java输入贷款年利率，贷款金额，贷款年数 * 输出月还款以及共还款金额

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package Second;import javax.swing.JOptionPane;/* * 输入贷款年利率，贷款金额，贷款年数 * 输出月还款以及共还款金额 */public class Demo2 {    public static void main(String[] args) {        // TODO Auto-generated method stub        //Enter yearly interest rate                String annualInterestRateString = JOptionPane.showInputDialog(                        "Enter yearly interest rate,for example 8.25: ");                                //Covert string to double                double annualInterestRate =                    Double.parseDouble(annualInterestRateString);                                //Obtain monthly interest rate                double monthlyInterestRate = annualInterestRate / 1200;                                //Enter number of years                String numberOfYearString = JOptionPane.showInputDialog(                        "Enter numbers of years as an integer, \nfor example 5: ");                                //Convert string to int                int numberOfYears = Integer.parseInt(numberOfYearString);                                //Enter loan amount                String loanString = JOptionPane.showInputDialog(                        "Enter loan amount,for example 120000.95:");                                //Convert String to double                double loanAmount = Double.parseDouble(loanString);                                //Calclate payment                 double monthlyPayment = loanAmount * monthlyInterestRate / (1                        - 1/ Math.pow(1 + monthlyInterestRate, numberOfYears * 12));                double totalPayment = monthlyPayment * numberOfYears *12;                                //Format to keep two digits after the decimal point                monthlyPayment = (int)(monthlyPayment * 100) / 100.0;                totalPayment =(int)(totalPayment * 100) / 100.0;                                //Display results                String output = "The monthly payment is " + monthlyPayment +                "\nThe total payment is " + totalPayment;                JOptionPane.showMessageDialog(null,output);                                }    }
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