lengthOfLastWord.java

/**
##Easy
Given a string s consisting of some words separated by some number of spaces, return the length of the last word in the string.

A word is a maximal substring consisting of non-space characters only.
Example 1:

Input: s = "Hello World"
Output: 5
Explanation: The last word is "World" with length 5.

Example 2:

Input: s = "   fly me   to   the moon  "
Output: 4
Explanation: The last word is "moon" with length 4.

Example 3:

Input: s = "luffy is still joyboy"
Output: 6
Explanation: The last word is "joyboy" with length 6.


**/

class Solution 
{
    public int lengthOfLastWord(String s) 
    {
        //Alternate Algorithm
//         String[] words = s.split("\\W+");
        
//         String lastWord = words[words.length - 1];
        
//         return lastWord.length();
        
        int lengthOfString, lastWordLength = 0;
        
        s = s.strip();
        lengthOfString = s.length(); //get length of string s
        
        //loop and count from the last index in string till you count all characters in the last word in string.
         for(int i=lengthOfString-1; i>=0;  i--)
         {
             if(s.charAt(i) !=' ')
                 lastWordLength = lastWordLength + 1;
             else
                 break;
         }

         return lastWordLength;
    }

}