058. Length of Last Word

public class Solution {
    public int lengthOfLastWord(String s) {
        int count=0;
        if(s==null||s.length()==0)
        return count;
        int i=s.length()-1;
         while(i>=0&&s.charAt(i)==' '){ //you need this to delete all the space from the end
	        	i--;
	        }
        while(i>=0&&(s.charAt(i)!=' ')){
            i--;
            count ++;
        }
        return count;
    }
}