Convert 1 to 01

Question

I have an int between 1 - 99. How do I get it to always be a double digit, ie: 01, 04, 21?

Answer 1

Yet another way

String text = (num < 10 ? "0" : "") + num;

EDIT: The code is short enough that the JIT can compile it to nothing. ;)

long start = System.nanoTime();
for(int i=0;i<100000;i++) {
    for(int num=1;num<100;num++) {
        String text = (num < 10 ? "0" : "") + num;
    }
}
long time = System.nanoTime() - start;
System.out.println(time/99/100000);

prints

0