LeetCode: Reverse Words in a String

Given an input string, reverse the string word by word.

For example,
Given s = "the sky is blue",
return "blue is sky the".

很简单一个题目

把答案贴出来，赞一个，一次性通过

	public String reverseWords(String s) {
	String res = "";
	ArrayList<String> al = new ArrayList<String>();
	if(s==null||s.length()==0) return res;
	for(int i=0; i<s.length(); i++){
	if(s.charAt(i)==' ') continue;
	int start = i;
	while(i<s.length() && s.charAt(i)!=' ')
	i++;
	al.add(0, s.substring(start, i));
	}
	for(int i=0; i<al.size(); i++){
	res += al.get(i);
	res += " ";
	}
	if(res.length()>0)
	return res.substring(0, res.length()-1);
	else
	return res;
	}

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