如何在print语句中使用零填充标志正确打印​​两个位置

Question

如果想使用零垫打印此方法，您如何这样做

int month, day;

public void  printNumeric()
{
  System.out.printf("month +"/" +day +" \n");
  // i would like the month if it is 5 to be 05 same thing with the day
}

Answer 1

int month, day;

public void  printNumeric()
{
  System.out.printf("%02d/%02d\n", month, day);
  // i would like the month if it is 5 to be 05 same thing with the day
}

Answer 2

您可以使用java.util.Formatter或String.format

String.format("%02d", somenumber)

Answer 3

for (int i=0; i<19; i++)
   System.out.format("i: %02d\n", i);