题解 | #字符串最后一个单词的长度#

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String str = scanner.nextLine();
        if (str != "" && str != null) {
            if (str.contains(" ")) {
            StringBuffer strBf = new StringBuffer(str);
            strBf = strBf.reverse();
            int index = strBf.indexOf(" ");
            System.out.println(index);
            } else {
                System.out.println(str.length());
            }
        }
    }
}