I doubt it. The problem is that 100 is never 100 if it’s a float, it’s normally 99.9999999999 or 100.0000001 or something like that.
If you do want to format it that way, you have to define an epsilon, that is, a maximum distance from an integer number, and use integer formatting if the difference is smaller, and a float otherwise.
Something like this would do the trick:
public String formatDecimal(float number) {
float epsilon = 0.004f; // 4 tenths of a cent
if (Math.abs(Math.round(number) - number) < epsilon) {
return String.format("%10.0f", number); // sdb
} else {
return String.format("%10.2f", number); // dj_segfault
}
}