0414复利计算结对再升级
1.这次主要把界面弄好看点，更加方便，不再杂乱无章。
2.每次输入完数据后，会清除上一次的记录，但会保存到 投资记录 ，可以点击查看。
搭档：曾昱霖
博客园地址：http://www.cnblogs.com/Benjen/
package ch;
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Font;
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.AbstractButton;
import javax.swing.BorderFactory;
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 JLabel a1;
private JLabel a2;
private JLabel a3;
private JLabel a4;
private JTextField b1;
private JTextField b2;
private JTextField b3;
private JTextField b4;
private JButton c1;
private JButton c2;
private JButton c3;
private JTextArea text;
private JPanel leftpanel = new JPanel();
private AbstractButton leftpanelr= new JRadioButtonMenuItem("每年添加一定的本金");
public double[] a = new double[100];
public double[] b = new double[100];
int input = 0;
public fuli()
{
creatComponents() ;
layoutComponents();
registerHandlers();
setTitle("复利存款计算器");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
pack();
}
private void creatComponents()
{
a1=new JLabel("本 金 ");
a1.setFont(new Font("宋体",Font.BOLD,18));
a2=new JLabel("年利率 ");
a2.setFont(new Font("宋体",Font.BOLD,18));
a3=new JLabel("年 数 ");
a3.setFont(new Font("宋体",Font.BOLD,18));
a4=new JLabel("期望值 ");
a4.setFont(new Font("宋体",Font.BOLD,18));
b1=new JTextField(10);
b2=new JTextField(10);
b3=new JTextField(10);
b4=new JTextField(10);
c1=new JButton("计算");
c1.setFont(new Font("宋体",Font.BOLD,15));
c2=new JButton("清除");
c2.setFont(new Font("宋体",Font.BOLD,15));
c3=new JButton("投资记录");
c3.setFont(new Font("宋体",Font.BOLD,15));
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 panel4=new JPanel();
panel4.add(c1);
panel4.add(c2);
panel4.add(c3);
JPanel leftpanel=new JPanel(new GridLayout(5,2));
leftpanel.add(panel1);
leftpanel.add(panel2);
leftpanel.add(panel3);
leftpanel.add(panel6);
leftpanel.add(panel4);
JScrollPane panel5=new JScrollPane(text);
panel5.setPreferredSize(new Dimension(300,200));
add(leftpanel);
add(panel5);
}
private void registerHandlers() {
c1ActionEventHander hander1 = new c1ActionEventHander();
c1.addActionListener(hander1);
c2ActionEventHander hander2 = new c2ActionEventHander();
c2.addActionListener(hander2);
c3ActionEventHander hander4 = new c3ActionEventHander();
c3.addActionListener(hander4);
}
private class c1ActionEventHander implements ActionListener {
public void actionPerformed(ActionEvent e) {
double principal = 0;
double amount = 0;
double rate = 0;
int n = 0;
NumberFormat currencyformatter = NumberFormat.getCurrencyInstance(); // 字符串转化为数字
String output = "年" + "/" + "复利存款";
int year = 1;
int result;
if (b1.getText().equals("") && b2.getText() != null
&& b3.getText() != null && b4.getText() != null) { // 计算本金
try {
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);
}
catch (Exception e2) {
// TODO: handle exception
}
}
else if (b2.getText().equals("") && b1.getText() != null
&& b3.getText() != null && b4.getText() != null) // 求利率
{
try {
principal = Double.parseDouble(b1.getText()); // b1本金
n = Integer.parseInt(b3.getText()); // b3年份
amount = Double.parseDouble(b4.getText()); // b4期望值
} catch (Exception e2) {
// TODO: handle exception
}
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
{
try {
principal = Double.parseDouble(b1.getText()); // b1本金
amount = Double.parseDouble(b4.getText()); // b4期望值
rate = Double.parseDouble(b2.getText());
} catch (Exception e2) {
// TODO: handle exception
}
double year2 = Math.log(amount / principal) / Math.log(1 + rate);
output = "至少年数" + year2 + "\n";
text.setText(output);
}
else if (b4.getText().equals("") && b1.getText() != null
&& b3.getText() != null && b2.getText() != null) // 求期望值
{
try {
rate = Double.parseDouble(b2.getText());
n = Integer.parseInt(b3.getText());
principal = Double.parseDouble(b1.getText()); // b1本金
} catch (Exception e2) {
// TODO: handle exception
}
double tempprincipal = principal;
result = JOptionPane.showConfirmDialog(null, "是否每年进行投资？");
if (result == JOptionPane.YES_OPTION) {
amount=CalculateA(year,n,principal,rate,tempprincipal);
System.out.println("CalculateA(year,n,principal,rate,tempprincipal)"+year+n+principal+rate+tempprincipal);
output += String.valueOf(year) + "\t\t\t"
+ currencyformatter.format(amount) + "\n";
} else {
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);
int Isinfo = JOptionPane.showConfirmDialog(null, "是否投资？");
if (Isinfo == JOptionPane.YES_OPTION) {
a[input] = principal;
b[input] = amount;
input += 1;
}
} else if (b1.getText() != null && b4.getText() != null
&& b3.getText() != null && b2.getText() != null) {
JOptionPane.showMessageDialog(null, "请删除一个数据");
} else {
JOptionPane.showMessageDialog(null, "请增加数据");
}
}
public double CalculateA(int years2,int n2,double principal2,double rate2,double tempprincipal2){
double amount2 = 0;
while (years2 <= n2) {
amount2 = principal2 * Math.pow(1 + rate2, years2)
+ tempprincipal2;
years2 = years2 + 1;
}
return amount2;
}
}
public double CalculateA1(int years2,int n2,double principal2,double rate2,double tempprincipal2){
double amount2 = 0;
while (years2 <= n2) {
amount2 = principal2 * Math.pow(1 + rate2, years2)
+ tempprincipal2;
years2 = years2 + 1;
}
return amount2;
}
private double CalculateA(int year, int n, double principal, double rate,
double tempprincipal) {
// TODO 自动生成的方法存根
return 0;
}
private class c2ActionEventHander implements ActionListener {
public void actionPerformed(ActionEvent e) {
b1.setText("");
b2.setText("");
b3.setText("");
text.setText("");
}
}
public static void main(String[] args)
{
fuli frame=new fuli();
frame.setVisible(true);
int Windowswidth = 500;
int Windowsheight = 400;
int width = Toolkit.getDefaultToolkit().getScreenSize().width;
int height = Toolkit.getDefaultToolkit().getScreenSize().height;
frame.setResizable(false);
frame.setLocation((width - Windowswidth) / 2,
(height - Windowsheight) / 2); // 窗口居中
}
private class c3ActionEventHander implements ActionListener {
public void actionPerformed(ActionEvent e) {
String output = "交易记录：存入的本金/获得的收益";
int i = 0;
while (a[i] != 0) {
output = output + "\t\t" + a[i] + "/" + b[i] + "\n";
i += 1;
}
text.setText(output);
}
}
}
