Java - How to check if the queue of type ArrayBlockedQueue of LinkedList [duplicate]

Question

if my method is accepting Queues from any type, how to determine if the method arg is ArrayBlockedQueue() or LinkedList() queue?

I used .equals as the following its always returning true

Queue q1 = new LinkedList();
Queue q2 = new ArrayBlockingQueue(4);
System.out.println(l1.equals(q1));

then I tried the following I have faced Illegal argument exception

public static void add2Q (Queue q)  {
    if(q.equals( new ArrayBlockingQueue(q.size()))){
        q.offer(2);
        q.offer(5);
        q.offer(9);
        q.offer(0);
        q.offer(-1);
    } else {
        // thorws exception with add if exceeded 
        try {
            q.add(2);
            q.add(5);
            q.add(4);
            q.add(9);
            q.add(10);
        } catch (IllegalStateException e){
            System.out.println("you are using ArrayBlockQueue of size "+ q.size() );
            //e.printStackTrace();
        }   
    }   
}

Why? You should not care. That's the whole point of being passed a Queue object instead of a specific type. — user207421
– user207421, Commented Nov 30, 2017 at 2:12
@EJP this is only for the sake of examining which method to use when adding element to the Queue — user6336
– user6336, Commented Nov 30, 2017 at 2:26

Nick · Accepted Answer · 2017-11-30 02:16:04Z

0

If you want to determine the type of object:

if (l1 instanceof LinkedList) {
   //Do something
}

The same solution will apply for other objects as well.

answered Nov 30, 2017 at 2:16

Nick

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