Java 如何使其显示2个小数点？

我需要这一行是2个小数点

System.out.println(i + "\t\t" + interest + "\t\t" + principal + "\t\t" + balance);

我的全部代码是

import java.util.Scanner;
public class assignment5dot22 {

    public static void main(String[] args) {

        int numberOfYears;
        double loanAmount;
        double annualInterest;
        double monthlyInterest;
        double monthlyPayment;
        double principal; 
        double balance;
        double interest;

        Scanner input = new Scanner(System.in);

        System.out.print("Loan Amount: ");
        loanAmount = input.nextDouble();
        System.out.print("Number of Years: ");
        numberOfYears = input.nextInt();
        System.out.print("Annual Interest Rate: ");
        annualInterest = input.nextDouble();

        monthlyInterest = annualInterest / 1200;

        monthlyPayment = loanAmount*monthlyInterest / (1 - (Math.pow(1 / (1 + monthlyInterest),
                numberOfYears * 12)));
        balance = loanAmount;

        System.out.println("Monthly Payment: "
                + (monthlyPayment * 100) / 100.0);
        System.out.println("Total Payment: "
                + (monthlyPayment * 12 * numberOfYears * 100) / 100.0);

        System.out.println("\nPayment#\tInterest\tPrincipal\tBalance");

        for (int i = 1; i <= numberOfYears * 12; i++) {
            interest = (monthlyInterest * balance);
            principal = ((monthlyPayment - interest)*100) / 100.0;
            balance = ((balance - principal) * 100) / 100.0;

            System.out.println(i + "\t\t" + interest + "\t\t" + principal + "\t\t" + balance);
        }
    }


}

---

我建议尝试对输出使用String.format

e、 g

---

String.format允许您使用%d和%.2f分别明确说明数据整数和浮点的格式

在这些情况下，您可以使用String.format或直接使用System.out.printf，如下所示：

对于这些情况，它更具可读性和简洁性。

您也可以使用类似于printf的System.out.printf%d\t\t%.2f\t\t%.2f\t\t%.2f%n，i，利息，本金，余额；

System.out.println(String.format("%d \t\t %.2f \t\t %.2f \t\t %.2f", i, interest, principal, balance);

System.out.printf("%d \t\t %.2f \t\t %.2f \t\t %.2f\n", i, interest, principal, balance);