BlockingDeque add() method in Java with Examples
Last Updated :
01 Oct, 2019
The add(E e) method of BlockingDeque inserts the element passed in the parameter to the end of the Deque is there is space. If the BlockingDeque is capacity restricted and no space is left for insertion, it returns an IllegalStateException. It works exactly in the same way as addLast() method does.
Syntax:
public void add(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 add() method of BlockingDeque has been inherited from the LinkedBlockingDeque class in Java.
Below programs illustrate add() method of Deque:
Program 1:
import java.util.concurrent.LinkedBlockingDeque;
import java.util.concurrent.BlockingDeque;
import java.util.*;
public class GFG {
public static void main(String[] args)
throws IllegalStateException
{
BlockingDeque<Integer> BD
= new LinkedBlockingDeque<Integer>();
BD.add( 7855642 );
BD.add( 35658786 );
BD.add( 5278367 );
BD.add( 74381793 );
System.out.println( "Blocking Deque: " + BD);
}
}
|
Output:
Blocking Deque: [7855642, 35658786, 5278367, 74381793]
Program 2:
import java.util.concurrent.LinkedBlockingDeque;
import java.util.concurrent.BlockingDeque;
import java.util.*;
public class GFG {
public static void main(String[] args)
throws IllegalStateException
{
BlockingDeque<Integer> BD
= new LinkedBlockingDeque<Integer>( 3 );
BD.add( 7855642 );
BD.add( 35658786 );
BD.add( 5278367 );
BD.add( 74381793 );
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 java.util.concurrent.LinkedBlockingDeque.add(LinkedBlockingDeque.java:633)
at GFG.main(GFG.java:24)
Program 3:
import java.util.concurrent.LinkedBlockingDeque;
import java.util.concurrent.BlockingDeque;
import java.util.*;
public class GFG {
public static void main(String[] args)
throws IllegalStateException
{
BlockingDeque<Integer> BD
= new LinkedBlockingDeque<Integer>();
BD.add( 7855642 );
BD.add( 35658786 );
BD.add( 5278367 );
BD.add( null );
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 java.util.concurrent.LinkedBlockingDeque.add(LinkedBlockingDeque.java:633)
at GFG.main(GFG.java:23)
Reference: https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/BlockingDeque.html#add(E)
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