Java LinkedBlockingDeque addFirst() method

The addFirst() method of LinkedBlockingDeque class inserts the specified element at the front of this LinkedBlockingDeque. This method throws IllegalStateException if the specified element is null.

Syntax:

Parameters:

e- It is the element to add

Specified By:

The addFirst() method of ConcurrentLinkedQueue class is specified by :

addFirst in interface BlockingDeque<E>
addFirst in interface Deque<E>.

Throws:

NullPointerException: This exception will throw if the specified element e is null.

IllegalStateException: This exception will throw if this deque is full.

Example 1

import java.util.concurrent.LinkedBlockingDeque;
public class LinkedBlockingDequeAddFirstExample1 {
public static void main(String[] args) {
int capacity=100;
LinkedBlockingDeque<Integer>deque = new LinkedBlockingDeque<Integer>(capacity);
for (int i = 1; i <=5; i++) {
//  Adding items to the tail of this queue
deque.add(i);
        }
System.out.println(deque);
System.out.println("After inserting 10 at first position");
deque.addFirst(10);
System.out.println(deque);
    }
}

Test it Now

Output:

[1, 2, 3, 4, 5]
After inserting 10 at first position
[10, 1, 2, 3, 4, 5]

Example 2

import java.util.concurrent.LinkedBlockingDeque;
public class LinkedBlockingDequeAddFirstExample2 {
static  int i=1;
public static void main(String[] args) {
int capacity=100;
LinkedBlockingDeque<String>deque = new LinkedBlockingDeque<String>(capacity);
deque.add("Disha");
deque.add("Tanmay");
deque.add("Prachi");
deque.add("Garvit");
for (String xyz : deque){
System.out.println(i++ +". "+xyz);
}int i=1;
System.out.println("After adding string :");
deque.addFirst("Diya");
for (String xyz : deque){
System.out.println(i++ +". "+xyz);
        }
    }
}

Test it Now

Output:

1. Disha
2. Tanmay
3. Prachi
4. Garvit
After adding string :
1. Diya
2. Disha
3. Tanmay
4. Prachi
5. Garvit

Example 3

import java.util.concurrent.LinkedBlockingDeque;
public class LinkedBlockingDequeAddFirstExample3 {
static  int i=1;
public static void main(String[] args) {
int capacity=4;
LinkedBlockingDeque<String>deque = new LinkedBlockingDeque<String>(capacity);
deque.add("Disha");
deque.add("Tanmay");
deque.add("Prachi");
deque.add("Garvit");
deque.addFirst("Dia");
for (String xyz : deque){
System.out.println(i++ +". "+xyz);
        }
    }
}

Test it Now

Output:

Exception in thread "main" java.lang.IllegalStateException: Deque full
	at java.util.concurrent.LinkedBlockingDeque.addFirst(LinkedBlockingDeque.java:326)
	at com.javaTpoint.LinkedBlockingDequeAddFirstExample3.main
	(LinkedBlockingDequeAddFirstExample3.java:13)

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