0317复利软件更新

package Fuli;

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.GridLayout;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.text.NumberFormat;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JRadioButtonMenuItem;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;


public class Fuli extends JFrame {

    private static final long serialVersionUID = 3347254632537686808L;
    private JLabel a1; // 标签
    private JLabel a2;
    private JLabel a3;
    private JLabel a4;
    private JTextField b1; // 本金
    private JTextField b2; // 利率
    private JTextField b3; // 年份
    private JTextField b4; // 期望值
    private JButton c1;
    private JButton c2;
    private JButton c3;

    private JTextArea text; // 显示纯文本的多行区域

    private JPanel toolbar = new JPanel();

    private JPanel toolbar2 = new JPanel();
    boolean isadd = false;
    JRadioButtonMenuItem mrButton = new JRadioButtonMenuItem("每年添加一定的本金");

    public Fuli() {
        setTitle("复利存款应用程序");
        creatComponents(); // 创建零件
        layoutComponents(); // 设计零件
        registerHandlers(); // 鼠标监控
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        pack();
    }

    private void creatComponents() {
        a1 = new JLabel("本 金 ");
        a2 = new JLabel("年利率 ");
        a3 = new JLabel("年 数 ");
        a4 = new JLabel("期望值");
        b1 = new JTextField(10);
        b2 = new JTextField(10);
        b3 = new JTextField(10);
        b4 = new JTextField(10);
        c1 = new JButton("复利");
        c2 = new JButton("清除");
        c3 = new JButton("单利");
        text = new JTextArea();

    }

    private void layoutComponents() {
        setLayout(new FlowLayout());
        JPanel panel1 = new JPanel();
        panel1.add(a1);
        panel1.add(b1);
        JPanel panel2 = new JPanel();
        panel2.add(a2);
        panel2.add(b2);
        JPanel panel3 = new JPanel();
        panel3.add(a3);
        panel3.add(b3);
        JPanel panel6 = new JPanel();
        panel6.add(a4);
        panel6.add(b4);

        JPanel leftpanel = new JPanel(new GridLayout(3, 1));
        leftpanel.add(panel1);
        leftpanel.add(panel2);
        leftpanel.add(panel3);

        leftpanel.add(panel6);
        JScrollPane panel5 = new JScrollPane(text);
        panel5.setPreferredSize(new Dimension(400, 200));

        toolbar.add(c1);
        toolbar.add(c2);
        toolbar.add(c3);
        toolbar2.add(mrButton);

        add(leftpanel);
        // add(mrButton);
        add(toolbar2, BorderLayout.NORTH);
        add(panel5);
        add(toolbar, BorderLayout.EAST);
    }

    private void registerHandlers() {
        c1ActionEventHander hander1 = new c1ActionEventHander();
        c1.addActionListener(hander1);
        c2ActionEventHander hander2 = new c2ActionEventHander();
        c2.addActionListener(hander2);
        c3ActionEventHander hander3 = new c3ActionEventHander();
        c3.addActionListener(hander3);
        mrButtonActionEventHander hander4 = new mrButtonActionEventHander();
        mrButton.addActionListener(hander4);

    }

    private class c1ActionEventHander implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            double principal;
            double amount;
            double rate;
            int n;
            NumberFormat currencyformatter = NumberFormat.getCurrencyInstance(); // 字符串转化为数字
            String output = "年" + "/" + "复利存款";
//            int year = 1;
//
//        //    principal = Double.parseDouble(b1.getText()); // b1本金
//            rate = Double.parseDouble(b2.getText()); // b2利率
//            n = Integer.parseInt(b3.getText()); // b3年份
//            amount = Double.parseDouble(b4.getText()); // b4期望值
            int year = 1;
//            rate = Double.parseDouble(b2.getText());
//            n = Integer.parseInt(b3.getText());
                
            if (b1.getText().equals("")&& b2.getText() != null
                    && b3.getText() != null && b4.getText() != null) {
                
                rate = Double.parseDouble(b2.getText());
                n = Integer.parseInt(b3.getText());
                    amount = Double.parseDouble(b4.getText());
                    principal = 0;
                    while (year <= n) {
                        principal = amount / (Math.pow(1 + rate, year));
                        year = year + 1;
                    }

                    output = "本金" + currencyformatter.format(principal) + "\n";
                    text.setText(output);
                
            }

            else if (b2.getText().equals("") && b1.getText() != null
                    && b3.getText() != null && b4.getText() != null) // 求利率
            {
                principal = Double.parseDouble(b1.getText()); // b1本金
                rate =0;
                n = Integer.parseInt(b3.getText()); // b3年份
                amount = Double.parseDouble(b4.getText()); // b4期望值
                rate = java.lang.StrictMath.pow(amount / principal, 1.0 / n) - 1;
                output = "利率" + rate + "\n";
                text.setText(output);
            }

            else if (b3.getText().equals("") && b1.getText() != null
                    && b2.getText() != null && b4.getText() != null) // 求年份
            {
                principal = Double.parseDouble(b1.getText()); // b1本金
                amount = Double.parseDouble(b4.getText()); // b4期望值
                rate = Double.parseDouble(b2.getText());
                int n2=1;
                  while(principal<amount){
                      principal=principal * Math.pow(1 + rate, n2);
                      n2+=1;
                  }
                  output = "至少年数" + n2+"\n";
                  text.setText(output);
            }

            else if (b4.getText().equals("") && b1.getText() != null
                    && b3.getText() != null && b2.getText() != null) // 求期望值
            {
                rate = Double.parseDouble(b2.getText());
                n = Integer.parseInt(b3.getText());
                principal = Double.parseDouble(b1.getText()); // b1本金
                while (year <= n) {
                        amount = principal * Math.pow(1 + rate, year);
                        output += String.valueOf(year) + "\t\t\t"
                                + currencyformatter.format(amount) + "\n";
                        year = year + 1;
                    }

                    text.setText(output);
            }
        }

    }

    private class c2ActionEventHander implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            b1.setText("");
            b2.setText("");
            b3.setText("");
            text.setText("");
        }
    }

    private class c3ActionEventHander implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            double principal;
            double amount;
            double rate;
            int n;
            NumberFormat currencyformatter = NumberFormat.getCurrencyInstance();
            String output = "年" + "/" + "单利存款";
            int year = 1;

            rate = Double.parseDouble(b2.getText());
            n = Integer.parseInt(b3.getText());
            if (b1.getText().equals("")) {
                if (b4.getText().equals("")) {
                    JOptionPane.showMessageDialog(null, "请输入本金或者期望值");

                } else {
                    amount = Double.parseDouble(b4.getText());
                    principal = 0;
                    while (year <= n) {
                        principal = amount / (1 + rate * year);
                        year = year + 1;
                    }

                    output = "本金" + currencyformatter.format(principal) + "\n";
                    text.setText(output);
                }
            } else {
                principal = Double.parseDouble(b1.getText()); // 字符串转化为数字

                if (b4.getText().equals("")) {
                    while (year <= n) {
                        amount = principal * (1 + rate * year);
                        output += String.valueOf(year) + "\t\t\t"
                                + currencyformatter.format(amount) + "\n";
                        year = year + 1;
                    }

                    text.setText(output);
                } else {
                    JOptionPane.showMessageDialog(null, "本金和期望值输入一个即可");
                }
            }

        }
    }

    private class mrButtonActionEventHander implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            if (isadd == false) {
                isadd = true;
            }
            if (isadd == true) {
                isadd = false;
            }
        
        }
    }

    public static void main(String[] args) {

        int Windowswidth = 500;
        int Windowsheight = 400;
        Fuli frame = new Fuli();
        frame.setVisible(true);
        frame.setSize(Windowswidth, Windowsheight);
        frame.setResizable(false);
        int width = Toolkit.getDefaultToolkit().getScreenSize().width;
        int height = Toolkit.getDefaultToolkit().getScreenSize().height;
        frame.setLocation((width - Windowswidth) / 2,
                (height - Windowsheight) / 2); // 窗口居中
    }
}