package com.zhadan.Frame; import java.awt.event.MouseAdapter; //VS4E -- DO NOT REMOVE THIS LINE! public class MainFrame extends JFrame { private static final long serialVersionUID = 1L; private JLabel jLabel0; private JTextField jTextField0; private JLabel jLabel1; private JTextField jTextField1; private JTextField jTextField2; private JTextField jTextField3; private JLabel jLabel3; private JLabel jLabel2; private JButton jButton0; public MainFrame() { initComponents(); } private void initComponents() { setLayout(new GroupLayout()); add(getJLabel0(), new Constraints(new Leading(22, 32, 10, 10), new Leading(36, 24, 12, 12))); add(getJTextField0(), new Constraints(new Leading(66, 219, 10, 10), new Leading(37, 23, 12, 12))); add(getJLabel1(), new Constraints(new Leading(22, 28, 12, 12), new Leading(78, 23, 12, 12))); add(getJTextField1(), new Constraints(new Leading(66, 218, 12, 12), new Leading(78, 12, 12))); add(getJTextField2(), new Constraints(new Leading(66, 218, 12, 12), new Leading(121, 12, 12))); add(getJLabel3(), new Constraints(new Leading(22, 12, 12), new Leading(161, 22, 12, 12))); add(getJLabel2(), new Constraints(new Leading(22, 12, 12), new Leading(121, 22, 12, 12))); add(getJComboBox0(), new Constraints(new Leading(109, 10, 10), new Leading(202, 12, 12))); add(getJLabel4(), new Constraints(new Leading(89, 10, 10), new Leading(179, -8, 10, 10))); add(getJButton0(), new Constraints(new Leading(17, 10, 10), new Leading(202, 12, 12))); add(getJTextField3(), new Constraints(new Leading(66, 218, 12, 12), new Leading(157, 23, 10, 10))); add(getJLabel5(), new Constraints(new Leading(56, 10, 10), new Leading(265, 10, 10))); add(getJLabel6(), new Constraints(new Leading(137, 12, 12), new Leading(12, 12, 12))); setSize(321, 314); } private JLabel getJLabel6() { if (jLabel6 == null) { jLabel6 = new JLabel(); jLabel6.setText("复利计算"); } return jLabel6; } private JLabel getJLabel5() { if (jLabel5 == null) { jLabel5 = new JLabel(); jLabel5.setText("备注：要求什么哪里就不要你填"); } return jLabel5; } private JLabel getJLabel4() { if (jLabel4 == null) { jLabel4 = new JLabel(); jLabel4.setText("要求什么就在哪里就不用写"); } return jLabel4; } private JComboBox getJComboBox0() { if (jComboBox0 == null) { jComboBox0 = new JComboBox(); jComboBox0.setModel(new DefaultComboBoxModel(new Object[] { "复利计算", "求本金", "求利息", "求年限" })); jComboBox0.setDoubleBuffered(false); jComboBox0.setBorder(null); } return jComboBox0; } private JButton getJButton0() { if (jButton0 == null) { jButton0 = new JButton(); jButton0.setText("计算"); jButton0.addMouseListener(new MouseAdapter() { public void mouseClicked(MouseEvent event) { jButton0MouseMouseClicked(event); } }); } return jButton0; } private JLabel getJLabel2() { if (jLabel2 == null) { jLabel2 = new JLabel(); jLabel2.setText("年限"); } return jLabel2; } private JLabel getJLabel3() { if (jLabel3 == null) { jLabel3 = new JLabel(); jLabel3.setText("总额"); } return jLabel3; } private JTextField getJTextField3() { if (jTextField3 == null) { jTextField3 = new JTextField(); } return jTextField3; } private JTextField getJTextField2() { if (jTextField2 == null) { jTextField2 = new JTextField(); } return jTextField2; } private JTextField getJTextField1() { if (jTextField1 == null) { jTextField1 = new JTextField(); } return jTextField1; } private JLabel getJLabel1() { if (jLabel1 == null) { jLabel1 = new JLabel(); jLabel1.setText("利息"); } return jLabel1; } private JTextField getJTextField0() { if (jTextField0 == null) { jTextField0 = new JTextField(); } return jTextField0; } private JLabel getJLabel0() { if (jLabel0 == null) { jLabel0 = new JLabel(); jLabel0.setText("本金"); } return jLabel0; } private static void installLnF() { try { String lnfClassname = PREFERRED_LOOK_AND_FEEL; if (lnfClassname == null) lnfClassname = UIManager.getCrossPlatformLookAndFeelClassName(); UIManager.setLookAndFeel(lnfClassname); } catch (Exception e) { System.err.println("Cannot install " + PREFERRED_LOOK_AND_FEEL + " on this platform:" + e.getMessage()); } } /** * Main entry of the class. * Note: This class is only created so that you can easily preview the result at runtime. * It is not expected to be managed by the designer. * You can modify it as you like. */ public static void main(String[] args) { installLnF(); SwingUtilities.invokeLater(new Runnable() { public void run() { MainFrame frame = new MainFrame(); frame.setDefaultCloseOperation(MainFrame.EXIT_ON_CLOSE); frame.setTitle("MainFrame"); frame.getContentPane().setPreferredSize(frame.getSize()); frame.pack(); frame.setLocationRelativeTo(null); frame.setVisible(true); } }); } Fuli f =new Fuli(); Benjin b =new Benjin(); Lilv l = new Lilv(); Nianxian n = new Nianxian(); private JComboBox jComboBox0; private JLabel jLabel4; private JLabel jLabel5; private JLabel jLabel6; private static final String PREFERRED_LOOK_AND_FEEL = "javax.swing.plaf.metal.MetalLookAndFeel"; private void jButton0MouseMouseClicked(MouseEvent event) { String p = this.jTextField0.getText(); String i = this.jTextField1.getText(); String year = this.jTextField2.getText(); String sum = this.jTextField3.getText(); if(jComboBox0.getSelectedItem()=="复利计算"){ f.calculate(p, i, year); this.jTextField3.setText(f.sum); } if(jComboBox0.getSelectedItem()=="求本金"){ b.calculate(sum, i, year); this.jTextField0.setText(b.p); } if(jComboBox0.getSelectedItem()=="求利息"){ l.calculate(p, sum, year); this.jTextField1.setText(l.i); } if(jComboBox0.getSelectedItem()=="求年限"){ n.calculate(p, i, sum); this.jTextField2.setText(n.year); } } } package com.zhadan.calculate; import java.text.DecimalFormat; public class Fuli { double sum2; public String sum; public void calculate(String p2,String i2,String year2){ double p = Double.parseDouble(p2); double i = Double.parseDouble(i2); int year = Integer.parseInt(year2); for(int j=1;j<=year;j++){ p=p+p*i; } DecimalFormat df=new DecimalFormat("0.0"); sum2=p; sum=String.valueOf(df.format(sum2)); } } package com.zhadan.calculate; import java.text.DecimalFormat; public class Benjin { double p2; public String p; public void calculate(String sum2,String i2,String year2){ double sum = Double.parseDouble(sum2); double i = Double.parseDouble(i2); int year = Integer.parseInt(year2); i=1+i; for(int j=1;j<=year;j++){ sum=sum/i; } DecimalFormat df=new DecimalFormat("0.0"); Math.round(sum); p2=sum; p=String.valueOf(df.format(p2)); } } package com.zhadan.calculate; import java.text.DecimalFormat; public class Lilv { double i2; public String i; public void calculate(String p2,String sum2,String year2){ double p = Double.parseDouble(p2); double sum = Double.parseDouble(sum2); double year = Integer.parseInt(year2); DecimalFormat df=new DecimalFormat("0.0"); i2=Math.pow(sum/p, 1/year)-1; i=String.valueOf(df.format(i2)); } } package com.zhadan.calculate; public class Nianxian { int year2=0; public String year; public void calculate(String p2,String i2,String sum2){ double p = Double.parseDouble(p2); double i = Double.parseDouble(i2); double sum = Double.parseDouble(sum2); while(p<sum){ for(int j=1;j<100;j++);{ p=p*(1+i); year2++; } } year=String.valueOf(year2); System.out.println(year); } }
队友谭宇森：http://www.cnblogs.com/dalaotan/p/5392039.html