package fuli_4; import java.awt.Color; import java.awt.event.KeyAdapter; import java.awt.event.KeyEvent; import java.awt.event.MouseAdapter; import java.awt.event.MouseEvent; import java.text.DecimalFormat; import java.text.NumberFormat; import javax.swing.DefaultComboBoxModel; import javax.swing.JButton; import javax.swing.JComboBox; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.JTextField; import javax.swing.SwingUtilities; import javax.swing.UIManager; import javax.swing.border.LineBorder; import org.dyno.visual.swing.layouts.Constraints; import org.dyno.visual.swing.layouts.GroupLayout; import org.dyno.visual.swing.layouts.Leading; //VS4E -- DO NOT REMOVE THIS LINE! public class fuli_4 extends JFrame { private static final long serialVersionUID = 1L; private JLabel jLabel0; private JLabel jLabel1; private JPanel jPanel1; private JPanel jPanel0; private JLabel jLabel2; private JButton jButton4; private JLabel jLabel3; JTextField jTextField0; JTextField jTextField1; JTextField jTextField2; JTextField jTextField3; private static final MouseEvent event2 = null; private JComboBox jComboBox0; private JComboBox jComboBox1; private JButton jButton1; private JLabel jLabel4; private JLabel jLabel6; private JTextField jTextField4; private JLabel jLabel5; private JLabel jLabel7; private JLabel jLabel8; JLabel jLabel9; private static final String PREFERRED_LOOK_AND_FEEL = "javax.swing.plaf.metal.MetalLookAndFeel"; public fuli_4() { initComponents(); } private void initComponents() { setLayout(new GroupLayout()); add(getJPanel0(), new Constraints(new Leading(9, 304, 10, 10), new Leading(80, 361, 10, 10))); add(getJComboBox1(), new Constraints(new Leading(23, 10, 10), new Leading(19, 10, 10))); setSize(320, 449); } private JLabel getJLabel9() { if (jLabel9 == null) { jLabel9 = new JLabel(); jLabel9.setText(null); jLabel9.setFont(new java.awt.Font("Dialog", 0, 11)); jLabel9.setForeground(Color.red); } return jLabel9; } private JLabel getJLabel8() { if (jLabel8 == null) { jLabel8 = new JLabel(); jLabel8.setText(null); //设置字体大小，1是粗体，0是正常 jLabel8.setFont(new java.awt.Font("Dialog", 0, 11)); //设置字体颜色 jLabel8.setForeground(Color.red); } return jLabel8; } private JLabel getJLabel7() { if (jLabel7 == null) { jLabel7 = new JLabel(); jLabel7.setText(null); jLabel7.setFont(new java.awt.Font("Dialog", 0, 11)); jLabel7.setForeground(Color.red); } return jLabel7; } private JLabel getJLabel5() { if (jLabel5 == null) { jLabel5 = new JLabel(); jLabel5.setText(null); jLabel5.setFont(new java.awt.Font("Dialog", 0, 11)); jLabel5.setForeground(Color.red); } return jLabel5; } private JLabel getJLabel6() { if (jLabel6 == null) { jLabel6 = new JLabel(); jLabel6.setText(null); } return jLabel6; } private JLabel getJLabel4() { if (jLabel4 == null) { jLabel4 = new JLabel(); jLabel4.setText("%"); } return jLabel4; } private JButton getJButton1() { if (jButton1 == null) { jButton1 = new JButton(); jButton1.setText("确定"); jButton1.addMouseListener(new MouseAdapter() { public void mouseClicked(MouseEvent event) { jButton1MouseMouseClicked(event); } }); } return jButton1; } private JComboBox getJComboBox1() { if (jComboBox1 == null) { jComboBox1 = new JComboBox(); jComboBox1.setModel(new DefaultComboBoxModel(new Object[] { "复利计算", "单利计算" })); jComboBox1.setDoubleBuffered(false); jComboBox1.setBorder(null); jComboBox1.addMouseListener(new MouseAdapter() { }); } return jComboBox1; } private JComboBox getJComboBox0() { if (jComboBox0 == null) { jComboBox0 = new JComboBox(); jComboBox0.setModel(new DefaultComboBoxModel(new Object[] { "终值计算", "本金计算" ,"年限计算","利率计算","基金定投","等额本息还款"})); jComboBox0.setDoubleBuffered(false); jComboBox0.setBorder(null); jComboBox0.addMouseListener(new MouseAdapter() { }); } return jComboBox0; } private JTextField getJTextField3() { if (jTextField3 == null) { jTextField3 = new JTextField(10); } return jTextField3; } private JTextField getJTextField2() { if (jTextField2 == null) { jTextField2 = new JTextField(); jTextField2.addKeyListener(new KeyAdapter(){ public void keyTyped(KeyEvent e) { jLabel7.setText(null); int keyChar = e.getKeyChar(); if (keyChar >= KeyEvent.VK_0 && keyChar <= KeyEvent.VK_9||keyChar == '.') { } else { e.consume(); // 关键，屏蔽掉非法输入 jLabel7.setText("输入有误，请输入数字"); } } }); } return jTextField2; } private JTextField getJTextField1() { if (jTextField1 == null) { jTextField1 = new JTextField(10); // 限制只能输入数字 jTextField1.addKeyListener(new KeyAdapter() { public void keyTyped(KeyEvent e) { jLabel8.setText(null); int keyChar = e.getKeyChar(); if (keyChar >= KeyEvent.VK_0 && keyChar <= KeyEvent.VK_9||keyChar == '.') { } else { e.consume(); // 关键，屏蔽掉非法输入 jLabel8.setText("输入有误，请输入数字"); } } }); } return jTextField1; } private JTextField getJTextField0() { if (jTextField0 == null) { jTextField0 = new JTextField(10); // 限制只能输入数字 jTextField0.addKeyListener(new KeyAdapter() { public void keyTyped(KeyEvent e) { jLabel5.setText(null); int keyChar = e.getKeyChar(); if (keyChar >= KeyEvent.VK_0 && keyChar <= KeyEvent.VK_9||keyChar == '.') { } else { e.consume(); // 关键，屏蔽掉非法输入 jLabel5.setText("输入有误，请输入数字"); } } }); } return jTextField0; } private JLabel getJLabel3() { if (jLabel3 == null) { jLabel3 = new JLabel(); jLabel3.setText("终值"); } return jLabel3; } private JButton getJButton4() { if (jButton4 == null) { jButton4 = new JButton(); jButton4.setText("确定"); jButton4.addMouseListener(new MouseAdapter() { public void mouseClicked(MouseEvent event) { jButton4MouseMouseClicked(event); } }); } return jButton4; } private JLabel getJLabel2() { if (jLabel2 == null) { jLabel2 = new JLabel(); jLabel2.setText("年利率"); } return jLabel2; } private JPanel getJPanel0() { if (jPanel0 == null) { jPanel0 = new JPanel(); jPanel0.setBorder(new LineBorder(Color.red, 1, false)); jPanel0.setLayout(new GroupLayout()); jPanel0.add(getJComboBox0(), new Constraints(new Leading(14, 10, 10), new Leading(20, 10, 10))); jPanel0.add(getJPanel1(), new Constraints(new Leading(22, 261, 10, 10), new Leading(74, 264, 10, 10))); jPanel0.add(getJButton1(), new Constraints(new Leading(155, 10, 10), new Leading(20, 12, 12))); } return jPanel0; } private JPanel getJPanel1() { if (jPanel1 == null) { jPanel1 = new JPanel(); jPanel1.setBorder(new LineBorder(Color.black, 1, false)); jPanel1.setLayout(new GroupLayout()); jPanel1.add(getJLabel0(), new Constraints(new Leading(14, 10, 10), new Leading(26, 10, 10))); jPanel1.add(getJLabel1(), new Constraints(new Leading(14, 12, 12), new Leading(113, 10, 10))); jPanel1.add(getJLabel3(), new Constraints(new Leading(14, 12, 12), new Leading(215, 10, 10))); jPanel1.add(getJLabel6(), new Constraints(new Leading(56, 12, 12), new Leading(215, 12, 12))); jPanel1.add(getJTextField0(), new Constraints(new Leading(86, 168, 10, 10), new Leading(26, 12, 12))); jPanel1.add(getJTextField2(), new Constraints(new Leading(86, 168, 12, 12), new Leading(68, 12, 12))); jPanel1.add(getJTextField1(), new Constraints(new Leading(86, 168, 12, 12), new Leading(111, 12, 12))); jPanel1.add(getJTextField3(), new Constraints(new Leading(90, 164, 12, 12), new Leading(215, 12, 12))); jPanel1.add(getJLabel4(), new Constraints(new Leading(64, 26, 10, 10), new Leading(70, 12, 12))); jPanel1.add(getJButton4(), new Constraints(new Leading(140, 12, 12), new Leading(162, 10, 10))); jPanel1.add(getJLabel5(), new Constraints(new Leading(86, 168, 12, 12), new Leading(48, 10, 10))); jPanel1.add(getJLabel7(), new Constraints(new Leading(86, 168, 12, 12), new Leading(92, 10, 10))); jPanel1.add(getJLabel8(), new Constraints(new Leading(86, 168, 12, 12), new Leading(137, 12, 12))); jPanel1.add(getJLabel2(), new Constraints(new Leading(11, 12, 12), new Leading(70, 12, 12))); jPanel1.add(getJLabel9(), new Constraints(new Leading(90, 160, 12, 12), new Leading(239, 12, 12))); } return jPanel1; } private JLabel getJLabel1() { if (jLabel1 == null) { jLabel1 = new JLabel(); jLabel1.setText("年限"); } return jLabel1; } 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() { fuli_4 frame = new fuli_4(); frame.setDefaultCloseOperation(fuli_4.EXIT_ON_CLOSE); frame.setTitle("复利、单利计算 "); frame.getContentPane().setPreferredSize(frame.getSize()); frame.pack(); frame.setLocationRelativeTo(null); frame.setVisible(true); } }); } //终值，本金 private void jButton1MouseMouseClicked(MouseEvent event) { if (jComboBox0.getSelectedItem() == "终值计算") { jLabel6.setText(null); jLabel4.setText("%"); this.jLabel0.setText("本金"); this.jLabel2.setText("年利率"); this.jLabel3.setText("终值"); this.jLabel1.setText("年限"); } else if (jComboBox0.getSelectedItem() == "本金计算") { jLabel6.setText(null); jLabel4.setText("%"); this.jLabel0.setText("终值"); this.jLabel3.setText("本金"); this.jLabel2.setText("年利率"); this.jLabel1.setText("年限"); } else if (jComboBox0.getSelectedItem() == "年限计算") { jLabel6.setText(null); jLabel4.setText("%"); this.jLabel0.setText("本金"); this.jLabel1.setText("终值"); this.jLabel2.setText("年利率"); this.jLabel3.setText("年限"); } else if (jComboBox0.getSelectedItem() == "利率计算") { jLabel4.setText(null); jLabel6.setText("%"); this.jLabel0.setText("本金"); this.jLabel3.setText("年利率"); this.jLabel2.setText("终值"); this.jLabel1.setText("年限"); } else if (jComboBox0.getSelectedItem() == "基金定投") { jLabel6.setText(null); jLabel4.setText("%"); this.jLabel0.setText("每期定投"); this.jLabel2.setText(" 收益率"); this.jLabel3.setText("预期收益"); this.jLabel1.setText("定投期数(年)"); } else if (jComboBox0.getSelectedItem() == "等额本息还款") { jLabel6.setText(null); jLabel4.setText("%"); this.jLabel0.setText("贷款"); this.jLabel2.setText("年利率"); this.jLabel3.setText("每月还款"); this.jLabel1.setText("期限(月)"); } } //计算 public void run(){ try { double f = 0; // 当输入值为空时，计算结果返回0 if (jTextField0.getText().equals("") || jTextField1.getText().equals("")|| jTextField2.getText().equals("")) { jLabel5.setText("请输入>0的数字"); jLabel7.setText("请输入>0的数字"); jLabel8.setText("请输入>0的数字"); jLabel9.setText("请正确输入数据在执行运算"); } else { NumberFormat currencyformatter = NumberFormat.getCurrencyInstance(); // 字符串转化为数字 float p = Float.parseFloat(jTextField0.getText()); float r = Float.parseFloat(jTextField2.getText()); float n = Float.parseFloat(jTextField1.getText()); if (p <= 0) { jLabel5.setText("请输入>0的数字"); jLabel9.setText("请正确输入数据在执行运算"); } if (n <= 0) { jLabel8.setText("请输入>0的数字"); jLabel9.setText("请正确输入数据在执行运算"); } if (r <= 0) { jLabel7.setText("请输入>0的数字"); jLabel9.setText("请正确输入数据在执行运算"); } if(p>0&&n>0&&r>0){ if (jComboBox1.getSelectedItem() == "复利计算") { if (jComboBox0.getSelectedItem() == "终值计算") { f = p * Math.pow((1 + 0.01 * r), n); } if (jComboBox0.getSelectedItem() == "本金计算") { f = p / Math.pow((1 + 0.01 * r), n); } else if (jComboBox0.getSelectedItem() == "年限计算") { f = (Math.log(n / p)) / (Math.log(1 + 0.01 * r)); } else if (jComboBox0.getSelectedItem() == "利率计算") { f = 100 * (Math.pow(r / p, 1d / n) - 1); } else if (jComboBox0.getSelectedItem() == "基金定投") { f = p * (1 + 0.01 * r) * (-1 + Math.pow(1 + 0.01 * r, n)) / (0.01 * r); } else if (jComboBox0.getSelectedItem() == "等额本息还款") { f = p * ((0.01 * r / 12) * Math.pow((1 + 0.01 * r / 12), n)) / (Math.pow((1 + 0.01 * r / 12), n) - 1); } } else { if (jComboBox0.getSelectedItem() == "终值计算") { f = p * (1 + 0.01 * r * n); } else if (jComboBox0.getSelectedItem() == "本金计算") { f = p / (1 + 0.01 * r * n); } else if (jComboBox0.getSelectedItem() == "年限计算") { f = ((n / p) - 1) / (0.01 * r); } else if (jComboBox0.getSelectedItem() == "利率计算") { f = 100 * (((r / p) - 1) / n); } } DecimalFormat df = new DecimalFormat("0.00"); String db = df.format(f); jTextField3.setText(String.valueOf(db)); } } } catch (Exception e) { System.out.println(e.getMessage()); } } private void jButton4MouseMouseClicked(MouseEvent event) { run(); } }
运行结果：（1）基金定投
（2）等额本息还款
（3）当输入为空时，提示“请输入>0的数”
（4）当输入为非数字时，提示“请输入数字”
（5）当除数为0，即输入为0时，提示“请输入>0的数字”
