题解 | #字符串最后一个单词的长度#

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

public class Main {
    public static void main(String[] args) {
        Scanner sc=new Scanner(System.in);
        while (sc.hasNext()){
            String word= sc.nextLine();
            char[] c=word.toCharArray();
            int count=0;
            for (int i=c.length-1;i>=0;i--){
                if (c[i]==' '){
                    break;
                }
                count++;
            }
            System.out.print(count);

        }
    }
}

第二种（跟第一个差不多）

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc=new Scanner(System.in);
        while (sc.hasNext()){
            String word= sc.nextLine();
            char[] c=word.toCharArray();
            int count=0;
            for (int i=c.length-1;i>=0;i--){
                if (Character.isSpaceChar(c[i])){
                    break;
                }
                count++;
            }
            System.out.print(count);
            
        }
    }
}