public class PermuteExample {
	public static void main(String[] args) {
		permute("marty");
	}

	// Outputs all permutations of the given string.
	public static void permute(String s) {
	    permute(s, "");
	}
	
	private static void permute(String s, String chosen) {
	    if (s.length() == 0) {
	        // base case: no choices left to be made
	        System.out.println(chosen);
	    } else {
	        // recursive case: choose each possible next letter
	        for (int i = 0; i < s.length(); i++) {
	            char ch = s.charAt(i);              // choose
	
	            String rest = s.substring(0, i) +   // remove
	                          s.substring(i + 1);
	
	            permute(rest, chosen + ch);         // explore
	        }
	    }       // (don't need to "un-choose" because
	}           //  we used temp variables)


	private static void permute1(String s, String chosen) {
	    if (s.length() == 0) {
	        // base case: no choices left to be made
	        System.out.println(chosen);
	    } else {
	        // recursive case: choose each possible next letter
	        for (int i = 0; i < s.length(); i++) {
	            char c = s.charAt(i);   // choose
	            s = s.substring(0, i) + s.substring(i + 1);
	            chosen += c;
	
	            permute(s, chosen);     // explore
	
	            s = s.substring(0, i) + c + s.substring(i);
	            chosen = chosen.substring(0, chosen.length() - 1);
	        }                           // un-choose
	    }
	}
}