Reverse string without buffer

StringReverce.java

public class StringReverce{
	/**
	* Reverse string without buffer
	*/
	public static byte[] reverse(byte[] str){
		int end = str.length - 1;
		for( int i = 0; i < end - i; ++i ){
			str[i] = (byte)( str[i] ^ str[end-i] );
			str[end-i] =  (byte)( str[end-i] ^ str[i] );
			str[i] = (byte)(str[i] ^ str[end-i]);
		}
		return str;
	}
	private static void println(String pred, byte[] data){
		System.out.print(pred);
		for( byte b : data ){
			System.out.print((char)b);			
		}
		System.out.print('\n');
	}	
	public static void main(String[] args){		
		byte str[] = (args.length > 0 ? args[0] : "Simple string").getBytes();
		println("Input:", str);
		str = reverse(str);
		println("Output:", str);	
	}
}