Java Long class

Java LinkedBlockingDeque addFirst() method

Last Updated : 17 Mar 2025

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);
    }
}

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);
        }
    }
}

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);
        }
    }
}

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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Java LinkedBlockingDeque addFirst() method

Syntax:

Parameters:

Specified By:

Throws:

Example 1

Example 2

Example 3

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Java LinkedBlockingDeque addFirst() method

Syntax:

Parameters:

Specified By:

Throws:

Example 1

Example 2

Example 3

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