javaqueueclonecloneable

How do I copy or clone a LinkedList-implemented Queue in Java?

I have a Queue q1, that is implemented as a LinkedList, and I want to define a Queue q2, that is a separate, but identical identical instance of Queue q1.

How do I do that since Queue does not implement Cloneable?

Solution

  • In a one liner:

    new LinkedList<>(myQueue);

    Since Queue extends Collection, and collections have a constructor that takes another Collection, this is a quick way to do a shallow clone.

    Substitute LinkedList with your own Queue implementation if you wish.

    Also, read the javadocs. They have all the answers.