Dimensions expected after this token

在宣告 Map 物件時, 需注意內部的<key, value>宣告用法
裡頭不得為常用的 int , 而必須是 Integer

否則會出現"Syntax error on token "int", Dimensions expected after this token "

Example:
(X) Map<String, int> list_test = new TreeMap<String, int>();
(O) Map<String, Integer> list_test = new TreeMap<String, Integer>();