ReverseString

public class ReverseStringTest {
public static void main(String[] args) {
String str = "What's going on?";
System.out.println(ReverseString.reverseIt(str));
}
}

class ReverseString {
public static String reverseIt(String source) {
int i, len = source.length();
StringBuffer dest = new StringBuffer(len);

for (i = (len - 1); i >= 0; i--)
dest.append(source.charAt(i));
return dest.toString();
}