Reversing a String in Java

The following code shows different methods of reversing a String in Java. The simplest being using the reverse() method of StringBuffer, while the other methods use char array and recursion:

public class StringReverse {<br />	public static void main(String[] args) {<br />		String s = "zyxwvutsrqponmlkjihgfedcba";<br />		System.out.println(charReverse(s));<br />		System.out.println(recursiveReverse(s , new StringBuffer()));<br />		System.out.println(recursiveReverse2(s, new StringBuffer()));<br />		System.out.println(bufferReverse(s));<br />	}<br />	<br />	public static String charReverse(String s) {<br />		char[] cArr = s.toCharArray();<br />		StringBuffer reversed = new StringBuffer();<br />		for(int i=cArr.length-1; i>=0; i--) reversed.append(cArr[i]);<br />		return reversed.toString();<br />	}<br />	<br />	public static String recursiveReverse(String s, StringBuffer t) {<br />		if(s.length() > 0) {<br />			t.append(s.substring(s.length()-1));<br />			recursiveReverse(s.substring(0, s.length()-1), t);<br />		}<br />		return t.toString();<br />	}<br />	<br />	public static String recursiveReverse2(String s, StringBuffer sb) {<br />		if (s.length() == 1){<br />			sb.append(s);<br />		}<br />		else{<br />			recursiveReverse2(s.substring(1, s.length()), sb);  <br />			sb.append(s.substring(0,1));<br />		}<br />		return sb.toString();<br />	}<br />	<br />	public static String bufferReverse(String s) {<br />		StringBuffer sb = new StringBuffer(s);<br />		return sb.reverse().toString();<br />	}<br />}