The offerLast(E e) method of BlockingDeque inserts the element passed in the parameter at the end of the Deque container. If the container’s capacity has exceeded, then it does not returns an exception as in case of add() and addLast() function.
Syntax:
public boolean offerLast(E e)
Parameters: This method accepts a mandatory parameter e which is the element to be inserted at the end of the BlockingDeque.
Returns: This method returns true if the element has been inserted, else it returns false.
Note: The offerLast() method of BlockingDeque has been inherited from the LinkedBlockingDeque class in Java.
Below programs illustrate offerLast() method of BlockingDeque:
Program 1:
// Java Program Demonstrate offerLast()// 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.offerLast(7855642); BD.offerLast(35658786); BD.offerLast(5278367); BD.offerLast(74381793); // Cannot be inserted BD.offerLast(10); // cannot be inserted hence returns false if (!BD.offerLast(10)) System.out.println("The element 10 cannot be inserted" + " as capacity is full"); // before removing print queue System.out.println("Blocking Deque: " + BD); }} |
The element 10 cannot be inserted as capacity is full Blocking Deque: [7855642, 35658786, 5278367, 74381793]
Program 2:
// Java Program Demonstrate offerLast()// 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.offerLast("abc"); BD.offerLast("gopu"); BD.offerLast("geeks"); BD.offerLast("richik"); // Cannot be inserted BD.offerLast("hii"); // cannot be inserted hence returns false if (!BD.offerLast("hii")) System.out.println("The element 'hii' cannot be" + " inserted as capacity is full"); // before removing print queue System.out.println("Blocking Deque: " + BD); }} |
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#offerLast(E)