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BlockingDeque offer() function in Java with Examples
  • Last Updated : 01 Oct, 2019

The offer(E e) method of BlockingDeque inserts the element passed in the parameter to the end of the Deque. If the container’s capacity has exceeded, then it does not returns an exception as in case of add() and addFirst() function.

Syntax:

public boolean offer(E e)

Parameters: This method accepts a mandatory parameter e which is the element to be inserted in the end of the BlockingDeque.

Returns: This method returns true if the element has been inserted, else it returns false.

Note: The offer() method of BlockingDeque has been inherited from the LinkedBlockingDeque class in Java.



Below programs illustrate offer() method of BlockingDeque:

Program 1:




// Java Program Demonstrate offer()
// method of BlockingDeque
  
import java.util.concurrent.LinkedBlockingDeque;
import java.util.concurrent.BlockingDeque;
import java.util.*;
  
public class GFG {
    public static void main(String[] args)
        throws IllegalStateException
    {
  
        // create object of BlockingDeque
        BlockingDeque<Integer> BD
            = new LinkedBlockingDeque<Integer>(4);
  
        // Add numbers to end of BlockingDeque
        BD.offer(7855642);
        BD.offer(35658786);
        BD.offer(5278367);
        BD.offer(74381793);
  
        // Cannot be inserted
        BD.offer(10);
  
        // cannot be inserted hence returns false
        if (!BD.offer(10))
            System.out.println("The element 10 cannot be inserted"
                               + " as capacity is full");
  
        // before removing print queue
        System.out.println("Blocking Deque: " + BD);
    }
}
Output:
The element 10 cannot be inserted as capacity is full
Blocking Deque: [7855642, 35658786, 5278367, 74381793]

Program 2:




// Java Program Demonstrate offer()
// method of BlockingDeque
  
import java.util.concurrent.LinkedBlockingDeque;
import java.util.concurrent.BlockingDeque;
import java.util.*;
  
public class GFG {
    public static void main(String[] args)
        throws IllegalStateException
    {
  
        // create object of BlockingDeque
        BlockingDeque<String> BD
            = new LinkedBlockingDeque<String>(4);
  
        // Add numbers to end of BlockingDeque
        BD.offer("abc");
        BD.offer("gopu");
        BD.offer("geeks");
        BD.offer("richik");
  
        // Cannot be inserted
        BD.offer("hii");
  
        // cannot be inserted hence returns false
        if (!BD.offer("hii"))
            System.out.println("The element 'hii' cannot be inserted"
                               + " as capacity is full");
  
        // before removing print queue
        System.out.println("Linked Blocking Deque: " + BD);
    }
}
Output:
The element 'hii' cannot be inserted as capacity is full
Blocking Deque: [abc, gopu, geeks, richik]

Reference: https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/BlockingDeque.html#offer(E)

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