ArrayBlockingQueue peek() Method in Java
ArrayBlockingQueue is bounded, blocking queue that stores the elements internally backed by an array.
- ArrayBlockingQueue class is a member of the Java Collections Framework.
- Bounded means it will have a fixed size, you can not store number the elements more than the capacity of the queue.
- The queue also follows FIFO (first-in-first-out) rule for storing and removing elements from the queue.
- If you try to put an element into a full queue or to take an element from an empty queue then the queue will block you.
The peek() method is used to return the head of the queue. It retrieves but does not remove, the head of this queue. If the queue is empty then this method returns null.
public E peek()
Parameters: The method does not take any parameters.
Return Value: The method returns the element present at the head of this queue.
Below programs illustrate peek() method of ArrayBlockingQueue.
After addding numbers queue is [23, 32, 45, 12] Head of queue 23
Details of First User Inserted User Name : Aman User Age : 24
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