30.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.

分析：首先将字符串以单个或多个空格分开，找到数组的末尾元素，计算其长度即可。

public int lengthOfLastWord(String s) {        String[] sArray = s.split("[' ']+");        System.out.println("sArray.length = "+sArray.length);        if(sArray.length == 0){        return 0;        }        String re = sArray[sArray.length-1];        return re.length();    }