计算某字符串中某最后单词的长度 java

package com.patience.interview.huawei;
import java.util.Scanner;

public class LastString {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String str = sc.nextLine();
        int len = (str.substring(str.lastIndexOf(" ") + 1)).length();
        System.out.println(len);
    }
}