BlockingDeque addLast() method in Java with Examples
Last Updated :
12 Jul, 2025
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
// 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
// Java Program Demonstrate addLast()
// method of BlockingDeque
// when it is Full
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
// 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);
}
}
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
// 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);
}
}
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)