ArrayBlockingQueueis a bounded queue and it is thread-safe. Internally, it uses a fixed-size array. Once the object is created, the size cannot be changed. The elements of this queue follow. Also, First-In-First-Out Elements are inserted at the end of the queue and retrieved from the head of the queue. nullobjects are not allowed as elements.
The contains method can be used to check if an element is present in the queue.
public boolean contains(Object o)
This method takes the element to be checked for availability as an argument.
This method returns true if the element is present in the queue. Otherwise, false will be returned.
The code below demonstrates how to use the contains method.
import java.util.concurrent.ArrayBlockingQueue;class Contains {public static void main( String args[] ) {ArrayBlockingQueue<String> queue = new ArrayBlockingQueue<>(5);queue.add("1");queue.add("2");queue.add("3");System.out.println("The queue is " + queue);System.out.println("queue.contains(1) - " + queue.contains("1"));System.out.println("queue.contains(4) - " + queue.contains("4"));}}
In the above code:
We imported the ArrayBlockingQueue from the java.util.concurrent package.
We created an object for the ArrayBlockingQueue class with the name queue and size 5.
We added three elements to the queue object.
We used the contains method to check if an element is present in the queue.
"1", the contains method returns true."4", the contains method returns false.