LengthOfLastWord,字符串最后一个子串的长度

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

.

public class LengthOfLastWord
{
public int lengthOfLastWord(String s)
{
if(s!=null && !s.trim().equals(""))//equals比较的是内容，==比较的是地址
{
//去掉开始和结尾的空格
String[] arr = s.trim().split(" ");
int len = arr[arr.length - 1].length();
return len;
}
return 0;
}
}