The
putFirst(E e) method of
BlockingDeque inserts the specified element at the front of the queue represented by this deque. If the Deque is capacity restricted, then it will wait for the space to become available.
Syntax:
public void putFirst(E e)
Parameters: This method accepts a mandatory parameter
e which is the element to be inserted at the front 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 putFirst() method of
BlockingDeque has been inherited from the
LinkedBlockingDeque class in Java.
Below programs illustrate putFirst() method of BlockingDeque:
Program 1:
Output:
Blocking Deque: [74381793, 5278367, 35658786, 7855642]
Program 2:
Output:
Exception in thread "main" java.lang.NullPointerException
at java.util.concurrent.LinkedBlockingDeque.putFirst(LinkedBlockingDeque.java:373)
at GFG.main(GFG.java:24)
Program 3:
