![]() The Key is an object that is used to fetch and receive value associated with it. It stores its element in key-value pairs. Here, the HashMap is a class that is used to implement Map Interface. First of all, use generics: Map map new HashMap () Set keys map.keySet () Second, to convert the set to an array, you can use toArray (T a): Integer array keys.toArray (new Integer keys. HashMap x_coordinates = new HashMap() įor(int i=x_min i y_coordinates = new HashMap() įor (int x : values.subMap(x_min, x_max). How to get the keys from a list of Map of Strings I have a list of map of strings List
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