0311软件工程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) + "\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 * Math.pow(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 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) + "\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");
}
}

}
}

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

}
}