58. Length of Last Word (Easy)

https://leetcode.com/problems/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.

Example:

Input: "Hello World"
Output: 5

Solutions

class Solution {

    public int lengthOfLastWord(String s) {
        if (s == null || s.length() == 0) {
            return 0;
        }

        if (!s.contains(" ")) {
            return s.length();
        }

        String[] substr = s.split(" ");
        for (int i = substr.length - 1; i >= 0; i--) {
            if (substr[i] != null || substr[i].length() != 0) {
                return substr[i].length();
            }
        }

        return 0;
    }
}

Incorrect Solutions

References

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