Question

import java.util.Scanner;
import java.text.DecimalFormat;
public class Assignemt7_2
{
  public static void main (String [] args)
  {
    //Create a Scanner
    Scanner input = new Scanner (System.in);
    //Prompt the user to enter the amout of loan borrowed
    System.out.print ("Enter the amout of loan borrowed: $");
    double L = input.nextDouble();
    //Prompt the user to enter the number of the months of the loan
    System.out.print ("Enter the number of the months of the loan: ");
    double n = input.nextDouble();
    //Prompt the user to enter the annual interest rate
    System.out.print ("Enter the annual interest rate: ");
    double i = input.nextDouble();
    System.out.println ("The monthly loan payment is " + monthlyPaymentCalculation (L,n,i));
  }
  public static double monthlyPaymentCalculation (double L, double n, double i)
  {
    double r = i / 12;
    double P = ( r * L ) / ( 1 - Math.pow ((1+r),(-n)));
    DecimalFormat df = new DecimalFormat ("#####.##");
    return df.format (P); // returns value of P with two decimal place
  }
}

应返回带有两个十进制值的P值，但它会不断出现required: double found: java.lang.String错误

Answer 1

format返回String而不是double。将monthlyPaymentCalculation的返回类型更改为String

如何解决“必填：双找到：java.lang.String”错误？

1 个答案: