Java:如何在一定次数的迭代后暂停输出直到按下一个键

Question

我正在为我的一门大学类(class)学习 Java，我需要知道如何在 for 循环的每 12 次迭代后暂停我的程序的输出。我有一个迭代 360 次的循环，我希望每 12 个项目循环输出输出停止，直到按下一个键。我进行了相当多的搜索，但我发现的所有内容都在更高级的上下文中，我不太了解代码中还发生了什么。该程序没有 GUI，它非常简单，我可以将所有代码粘贴到这里:

public class MyMain

{      
    static double principal = 200000.00;
    static double interest = .0575;
    static int term = 360;
    static DecimalFormat currency = new DecimalFormat("###,###.##");

    public static void main(String[] args)
    {

        MortgageCalculator mortgageWeek2 = new MortgageCalculator(principal, interest, term);
        double monthlyPayment = mortgageWeek2.calculate();
        System.out.println("Welcome to my Mortgage Calculator.");
        System.out.println("The principal on this loan is $" + currency.format(principal) + ".");
        System.out.println("The interest on this loan is " + (interest * 100) + "%.");
        System.out.println("The term on this loan is " + term + " months (" + term / 12 + " years).");
        System.out.println("Payments on this loan will be $" + currency.format(monthlyPayment));

        double balanceRemaining = 200000.0;



        for (int i = 0; i < 30 * 12; i++)
        {
            double interestPaid = balanceRemaining * .0575 / 12;
            double principalPaid = monthlyPayment - interestPaid;
            balanceRemaining = balanceRemaining - principalPaid;
            System.out.println("Month " + (i + 1) + " \tPayment Amount: $" + currency.format(monthlyPayment) + 
                    "\tInterest Paid: $" + currency.format(interestPaid) + 
                    " \tPrincipal Paid: $" + currency.format(principalPaid) + 
                    "    \tBalance Remaining: $" + currency.format(balanceRemaining));
        }
      }
    }

Answer 1

将 for 循环分成两段，并在外层循环中添加一个 input 语句，如下所示:

    Scanner input = new Scanner(System.in);
    String userInput = null;
    for (int i = 0; i < 30; i++)
    {
      for (int j = 0; j < 12; j++)
      {
        double interestPaid = balanceRemaining * .0575 / 12;
        double principalPaid = monthlyPayment - interestPaid;
        balanceRemaining = balanceRemaining - principalPaid;
        System.out.println("Month " + (i*12+j + 1) + 
                 " \tPayment Amount: $" + currency.format(monthlyPayment) + 
                "\tInterest Paid: $" + currency.format(interestPaid) + 
                " \tPrincipal Paid: $" + currency.format(principalPaid) + 
                "    \tBalance Remaining: $" + currency.format(balanceRemaining));
      }
      userInput = input.nextLine();
    }
    input.close();

停止后，您需要按任意字符和返回键或只按返回键。