通过分割取出最后一个字符

import java.util.Scanner;

public class Main{
    public static void main(String[] args){
        Scanner  in = new Scanner(System.in);
        while(in.hasNext()){
            int rst = maxLengthStr(in.nextLine());
            System.out.println(rst);
        }

    }
    public static int maxLengthStr(String source){
        if ("".equals(source) || source.length()==0){
            return 0;
        }else{
           String[] wordArray= source.split(" ");
           return wordArray[wordArray.length-1].length();
        }
    }
}