Getting 01 output versus 1

[Mark Adams]

Can anyone please tell me how I can get a double digit output of 01 rather than just 1.

I have an output that looks like this: 1,22,2,45,6
and would like it to look like this: 01,22,02,45,06

I know it someting very silly and can't wait to see the response.

Thank you,

Mark

[Jesper de Jong]

There are several ways to do this.

int value = 7;
 
// Use String.format()
String text = String.format("%02d", value);
 
// Use DecimalFormat
DecimalFormat fmt = new DecimalFormat("00");
String text = fmt.format(value);
 
// Or, in this simple case, you can just do:
String text;
if (value < 10) {
  text = "0" + value;
}
else {
  text = "" + value;
}
 
// Or, even shorter:
String text = value < 10 ? ("0" + i) : ("" + i);

[Campbell Ritchie]

. . . and what about

System.out.printf("%02d", number);

Even shorter!