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Showing content from https://www.geeksforgeeks.org/java/concurrentlinkeddeque-add-method-in-java/ below:

ConcurrentLinkedDeque add() method in Java

Last Updated : 17 Sep, 2018

The

java.util.concurrent.ConcurrentLinkedDeque.add()

is an in-built function in Java which inserts the specified element at the end of the deque.

Syntax:

conn_linked_deque.add(elem)

Parameter:

The method accepts only a single parameter

elem

which is to be added to tail of the ConcurentLinkedDeque.

Return Value:

The function has no return value.

Exception:

The method will throw

NullPointerException

when the parameter passed to the function is

null

. Due to its bounded nature, this method will never throw

IllegalStateException

or return false. Below programs illustrate the ConcurrentLinkedDeque.add() method:

Program 1:

This program involves a ConcurrentLinkedDeque of Integer type.

Java


 // Java Program Demonstrate add()
// method of ConcurrentLinkedDeque 

import java.util.concurrent.*;

class ConcurrentLinkedDequeDemo {
    public static void main(String[] args)
    {
        ConcurrentLinkedDeque<Integer> cld = 
                     new ConcurrentLinkedDeque<Integer>();

        cld.add(12);
        cld.add(110);
        cld.add(55);
        cld.add(76);

        // Displaying the existing LinkedDeque
        System.out.println("Initial Elements in"
                           + "the LinkedDeque: " + cld);

        // Insert a new element in the  LinkedDeque
        cld.add(21);

        // Displaying the modified LinkedDeque
        System.out.println("Initial Elements in"
                           + "the LinkedDeque: " + cld);
    }
}

Output:

Initial Elements inthe LinkedDeque: [12, 110, 55, 76]
Initial Elements inthe LinkedDeque: [12, 110, 55, 76, 21]

Program 2:

This program involves a ConcurrentLinkedDeque of String type with Exception Handling when

null

is passed as parameter to the function.

Java


 // Java Program Demonstrate add()
// method of ConcurrentLinkedDeque 

import java.util.concurrent.*;

class ConcurrentLinkedDequeDemo {
    public static void main(String[] args)
    {
        ConcurrentLinkedDeque<String> cld = 
                       new ConcurrentLinkedDeque<String>();

        cld.add("Gfg");
        cld.add("GFG");
        cld.add("Geeksforgeeks");
        cld.add("Contribute");

        // Displaying the existing LinkedDeque
        System.out.println("Initial Elements in"
                           + "the LinkedDeque: " + cld);

        /* Exception thrown when null 
             is passed as parameter*/
        try {
            cld.add(null);
        }
        catch (NullPointerException e) {
            System.out.println("NullPointerException"
                               + "thrown");
        }

        // Insert a new element in the  LinkedDeque
        cld.add("Geek Classes");
        // Displaying the modified LinkedDeque
        System.out.println("Initial Elements in"
                           + "the LinkedDeque: " + cld);
    }
}

Output:

Initial Elements inthe LinkedDeque: [Gfg, GFG, Geeksforgeeks, Contribute]
NullPointerExceptionthrown
Initial Elements inthe LinkedDeque: [Gfg, GFG, Geeksforgeeks, Contribute, Geek Classes]

Reference: https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/ConcurrentLinkedDeque.html#add()

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