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 contains(Object o) method returns true if queue contains the object o passed as parameter. We can say that method returns true if and only if this queue contains at least one element e which is equal to object o passed as parameter i.e. o.equals(e).
Syntax:
public boolean contains(Object o)
Parameter:
o – object to check whether queue contains the specified object.
Return Value:
true if this queue contains the object
Below program illustrate contains method of ArrayBlockingQueue.
Example 1
// Java Program Demonstrate contains(Object o) // method of ArrayBlockingQueue. import java.util.concurrent.ArrayBlockingQueue;
public class GFG {
public static void main(String[] args)
{
// define capacity of ArrayBlockingQueue
int capacity = 5;
// create object of ArrayBlockingQueue
ArrayBlockingQueue<Integer> queue
= new ArrayBlockingQueue<Integer>(capacity);
// Add elements to ArrayBlockingQueue
queue.add(23);
queue.add(32);
queue.add(45);
queue.add(12);
// check whether queue contains 23
boolean response1 = queue.contains(23);
// print after applying contains method with 23 as parameter
System.out.println("queue contains 23 : " + response1);
// check whether queue contains 99
boolean response2 = queue.contains(99);
// print after applying contains method with 99 as parameter
System.out.println("queue contains 99 : " + response2);
}
} |
Output:
queue contains 23 : true queue contains 99 : false
Example 2
// Java Program Demonstrate contains(Object o) // method of ArrayBlockingQueue. import java.util.concurrent.ArrayBlockingQueue;
public class GFG {
// create a User Object with name and age as attribute
public class User {
public String name;
public String age;
User(String name, String age)
{
this.name = name;
this.age = age;
}
}
// Main Method
public static void main(String[] args)
{
GFG gfg = new GFG();
gfg.containsMethodExample();
}
// Method to give example of contains function
public void containsMethodExample()
{
// define capacity of ArrayBlockingQueue
int capacity = 5;
// create object of ArrayBlockingQueue
ArrayBlockingQueue<User> queue
= new ArrayBlockingQueue<User>(capacity);
User user1 = new User("Aman", "24");
User user2 = new User("Amar", "23");
User user3 = new User("Sanjeet", "25");
User user4 = new User("Suvo", "26");
// Add Objects to ArrayBlockingQueue
queue.add(user1);
queue.add(user2);
queue.add(user3);
queue.add(user4);
User user5 = new User("Ravi", "22");
// check whether queue contains User1
boolean response1 = queue.contains(user1);
// print after applying contains method with user1 as parameter
System.out.println("queue contains User having name "
+ user1.name + " : " + response1);
// check whether queue contains User5
boolean response2 = queue.contains(user5);
// print after applying contains method with user1 as parameter
System.out.println("queue contains User having name "
+ user5.name + " : " + response2);
}
} |
Output:
queue contains User having name Aman : true queue contains User having name Ravi : false