string manipulation in java part 1: reverse a string

In these series, I'll try to provide code fragments for daily problems in string manipulation. First, we will see how to reverse a string. Note that there are -naturally- more than one way to do this.

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01	public class StringUtils {

02	public static String reverseString(String string){

03

/*

04	Check if the string is not null and empty

05

*/

06

07	if(string != null && !string.isEmpty()){

08

09

/*

10	Create a StringBuilder from the string in hand

11

*/

12

13	StringBuilder str = new StringBuilder(string);

14

15

/*

16	Reverse the StringBuilder content and return it as a String

17

*/

18

19	return str.reverse().toString();

20

}

21	return null;

22

}

23

24	public static void main(String[] args){

25	System.out.println(StringUtils.reverseString("I am your father"));

26

}

27

}

Output is "rehtaf ruoy ma I".
It is possible to use StringBuffer instead of StringBuilder. As I don't need thread safety I'll pick StringBuilder which's faster. Quite easy to reverse a string, right?

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