[Java] Reverse a String

Java Reverse a String.java

    /**
     * Reverses a string using StringBuilder.
     * You can replace it with a StringBuffer as well,
     * but in this case, you don't need it to be thread-safe, 
     * hence, a StringBuilder will do.
     * @param input
     * @return
     */
    static String reverseString(String input) {
    	return (new StringBuilder(input)).reverse().toString();
    }
    
    
    /**
     * Reverses a given String by transforming the 
     * input to a character array and then comparing
     * its indices to check if it is the same.
     * @param input
     * @return
     */
    static String reverseStringV2(String input) {
    		char[] charArray = input.toCharArray();
    		int endIndex = charArray.length - 1;
    		
        // We only need to iterate upto the middle of 
        // the array, to check each end.
    		for (int i=0; i <= (endIndex / 2); i++) {
    			char temp = charArray[i];
    			charArray[i] = charArray[endIndex - i];
    			charArray[endIndex - i] = temp;
    		}
 
    		return new String(charArray);	
    }