题解 | #字符串最后一个单词的长度#

import java.util.Scanner;

// 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);
        String s = in.nextLine();
        int length = lengthOfLastWord(s);
        System.out.print(length);
    }

    private static int lengthOfLastWord(String s) {
        s = s.trim();
        int lastSpaceIndex = s.lastIndexOf(' ');
        return s.length() - lastSpaceIndex - 1;
    }
}