leetcode8/LengthOfLastWord.java at master · 1code/leetcode8 · GitHub

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public class Solution {
    public int lengthOfLastWord(String s) {
        // Start typing your Java solution below
        // DO NOT write main() function
        s = s.trim();
        int start = s.length();
        for(int i = s.length() - 1; i >= 0; --i){
            if(s.charAt(i) == ' '){
                start = i + 1;
                break;
            }
            if(i == 0)
		start = 0;
        }
        return s.length() - start;
    }
}

public class Solution {
    public int lengthOfLastWord(String s) {
        // Start typing your Java solution below
        // DO NOT write main() function
        int end = s.length() - 1;
        while(end >= 0 && s.charAt(end) == ' ')
            --end;
        if(end < 0)
            return 0;
        int start = end;
        while(start >= 0 && s.charAt(start) != ' ')
            --start;
        return end - start;
    }
}