gistfile1.java

public class Reverser {
	public static void main(String[] args) {
		String input = "1 2 3";
		String output = "";
		System.out.println("Input :: "+input);
		
		while (input.length() > 0) {
			String element = input.substring(input.length() - 1, input.length());
			output += element;
			input = input.substring(0, input.length() - 1);
		}
		
		System.out.println("Output :: "+output);
	}
}