java - 试图在java中四舍五入到两位小数

Question

System.printf("%.2f", currentBalance) 工作正常，但问题是四舍五入的数字出现在句子之后。将代码放入你的 eclipse 程序并运行它，你可以看到肯定有问题。如果有人可以提供帮助，将不胜感激。

public class BankCompound {


public static void main (String[] args) {
    compound (0.5, 1500, 1);
}

public static double compound (double interestRate, double currentBalance, int year) {

    for (; year <= 9 ; year ++) {

    System.out.println ("At year " + year +  ", your total amount of money is ");
    System.out.printf("%.2f", currentBalance);
    currentBalance = currentBalance + (currentBalance * interestRate);  
    }
    System.out.println ("Your final balance after 10 years is " + currentBalance);
    return currentBalance;
} 

}

Answer 1

请试试这个

import java.text.DecimalFormat;



public class Visitor {


    public static void main (String[] args) {
        compound (0.5, 1500, 1);
    }

    public static double compound (double interestRate, double currentBalance, int year) {

        for (; year <= 9 ; year ++) {

        System.out.println ("At year " + year +  ", your total amount of money is "+Double.parseDouble(new DecimalFormat("#.##").format(currentBalance)));


        currentBalance = currentBalance + (currentBalance * interestRate);  
        }
        System.out.println ("Your final balance after 10 years is " + currentBalance);
        return currentBalance;
    } 
}