In arrays, elements can be added at the beginning in the following manner
int[] array = {1,2,3,4,5};
similarly how to add multiple entries to a Queue? like,
Queue<Integer> queue = {1,2,3,4,5};
is there any way to do this?
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1 Answer
First you must choose which Queue implementation you wish to instantiate. Let's assume you are choosing LinkedList (which implements Queue).
Like any Collection, LinkedList has a constructor that takes a Collection and adds the elements of that Collection to the list.
For example:
Queue<Integer> queue = new LinkedList<>(Arrays.asList(new Integer[]{1,2,3,4,5}));
or (as PaulrBear correctly commented):
Queue<Integer> queue = new LinkedList<>(Arrays.asList(1,2,3,4,5));
Or you can take advantage of Java 8 Streams :
Queue<Integer> queue = IntStream.of(1,2,3,4,5)
.boxed()
.collect(Collectors.toCollection(LinkedList::new));
2 Comments
Paul Wintz
The first solution can be simplified to: Queue<Integer> queue = new LinkedList<>(Arrays.asList(1,2,3,4,5));
Eran
@PaulrBear You are correct. Thanks for the comment.