The putLast(E e) method of LinkedBlockingDeque inserts the specified element into the queue represented by this deque (in other words, at the tail/end of this deque). If the Deque is capacity restricted, then it will wait for the space to become available.
Syntax:
public void putLast(E e)
Parameters: This method accepts a mandatory parameter e which is the element to be inserted at the end of the LinkedBlockingDeque.
Returns: This method does not return anything.
Exceptions: The program throws two exceptions as shown below:
- NullPointerException – if the specified element is null
- InterruptedException – if interrupted while waiting
Below programs illustrate putLast() method of LinkedBlockingDeque:
Program 1:
// Java Program Demonstrate putLast()// method of LinkedBlockingDeque  import java.util.concurrent.LinkedBlockingDeque;import java.util.*;  public class GFG {    public static void main(String[] args)        throws InterruptedException    {          // create object of LinkedBlockingDeque        LinkedBlockingDeque<Integer> LBD            = new LinkedBlockingDeque<Integer>();          // Add numbers to end of LinkedBlockingDeque        LBD.putLast(7855642);        LBD.putLast(35658786);        LBD.putLast(5278367);        LBD.putLast(74381793);          // print Dequeue        System.out.println("Linked Blocking Deque: " + LBD);    }} |
Output:
Linked Blocking Deque: [7855642, 35658786, 5278367, 74381793]
Program 2:
// Java Program Demonstrate putLast()// method of LinkedBlockingDeque// throwing NullPointerException  import java.util.concurrent.LinkedBlockingDeque;import java.util.*;  public class GFG {    public static void main(String[] args)        throws InterruptedException    {          // create object of LinkedBlockingDeque        LinkedBlockingDeque<Integer> LBD            = new LinkedBlockingDeque<Integer>();          // Add numbers to end of LinkedBlockingDeque        LBD.putLast(7855642);        LBD.putLast(35658786);        LBD.putLast(5278367);          // throws an exception        LBD.putLast(null);          // print Dequeue        System.out.println("Linked Blocking Deque: " + LBD);    }} |
Output:
Runtime Errors:
Exception in thread "main" java.lang.NullPointerException
at java.util.concurrent.LinkedBlockingDeque.putLast(LinkedBlockingDeque.java:390)
at GFG.main(GFG.java:23)
Program 3:
// Java Program Demonstrate putLast()// method of LinkedBlockingDeque// when capacity exceeded  import java.util.concurrent.LinkedBlockingDeque;import java.util.*;  public class GFG {    public static void main(String[] args)        throws InterruptedException    {          // create object of LinkedBlockingDeque        LinkedBlockingDeque<Integer> LBD            = new LinkedBlockingDeque<Integer>(3);          // Add numbers to end of LinkedBlockingDeque        LBD.putLast(7855642);        LBD.putLast(35658786);        LBD.putLast(5278367);          // throws an exception        LBD.putLast(4356789);          // print Dequeue        System.out.println("Linked Blocking Deque: " + LBD);    }} |
Output:
Runtime Errors: Max real time limit exceeded due to either by heavy load on server or by using sleep function
Reference: https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/LinkedBlockingDeque.html#putLast-E-
