The addLast(E e) method of BlockingDeque inserts the element passed in the parameter to the end of the Deque if there is space. If the BlockingDeque is capacity restricted and no space is left for insertion, it returns an IllegalStateException.
Syntax:
public void addLast(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 does not returns anything.
Exception:
- IllegalStateException: if the element cannot be added at this time due to capacity restrictions
- NullPointerException: if the specified element is null
Note: The addLast() method of BlockingDeque has been inherited from the LinkedBlockingDeque class in Java.
Below programs illustrate addLast() method of BlockingDeque:
Program 1:
// Java Program Demonstrate addLast()// 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>();          // Add numbers to end of BlockingDeque        BD.addLast(7855642);        BD.addLast(35658786);        BD.addLast(5278367);        BD.addLast(74381793);          // before removing print Deque        System.out.println("Blocking Deque: " + BD);    }} |
Output:
Blocking Deque: [7855642, 35658786, 5278367, 74381793]
Program 2:
// Java Program Demonstrate addLast()// method of BlockingDeque// when it is Fullimport 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        // size of list        BlockingDeque<Integer> BD            = new LinkedBlockingDeque<Integer>(3);          // Add numbers to end of BlockingDeque        BD.addLast(7855642);        BD.addLast(35658786);        BD.addLast(5278367);          // it is full        BD.addLast(74381793);          // before removing print Deque        System.out.println("Blocking Deque: " + BD);    }} |
Output:
Exception in thread "main" java.lang.IllegalStateException: Deque full
at java.util.concurrent.LinkedBlockingDeque.addLast(LinkedBlockingDeque.java:335)
at GFG.main(GFG.java:25)
Program 3:
// Java Program Demonstrate addLast()// method of BlockingDeque// when nill is inserted  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>();          // Add numbers to end of BlockingDeque        BD.addLast(7855642);        BD.addLast(35658786);        BD.addLast(5278367);          // NULL        BD.addLast(null);          // before removing print queue        System.out.println("Blocking Deque: " + BD);    }} |
Output:
Exception in thread "main" java.lang.NullPointerException
at java.util.concurrent.LinkedBlockingDeque.offerLast(LinkedBlockingDeque.java:357)
at java.util.concurrent.LinkedBlockingDeque.addLast(LinkedBlockingDeque.java:334)
at GFG.main(GFG.java:24)
Reference: https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/BlockingDeque.html#addLast(E)
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