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
.
思路:先trim掉,然后从后往前数,遇见空格就返回count。
public class Solution {
public int lengthOfLastWord(String s) {
if(s == null || s.length() ==0) return 0;
s = s.trim();
int count = 0;
for(int i=s.length()-1; i>=0; i--){
if(s.charAt(i)!=' '){
count++;
} else {
break;
}
}
return count;
}
}