Java Reverse String Code Example

package gigasblade;

// If you have any comments please let me know!
public class ReverseString {
    private static String reverse(String s) {
        if (s == null) {
            return s;
        }
        final char[] reversed = new char[s.length()];
        for (int i = 0; i < s.length() ; i++) {
            reversed[s.length() - 1 - i] = s.charAt(i);
        }
        return String.valueOf(reversed);
    }

    private static void checkReverse(String s) {
        System.out.println("reverse(" + stringRepresentation(s) + "): " + stringRepresentation(reverse(s)));
    }

    private static String stringRepresentation(String s) {
        return (s != null) ? '"' + s + '"' : "null";
    }

    public static void main(String[] args) {
        checkReverse(null);
        checkReverse("");
        checkReverse("A");
        checkReverse("123");
        checkReverse("abcd");
        checkReverse("Ala");
        checkReverse("ellE");
        checkReverse("neuquen");
        checkReverse("A0");
        checkReverse("9<");
    }
}