58. Length of Last Word

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.

问题：返回最后一个单词的长度，注意情况“abc hello   ”末尾有空格情况

public int lengthOfLastWord(String s) { if(s==null||s.length()<1) return 0; int len=0; int j=s.length()-1; for(;j>=0;j--){ if(s.charAt(j)!=' ') break; } for(int i=j;i>=0;i--){ if(s.charAt(i)==' ') break; len++; } return len; }