一个变麻烦了的解法

import java.util.*;

public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        String in = sc.nextLine();
        int i = in.length()-1;
        boolean flag = false;

        for(int j = 0; j <= i;j++){
            if(in.charAt(j) == ' ') {
                flag = true;
                break;
            }
        }

        if(flag){
            while(in.charAt(i) != ' '){
                if(i == 0) break;
                i--;
            }
            System.out.println(in.length() - i -1);
        }else{
            System.out.println(in.length());
        }
    }
}