复利计算器3.1

此版本复利计算器 基本实现了所要求的全部功能，并对输入的数据进行出错处理了，而且对代码进行了整合与复用
package JSQ

import java.awt.EventQueue;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.ButtonGroup;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JTextField;
import javax.swing.JButton;

import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.Font;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.Color;

import javax.swing.JComboBox;
import javax.swing.DefaultComboBoxModel;

import java.awt.event.ItemListener;
import java.awt.event.ItemEvent;

import javax.swing.JRadioButton;


public class FuLiJiSuanQi extends JFrame {

    /**
     * 
     */
    private static final long serialVersionUID = 1L;
    private JPanel contentPane;
    private JTextField t2;
    private JTextField t3;
    private JTextField t1;
    private JTextField t4;
    private JLabel L3;
    double capital,year,rate,sum;
    double t_1,t_2,t_3;
    int flag=1;
    private JRadioButton r1;
    private JRadioButton r2;
    KeyAdapter keyAdapter=new KeyAdapter(){  
        public void keyTyped(KeyEvent e) {  
            int keyChar =e.getKeyChar();                 
            if((keyChar>=KeyEvent.VK_0 &&keyChar<=KeyEvent.VK_9)||keyChar==KeyEvent.VK_PERIOD){
            }
            else
                e.consume();
        }
    };
    /**
     * Launch the application.
     */
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    FuLiJiSuanQi frame = new FuLiJiSuanQi();
                    frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    /**
     * Create the frame.
     */
    @SuppressWarnings({ "unchecked", "rawtypes" })
    public FuLiJiSuanQi() {
        setTitle("u590Du5229u8BA1u7B97u56683.1");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setBounds(100, 100, 474, 369);
        contentPane = new JPanel();
        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
        setContentPane(contentPane);
        contentPane.setLayout(null);
        
        final JLabel L1 = new JLabel("u5B58u6B3E(u4E07):");
        L1.setFont(new Font("Microsoft JhengHei", Font.PLAIN, 16));
        L1.setBounds(62, 121, 90, 15);
        contentPane.add(L1);
        
        t1 = new JTextField();
        t1.setBounds(166, 115, 173, 21);
        contentPane.add(t1);
        t1.setColumns(10);
        t1.addKeyListener(keyAdapter); 
        L3 = new JLabel("u5229u7387( %):");
        L3.setFont(new Font("Microsoft JhengHei", Font.PLAIN, 16));
        L3.setBounds(62, 186, 81, 15);
        contentPane.add(L3);
        
        t2 = new JTextField();
        t2.setBounds(166, 149, 173, 21);
        contentPane.add(t2);
        t2.setColumns(10);
        t2.addKeyListener(keyAdapter);  
        
        final JLabel L2 = new JLabel("u672Cu606F(u4E07):");
        L2.setFont(new Font("Microsoft JhengHei", Font.PLAIN, 16));
        L2.setBounds(62, 155, 104, 15);
        contentPane.add(L2);
        
        t3 = new JTextField();
        t3.setBounds(166, 180, 173, 21);
        contentPane.add(t3);
        t3.setColumns(10);
        t3.addKeyListener(keyAdapter);  
        
        final JButton btnNewButton = new JButton("u5E74u9650(u5E74)");
        t4 = new JTextField();
        t4.setEnabled(false);
        t4.setForeground(new Color(127, 255, 212));
        t4.setBounds(166, 237, 173, 21);
        contentPane.add(t4);
        t4.setColumns(10);
        final JComboBox comboBox = new JComboBox();
        comboBox.addItemListener(new ItemListener() {
            @Override
            public void itemStateChanged(ItemEvent e) {
                if(comboBox.getSelectedItem().toString().equals("u4F30u7B97u5B58u671F"))
                {
                    flag=1;
                    r1.setEnabled(true);
                    L1.setText("u5B58u6B3E(u4E07):");
                    L2.setText("u672Cu606F(u4E07):");
                    L3.setText("u5229u7387(%):");
                    btnNewButton.setText("u5E74u9650(u5E74)");
                    emptyJTextField();
                }
                else if(comboBox.getSelectedItem().toString().equals("u4F30u7B97u5B58u989D")) {
                    flag=2;
                    r1.setEnabled(true);
                    L1.setText("u672Cu606F(u4E07)");
                    L2.setText("u5E74u9650(u5E74):");
                    L3.setText("u5229u7387(%):");
                    btnNewButton.setText("u5B58u6B3E(u4E07)");
                    emptyJTextField();
                }
                else if(comboBox.getSelectedItem().toString().equals("u4F30u7B97u5229u7387")) {
                    flag=3;
                    r1.setEnabled(true);
                    L1.setText("u5B58u6B3E(u4E07):");
                    L2.setText("u672Cu606F(u4E07):");
                    L3.setText("u5E74u9650(u5E74):");
                    btnNewButton.setText("u5229u7387(%)");
                    emptyJTextField();
                }
                else if(comboBox.getSelectedItem().toString().equals("u4F30u7B97u672Cu606F")){
                    flag=4;
                    r1.setEnabled(true);
                    L1.setText("u5B58u6B3E(u4E07):");
                    L2.setText("u5E74u9650(u5E74):");
                    L3.setText("u5229u7387(%):");
                    btnNewButton.setText("u672Cu606F(u4E07)");
                    emptyJTextField();
                }
                else {
                    flag=5;
                    r1.setEnabled(false);
                    r2.setSelected(isActive());
                    L1.setText("u8D37u6B3E(u4E07)");
                    L2.setText("u5E74u9650(u5E74):");
                    L3.setText("u5229u7387(%):");
                    btnNewButton.setText("u7B49u989Du6708u8FD8u6B3E(u4E07)");
                    emptyJTextField();
                }
            }
        });
        comboBox.setModel(new DefaultComboBoxModel(new String[] {"u4F30u7B97u5B58u671F", "u4F30u7B97u5B58u989D", 
                                            "u4F30u7B97u5229u7387","u4F30u7B97u672Cu606F", "u5206u671Fu8FD8u6B3E"}));
        comboBox.setBounds(53, 10, 113, 21);
        contentPane.add(comboBox);
        
        r1 = new JRadioButton("u5355u5229");
        r1.setSelected(true);
        r1.setBounds(53, 60, 59, 23);
        contentPane.add(r1);
        
        r2 = new JRadioButton("u590Du5229");
        r2.setBounds(114, 60, 71, 23);
        contentPane.add(r2);
        ButtonGroup group=new ButtonGroup();
        group.add(r1);
        group.add(r2);
        JLabel L = new JLabel("u529Fu80FD");
        L.setFont(new Font("Microsoft JhengHei", Font.PLAIN, 16));
        L.setBounds(10, 13, 54, 15);
        contentPane.add(L);
        btnNewButton.addMouseListener(new MouseAdapter() {
            @Override
            public void mouseClicked(MouseEvent e) {
                if (t1.getText().trim().equals("")||t2.getText().trim().equals("")
                                                ||t3.getText().trim().equals("")) {
                    JOptionPane.showMessageDialog(contentPane, "u8BF7u628Au6570u636Eu8F93u5165u5B8Cu6574");
                }
                else {
                    getJTextFieldValue();
                    if(r1.isSelected()){
                        calculate();
                    }
                    else {
                        calculate_2();
                    }
                }
            }
        });
        btnNewButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
            }
        });
        btnNewButton.setBounds(39, 236, 127, 23);
        contentPane.add(btnNewButton);
        
        JLabel label = new JLabel("u65B9u5F0F");
        label.setFont(new Font("Microsoft JhengHei", Font.PLAIN, 16));
        label.setBounds(10, 62, 54, 15);
        contentPane.add(label);
    }
    public void getJTextFieldValue() {
            t_1=Double.parseDouble(t1.getText());
            t_2=Double.parseDouble(t2.getText());
            t_3=Double.parseDouble(t3.getText());
    };
    public void  emptyJTextField() {
        t1.setText(null);
        t2.setText(null);
        t3.setText(null);
        t4.setText(null);
    }
    public void calculate() {
        switch (flag) {
        case 1:
            capital=t_1;
            sum=t_2;
            rate=t_3;
            year=(sum/capital-1)/(rate/100);
            t4.setText(Double.toString(year));
            break;
        case 2:
            sum=t_1;
            year=t_2;
            rate=t_3;
            capital=sum/(year*rate/100+1);
            t4.setText(Double.toString(capital));
            break;
        case 3:
            capital=t_1;
            sum=t_2;
            year=t_3;
            rate=(sum/capital-1)/year*100;
            t4.setText(Double.toString(rate));
            break;
        case 4:
            capital=t_1;
            year=t_2;
            rate=t_3;
            sum=capital*(1+rate/100*year);
            t4.setText(Double.toString(sum));
            break;
        default:
            break;
        }
    }
    public void  calculate_2() {
        switch (flag) {
        case 1:
            capital=t_1;
            sum=t_2;
            rate=t_3;
            year=Math.log(sum/capital)/Math.log(1+rate/100);
            t4.setText(Double.toString(year));
            break;
        case 2:
            sum=t_1;
            year=t_2;
            rate=t_3;
            capital=sum/Math.pow((1+rate/100),year);
            t4.setText(Double.toString(capital));
            break;
        case 3:
            capital=t_1;
            sum=t_2;
            year=t_3;
            rate=(Math.pow((sum/capital),1/year)-1)*100;
            t4.setText(Double.toString(rate));
            break;
        case 4:
            capital=t_1;
            year=t_2;
            rate=t_3;
            sum=capital*Math.pow((1+rate/100),year);
            t4.setText(Double.toString(sum));
            break;
        case 5:
            capital=t_1;
            year=t_2;
            rate=t_3;
            sum=capital*Math.pow((1+rate/1200),year*12)*(rate/1200)
                                /(Math.pow((1+rate/1200),year*12)-1);
            t4.setText(Double.toString(sum));
            break;
        default:
            break;
        }
    }
}