题解 | #倒置字符串#

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        String str = in.nextLine();
        String[] strArr =  str.split(" ");
        int left = 0, ritht = strArr.length-1;
        while(left < ritht){
            String swap = strArr[left];
            strArr[left] = strArr[ritht];
            strArr[ritht] = swap;
            left++;
            ritht--;
        }
        StringBuilder sb = new StringBuilder();
        for(int i =0;i<strArr.length;i++){
            sb.append(strArr[i]);
            if(i != strArr.length -1){
                sb.append(' ');
            }
        }
        System.out.println(new String(sb));
    }
}