItem() == "求复利") { 278 initTextField(true, true, true, true, false); 279 initJLabel(); 280 }else if (event.getItem() == "求时间") { 281 initTextField(true, true, false, true, true); 282 initJLabel(); 283 }else if (event.getItem() == "求单利") { 284 initTextField(true, true, true, false, false); 285 initJLabel(); 286 jLabel4.setText("单利本息："); 287 }else if (event.getItem() == "求利率") { 288 initTextField(true, false, true, true, true); 289 initJLabel(); 290 }else if (event.getItem() == "求回报") { 291 initTextField(true, true, true, false, false); 292 initJLabel(); 293 jLabel2.setText("投资期数："); 294 jLabel4.setText("投资回报值："); 295 }else if (event.getItem() == "求还款") { 296 initTextField(true, true, true, false, false); 297 initJLabel(); 298 jLabel0.setText("贷款金额："); 299 jLabel2.setText("还款年限："); 300 jLabel4.setText("月等额还款:"); 301 } 302 } 303 } 304 305 306 307 }
完成客户要求的对非法输入的判断和处理
添加功能贷款等额本息还款
对界面模块重构更为简洁易于后期更新
