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) {
// TODO Auto-generated method stub
Scanner sc =  new Scanner(System.in);
String str = sc.nextLine();
lastWordLength(str);
}

private static void lastWordLength(String str) {
// TODO Auto-generated method stub
if(str == null)
return;
String [] tmp = str.split(" ");
System.out.println(tmp[tmp.length-1].length());
}

}