java - 打印形成

Question

我很早就提出了一个问题并得到了一些很大的帮助:D My first question 。我以为我已经脱离困境了，但我想并没有。我正在设置/形成我的程序获取的信息，但在尝试打印我的变量“时间”时遇到了问题，如果有人能指出我做错了什么，我将非常感激。

我认为有问题的代码部分是:

// this class prints a loan statement showing the amount borrowed
    // and the amount borrowed, the annual interest rate, the number of months
    // and the monthly payment
    public static void loanStatement(double principle, double interest, int time, double mPayment)
    {
       System.out.printf("%2s%13s%8s%20s%n", "Principle", "Interest", "Time", "Monthly Payment");
       System.out.printf("%2.2f%10.2f%10.2f%n", +principle, +interest +time);
       System.out.println("monthly payment is" +mPayment);
       System.out.println("interest is" +interest);
       System.out.println("Time is" +time);

当我取出 +time 并删除 10.2f (我尝试了许多不同的组合)时，我没有收到任何错误。我还打印了时间和每月付款变量，并得到了奇怪的数字网格。

我放入了其他 println，因为我想检查程序是否返回了正确的值，事实确实如此。

下面是我遇到的格式错误

Principle     Interest    Time     Monthly Payment
Exception in thread "main" java.util.MissingFormatArgumentException: Format specifier '10.2f'
15000.00     36.07  at java.util.Formatter.format(Formatter.java:2487)
    at java.io.PrintStream.format(PrintStream.java:970)
    at java.io.PrintStream.printf(PrintStream.java:871)
    at loanpayment.LoanPayment.loanStatement(LoanPayment.java:89)
    at loanpayment.LoanPayment.main(LoanPayment.java:55)
Java Result: 1
BUILD SUCCESSFUL (total time: 6 seconds)

我希望我的问题对你们来说有意义，并提前感谢您的帮助!

Answer 1

您在此处仅提供两个输入:

   System.out.printf("%2.2f%10.2f%10.2f%n", +principle, +interest +time);

而它需要三个。也许您缺少在 +time 之前添加逗号(,) 如果符合您的逻辑，请尝试以下操作:

   System.out.printf("%2.2f%10.2f%10.2f%n", +principle, +interest, +time);