Weekly Puzzle#1: Guess, what this code does?

No copy-past and compilation, please! Try to understand, what this Java code does just reading it. Be honest with yourself, cheaters die along :)

// Java program to print ***
public class Secret
{
public static void main(String[] args)
{
String str = "ABC";
int n = str.length();
Secret secret = new Secret();
secret.doYourDance(str, 0, n-1);
}

/**
* *** function
* @param str string to ***
* @param l starting index
* @param r end index
*/
private void doYourDance(String str, int l, int r)
{
if (l == r)
System.out.println(str);
else
{
for (int i = l; i {
str = swap(str,l,i);
doYourDance(str, l+1, r);
str = swap(str,l,i);
}
}
}

/**
* Swap Characters at position
* @param a string value
* @param i position 1
* @param j position 2
* @return swapped string
*/
public String swap(String a, int i, int j)
{
char temp;
char[] charArray = a.toCharArray();
temp = charArray[i] ;
charArray[i] = charArray[j];
charArray[j] = temp;
return String.valueOf(charArray);
}

}

Got it? was is hard, smart a**s? :) Stay tuned for more puzzles!

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