Leetcode Length of Last Word (java)

Given a string s consists of upper/lower-case alphabets and empty space characters

'
 '

, return the length of last word in the string.

If the last word does not exist, return 0.

Note: A word is defined as a character sequence consists of non-space characters only.

For example,

Given s =

"Hello World"

,

return

5

.

solution 1:

public class Solution {
    public int lengthOfLastWord(String s) {
        if(s == null || s.length() ==0)
	    	 return 0;
	     int result = 0;
	     int length = s.length();
	     boolean flag = false;
	     for(int i=length-1; i>=0; i--)
	     {
	    	 char c = s.charAt(i);
	    	 if((c>='A' && c<='Z') ||( c>='a' && c<='z'))
	    	 {
	    		 flag = true;
	    		 result++;
	    	 }else
	    	 {
	    		 if(flag)
	    		 {
	    			 return result;
	    		 }
	    	 }
	     }
	     return result;  
    }
}

soulution 2:

public class Solution {
    public int lengthOfLastWord(String s) {
       if(s == null || s.length() ==0 || s.trim().equals(""))
	    	 return 0;
	    String[] strs = s.split(" ");
	    
	    String str = strs[strs.length-1];
	 
	    return str.length();
    }
}