Which of the following collections maintain an order of the elements in the collection (multiple responses are allowed)a.ArrayListb.Arrayc.HashMapd.HashSete.all of the above
Question
Which of the following collections maintain an order of the elements in the collection (multiple responses are allowed)a.ArrayListb.Arrayc.HashMapd.HashSete.all of the above
Solution
The collections that maintain an order of the elements in the collection are:
a. ArrayList - ArrayList is a resizable array implementation of the List interface. It maintains the insertion order, i.e., the order in which elements are added to the ArrayList is the order in which they are retrieved.
b. Array - An array is a simple data structure to store a collection of elements. The elements in an array are accessed by their index. The array maintains the order of elements based on the index.
c. HashMap - HashMap does not maintain any order of its elements. The order of elements can be different than the order in which they were inserted.
d. HashSet - HashSet also does not maintain any order of its elements. It does not guarantee that the order will remain constant over time.
So, the correct answer is ArrayList and Array.
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