第2章：财务应用程序：计算未来投资值 【对话框】

/**
* 财务应用程序：计算未来投资值。
* 读取投资总额、年利率和年数：
* 使用下面公式显示未来投资金额：
* futureInvestmentValue = investmentAmount * Math.pow((1 + annuallyInterestRate, numberOfYears*12)。
* 例如输入的投资金额为1000，年利率为3.25%，年数为1，那么未来投资额为1032.98。
* 下面是一个运行示例：
* ————————————————————————————————————————————
* | Enter investment amount: 1000            |
* | Enter monthly interest rate: 0.0425      |
* | Enter number of years: 1                 |
* | Accumulated value is 1647.8313602236476  |
* ————————————————————————————————————————————
*/
package Test;

import javax.swing.JOptionPane;

public class T213InputDialog {
public static void main(String[] args) {
String investmentAmountString = JOptionPane.showInputDialog("Enter investment amount: ");
double investmentAmount = Double.parseDouble(investmentAmountString);
String annuallyInterestRateString = JOptionPane.showInputDialog("Enter monthly interest rate: ");
double annuallyInterestRate = Double.parseDouble(annuallyInterestRateString);
String numberOfYearsString = JOptionPane.showInputDialog("Enter number of years: ");
double numberOfYears = Double.parseDouble(numberOfYearsString);

double futureInvestmentValue = investmentAmount * Math.pow((1 + annuallyInterestRate), numberOfYears * 12);

String ouput = "Accumulated value is " + futureInvestmentValue;
JOptionPane.showMessageDialog(null, ouput);
}

}