BlockingDeque putLast() function in Java with Examples
The putLast(E e) method of BlockingDeque 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 BlockingDeque.
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
Note: The putLast() method of BlockingDeque has been inherited from the LinkedBlockingDeque class in Java.
Below programs illustrate putLast() method of BlockingDeque:
Program 1:
// Java Program Demonstrate putLast() // 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 InterruptedException { // create object of BlockingDeque BlockingDeque<Integer> BD = new LinkedBlockingDeque<Integer>(); // Add numbers to end of BlockingDeque BD.putLast(7855642); BD.putLast(35658786); BD.putLast(5278367); BD.putLast(74381793); // print Dequeue System.out.println("Blocking Deque: " + BD); } } |
Blocking Deque: [7855642, 35658786, 5278367, 74381793]
Program 2:
// Java Program Demonstrate putLast() // method of BlockingDeque // throwing NullPointerException import java.util.concurrent.LinkedBlockingDeque; import java.util.concurrent.BlockingDeque; import java.util.*; public class GFG { public static void main(String[] args) throws InterruptedException { // create object of BlockingDeque BlockingDeque<Integer> BD = new LinkedBlockingDeque<Integer>(); // Add numbers to end of BlockingDeque BD.putLast(7855642); BD.putLast(35658786); BD.putLast(5278367); // throws an exception BD.putLast(null); // print Dequeue System.out.println("Blocking Deque: " + BD); } } |
Output:
Exception in thread "main" java.lang.NullPointerException
at java.util.concurrent.LinkedBlockingDeque.putLast(LinkedBlockingDeque.java:390)
at GFG.main(GFG.java:24)
Program 3:
// Java Program Demonstrate putLast() // method of BlockingDeque // when capacity exceeded import java.util.concurrent.LinkedBlockingDeque; import java.util.concurrent.BlockingDeque; import java.util.*; public class GFG { public static void main(String[] args) throws InterruptedException { // create object of BlockingDeque BlockingDeque<Integer> BD = new LinkedBlockingDeque<Integer>(3); // Add numbers to end of BlockingDeque BD.putLast(7855642); BD.putLast(35658786); BD.putLast(5278367); // throws an exception BD.putLast(4356789); // print Dequeue System.out.println("Blocking Deque: " + BD); } } |
Output:
Max real time limit exceeded due to either by heavy load on server or by using sleep function
Reference: https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/BlockingDeque.html#putLast(E)