写一个函数，将"tom is cat"倒序打印出来，即"cat is tom"

参考解答

public static String reverse(String str) {
    String[] split = str.split(" ");
    StringBuilder sb = new StringBuilder(str.length());
    for (int i = split.length - 1; i >= 0; i--) {
        sb.append(split[i]);
        if (i > 0) {
            sb.append(" ");
        }
    }
    return sb.toString();
}