如何将小数点更改为冒号？

Question

Without changing the code, how would I be able to change the output from being 13.00 to 13:00? Is it possible to do so in the printf string?

  System.out.print("Please enter the current hour on the clock(no minutes): ");
  double time = sc.nextDouble();

  System.out.print("Please enter the duration in hours: ");
  int duration = sc.nextInt();

  double newTime = (time+duration)-24;
  System.out.println();

  System.out.printf("If it is %.2f, in %d hours, it will be %.2f.\n",time,duration,newTime);

Answer 1

我建议替换“.”到“：”作为 stand-alone 行。我不明白你为什么要在 printf 中这样做。尽管如此，这里有一个如何做到这一点的例子

System.out.printf("If it is %s.\n", String.valueOf(time).replace(".",":"));

本质上是将双精度数转换为字符串，然后替换字符。另外，记得更改 %s 标签。

如何将小数点更改为冒号？

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