![]() ![]() We can see that the same is also true when applied to Strings: PriorityQueue stringQueue = new PriorityQueue() ĪssertEquals("cherry", third) 6. If the task is successful, add () returns true, if not it throws an exception. Some of the commonly used methods of the Queue interface are: add () - Inserts the specified element into the queue. It is because Collection is the super interface of Queue. Let's take a look at how this works with a simple unit test: PriorityQueue integerQueue = new PriorityQueue() ĭespite the order in which our integers were added to the Priority Queue, we can see that the retrieval order is changed according to the natural order of the numbers. The Queue interface includes all the methods of the Collection interface. When new elements are inserted into the Priority Queue, they are ordered based on their natural ordering, or by a defined Comparator provided when we construct the Priority Queue. ![]() One such exception to this rule is the PriorityQueue.
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