题解 | #句子逆序#

import java.util.Scanner;
import java.util.Stack;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String s = sc.nextLine();
        String[] strings = s.split(" ");
        Stack<String> resultStack = new Stack<>();
        for (String string : strings) {
            resultStack.push(string);
        }
        if (resultStack.size() == 1) {
            System.out.print(resultStack.pop());
        } else {
            while (resultStack.size() > 0) {
                System.out.print(resultStack.pop());
                System.out.print(" ");
            }
        }
    }
}