Length of Last Word

问题：

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

.

解决：

① 将字符串转换为字符串数组，然后计算。

public class Solution {//7ms
public int lengthOfLastWord(String s) {
String[] schar = s.trim().split(" ");
if(schar.length == 0) return 0;
return schar[schar.length - 1].length();
}
}

② 直接在字符串末尾开始计算，停在‘ ’的位置。

public class Solution {//5ms
public int lengthOfLastWord(String s) {
int len = 0;
for(int i = s.length() - 1; i >= 0; i --){
if(s.charAt(i) != ' ')
len ++;
else if(len != 0)
break;
}
return len;
}
}