注意这种第一个不符合要求的元素的求法的写法
class Solution {
public int lengthOfLastWord(String s) {
if(s==null||s.length()==0) return 0;
int pos = s.length()-1;
int result = 0;
while(pos>=0&&s.charAt(pos)==' ')
pos--;
// last not null character
if(pos==-1)
return 0;
// do not have any content
int end =pos;
while(pos>=0&&s.charAt(pos)!=' ')
pos--;
int start=pos;
return end-start;
}
}
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