58. Length of Last Word

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.

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Solution:

Tips:

reverse count the word length.

Java Code:

public class Solution {    public int lengthOfLastWord(String s) {        if (null == s || s.trim().isEmpty()) {            return 0;        }                s = s.trim();        int wordLength = 0;        for (int i = s.length() - 1; i >= 0; i--) {            if (s.charAt(i) == ' ') {                return wordLength;            } else {                wordLength++;            }        }                return wordLength;    }}