题解 | #句子逆序#

import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String str = sc.nextLine()+" ";
        char[] chars = str.toCharArray();
        //以空格为界限，把数字内容放入map中，再倒序输出
        Map<Integer,String> map = new HashMap<>();
        String s ="";
        //System.out.println(s.length());
        int count =0;
        //System.out.println(s+"111");
        for (int i = 0; i < chars.length ; i++) {
            if (chars[i]==' '){
                count++;
                map.put(count,s);
                //System.out.println(map.values());
                //System.out.println(map.keySet());
                //System.out.println(count);
                //System.out.println(s);
                s="";
            }
            else{ s=s+chars[i];}
        }
        for (int i = 0 ; i<count ; i++){
            System.out.print(map.get(count-i)+" ");
        }
    }
}