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auberonedu
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Oct 7, 2025
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| public static void main(String[] args) { | ||
| // Create an empty ArrayList of Strings and assign it to a variable of type List | ||
| ArrayList<String> myStrings = new ArrayList<>(); |
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Here and elsewhere, use interface types (List, Map, etc.) where appropriate.
For example:
List<String> strings = new ArrayList<>();
Note that the type on the left is List, not ArrayList. When we do this, we're more flexible to be able to change our code to use a different type of list later.
Similarly for maps:
Map<String, String> myMap = new HashMap<>();
Note that on the left we use Map instead of HashMap.
In summary:
- interface type on left to declare type (List, Map, etc.)
- Concrete type on right to instantiate instance (HashMap, ArrayList etc.)
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Please review my assignment.