一个字符串由a-z和逗号.组成，要求反转字符串，以逗号.分割。不能使用split

public class Test {

    public static void main(String[] arg0){
        String s = "asd....dfa...d.fee.c";
        System.out.println(new Test().getReverseStr(s));

    }
    public String getReverseStr(String s){
        if(s==null) {
            return null;
        }
        char[] chars = s.toCharArray();
        String temp = "";
        Stack<String> stack = new Stack();
        for (int i = 0; i < chars.length; i++) {
            if(chars[i]!='.') {
                if(temp.contains(".")) {
                    stack.push(temp);
                    temp = "";
                }
                temp+=chars[i];
            }else {
                if(!temp.contains(".")) {
                    stack.push(temp);
                    temp = "";
                }
                temp+=chars[i];
            }
        }
        stack.push(temp);

        String reverse = "";
        while (!stack.isEmpty()){
            reverse+=stack.pop();
        }

        return reverse;
    }
}

例：字符串s="asd....dfa...d.fee.c";

输出：