Java Queue of Interface type

Question

I'm trying to make a queue of an interfaced type Player because I don't know what type of player will be in the queue, ie human, AI etc so I have an interface for what different players can do, ie makemove etc.

Queue<Player> players = new Queue<Player>();

However, queue cannot be instantiated because Player is an interface. How do I create a queue of an interfaced type?

but there are different types of Player implementation? How can I store them all in one queue? — Alex
– Alex, Commented Nov 8, 2014 at 16:28
What is the exact and complete error message you get from the compiler? Reading it helps. Hint: Queue is an interface. You should choose what kind of Queue you want. — JB Nizet
– JB Nizet, Commented Nov 8, 2014 at 16:28
@hagu what you proposed in your comment and what appears in the answer are completley different. — Sotirios Delimanolis
– Sotirios Delimanolis, Commented Nov 8, 2014 at 16:36

khelwood · Accepted Answer · 2014-11-08 16:29:14Z

2

You can have a variable of type Queue<Player>, but Queue itself is just an interface. You need to instantiate a concrete implementation of Queue, such as LinkedList.

e.g.

Queue<Player> players = new LinkedList<Player>();

answered Nov 8, 2014 at 16:29

khelwood

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