Please help finding pre-exsisting methods

Question

please help find pre-existing methods
JavaFirstTime Jan 2, 2005 3:21 PM
please help clever people :)
how to output decimals in 2 decimal places only?
how to output large integers using format: 12,376,452
I've been told there are pre-existing methods for that, but i just can't find it... ideally i need to know the source code...

Answer 1

Well, there's many ways to do it ... Here's one:
class NumberFormatDemo {
public static void main(String[] args) {
new NumberFormatDemo().go();
public void go() {
double decimal = 123.456;
System.out.println((int) decimal + "." + (int)
+ (int) (decimal * 100 + 0.5) % 100);
int largeInteger = 12376452;
System.out.println(recursive(largeInteger));
public String recursive(int largeInteger) {
if (largeInteger > 999) {
return recursive(largeInteger/1000) + ","
1000) + "," + largeInteger%1000;
} else {
return "" + largeInteger;
yes, that's exactly wot i need...
how didn't i think of that myself, using mathematics, i was thinking it would be more complicated like converting decimals to string then count letters and so on.
Thank you for putting me on the right track :)