【字符串】实现字符串的翻转

import java.util.Scanner;

/**
 * 功能：字符串翻转，例如how are you 翻转为you are how
 */
public class Main5 {

    public String swap(String string) {

        if (string == null) {
            return null;
        }

        String[] strings = string.split(" ");

        String temp;
        for (int i = 0; i < strings.length / 2; i++) {
            temp = strings[i];
            strings[i] = strings[strings.length - 1 - i];
            strings[strings.length - 1 - i] = temp;
        }

        StringBuilder stringBuilder = new StringBuilder();
        for (int i = 0; i < strings.length; i++) {
            if (i != 0) {
                stringBuilder.append(" ");
            }
            stringBuilder.append(strings[i]);
        }

        return stringBuilder.toString();
    }

    public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);
        Main5 main5 = new Main5();

        while (scanner.hasNextLine()) {
            String string = scanner.nextLine();
            System.out.println(main5.swap(string));
        }
    }
}