Collections

Question 1

What is a collection? Why is it necessary since we already have arrays?

Question 2

Which collection(s) should I avoid if the order of elements matters?

Question 3

True or false?: all collections are generic types.

Question 4

Which collection guarantees its elements are unique?

Question 5

If you’re not sure which collection to use, but you know you need a collection, what is a sensible collection to start with?

Question 6

Why would I use a Map? Share a concrete example.

Question 7

What is the difference between Map and HashMap?

Question 8

Did you use a List during training? For what?

Question 9

Which collection is fastest? Is it always?

Question 10

Which method should I call to make a collection grow?

Question 11

Name three collection types and their uses.