复利软件单利及期望值的实现

package ch1;

 

import java.awt.BorderLayout;

import java.awt.Component;

import java.awt.Dimension;

import java.awt.FlowLayout;

import java.awt.Graphics;

import java.awt.GridLayout;

import java.awt.Toolkit;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.image.BufferedImage;

import java.io.File;

import java.io.IOException;

import java.text.NumberFormat;

 

import javax.imageio.ImageIO;

import javax.swing.ImageIcon;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JOptionPane;

import javax.swing.JPanel;

import javax.swing.JScrollPane;

import javax.swing.JTextArea;

import javax.swing.JTextField;

 

import org.omg.CosNaming.NamingContextExtPackage.AddressHelper;

 

 

 

 

 

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();

    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);

 

         

        add(leftpanel);

        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);

 

    }

 

    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;

            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/(Math.pow(1 + rate, year));

                        year = year + 1;

                    }

                     

                    output="本金"+currencyformatter.format(principal) + " ";

                    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 * Math.pow(1 + rate, year);

                        output += String.valueOf(year) + " "

                                + currencyformatter.format(amount) + " ";

                        year = year + 1;

                    }

 

                    text.setText(output);

                }

                else{

                    JOptionPane.showMessageDialog(null, "本金和期望值输入一个即可");

                }

            }

             

        }

    }

 

    private class c2ActionEventHander implements ActionListener {

        public void actionPerformed(ActionEvent e) {

            b1.setText("");

            b2.setText("");

            b3.setText("");

            b4.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) + " ";

                    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) + " "

                                + currencyformatter.format(amount) + " ";

                        year = year + 1;

                    }

 

                    text.setText(output);

                }

                else{

                    JOptionPane.showMessageDialog(null, "本金和期望值输入一个即可");

                }

            }

             

        }

    }

     

     

     

 

 

    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

         

    }

}