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

小鱼儿 2022-07-11 13:41 259阅读 0赞

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);
                        
                }
    
        }