58.Length of Last Word (最后一个单词长度)

描述：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.

代码

public class Solution {
    public int lengthOfLastWord(String str1) {
           String s = str1.replaceAll(" +"," ");
       if(" ".equals(s)||s==null)
           return 0 ;
           else{
           String []str = s.split(" ");
    return str[str.length-1].length();
           }
    }
}