Java Deque offer() Method

The offer() method of Java Deque Interface inserts the given element into the queue which is represented by the particular deque.

Specified by:

offer in interface Queue<E>

Syntax:

Parameter:

The above method requires only one parameter :

The element 'e' that needs to be added.

Return:

The above method is used to return a Boolean value, i.e., true if the element is added to the queue. Otherwise, returns false.

Throw:

ClassCastException- If the class for the given element avoids it from being added to the deque.

NullPointerException- If the specified element is a null and the given deque does not allow the null elements.

IlleagalArgumentException- If some properties of the specified element prevents it from being added to the deque.

Example 1

import java.util.ArrayDeque;
import java.util.Deque;
public class JavaDequeofferExample1 {
   public static void main(String[] args) {
	Deque<String> deque = new ArrayDeque<>();
	  deque.offer("Tina");
	  deque.offer("Shyam");
	  deque.offer("Isha");
	  deque.offer("Falguni");
	System.out.println("The final deque is given as : ");    
	   for (String string : deque) {
		System.out.println(string);
	}   
   }
}

Test it Now

Output:

The final deque is given as : 
Tina
Shyam
Isha
Falguni

Example 2

import java.util.ArrayDeque;
import java.util.Deque;
public class JavaDequeofferExample2 {
   public static void main(String[] args) {
	Deque<Integer> deque = new ArrayDeque<>();
	  deque.offer(34);
	  deque.offer(43);
	  deque.offer(22);
	  deque.offer(55);
	System.out.println("The final deque is given as : ");    
	  for (Integer integer : deque) {
		System.out.println(integer);
	  }
	 }   
   }

Test it Now

Output:

The final deque is given as : [34, 43, 22, 55]
34
43
22
55

Example 3

import java.util.ArrayDeque;
import java.util.Deque;
public class JavaDequeofferExample3 {
   public static void main(String[] args) {
	Deque<Character> deque = new ArrayDeque<>();
	  deque.offer('H');
	  deque.offer('E');
	  deque.offer('L');
	  deque.offer('L');
	  deque.offer('O');
	System.out.println("The final deque is given as : ");    
	for (Character character : deque) {
		System.out.println(character);
    	}
     }
  }   

Test it Now

Output:

The final deque is given as : 
H
E
L
L
O

Next TopicJava Deque

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