Length of Last Word

58. Length of Last Word

Difficulty: Easy

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

Solution

不用split,遍历一下就行了，找到最后一个空格的下标，用字符长度相减

Language: Java

class Solution {
    public int lengthOfLastWord(String s) {
        s = s.trim();
        if(s.length()==0)return 0;
        int j;
        for(j=s.length()-1;j>0;j--){
            if(s.charAt(j)==' '){
                j++;
                break;
            }
        }
        return s.length()-j;
    }
}