题解 | #句子逆序#

import java.util.Scanner;
import java.util.Deque;
import java.util.ArrayDeque;

// 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 in = new Scanner(System.in);
        Deque<String> stack = new ArrayDeque<>();
        while (in.hasNext()) {
            stack.push(in.next());
        }
        boolean isFirst = true;
        while (!stack.isEmpty()) {
            if (!isFirst) {
                System.out.print(" ");
            }
            isFirst = false;
            System.out.print(stack.poll());
        }
        System.out.println();
    }
}