leetcode58:Length of last word

package com.leetcode;

public class Solution58 {
public static int lastWordLength(String str){
if( str.lastIndexOf(' ') != -1)
return str.trim().length()-str.trim().lastIndexOf(' ')-1;
else
return str.length();
}
public static void main(String[] args) {
// TODO Auto-generated method stub
String str="a ";
System.out.println(Solution58.lastWordLength(str));
}

}