Java ArrayDeque offerLast(E) Method

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Description

The Java ArrayDeque offerLast(E e) method inserts the specified element E at the end of this deque. It is similar to add() or addLast() method.

Declaration

Following is the declaration for java.util.ArrayDeque.offerLast() method

public boolean offerLast(E e)

Parameters

e − The element to be added at the end.

Return Value

This method returns true if the element was added to this deque, else false.

Exception

NullPointerException − if the specified element is null.

Adding Element to the Last of an ArrayDeque of Integers Example

The following example shows the usage of Java ArrayDeque offerLast(E) method with Integers. We're adding few elements to list using add() method and then using offerLast() method, we're adding two elements in the end. Lastly we're printing the ArrayDeque object to see the final result.

package com.tutorialspoint;

import java.util.ArrayDeque;
import java.util.Deque;

public class ArrayDequeDemo {
   public static void main(String[] args) {

      // create an empty array deque
      Deque<Integer> deque = new ArrayDeque<>();

      // use add() method to add elements in the deque
      deque.add(1);
      deque.add(2);
      deque.add(3);
      deque.add(4);        
      deque.add(5);
      deque.add(6);

      // the values will be printed in the same order
      deque.offerLast(7);
      deque.offerLast(8);

      // let us print all the elements available in deque
      System.out.println("ArrayDeque = " + deque);      
   }
}

Output

Let us compile and run the above program, this will produce the following result −

ArrayDeque = [1, 2, 3, 4, 5, 6, 7, 8]

Adding Element to the Last of an ArrayDeque of Strings Example

The following example shows the usage of Java ArrayDeque offerLast(E) method with Strings. We're adding few elements to list using add() method and then using offerLast() method, we're adding two elements in the end. Lastly we're printing the ArrayDeque object to see the final result.

package com.tutorialspoint;

import java.util.ArrayDeque;
import java.util.Deque;

public class ArrayDequeDemo {
   public static void main(String[] args) {

      // create an empty array deque
      Deque<String> deque = new ArrayDeque<>();

      // use add() method to add elements in the deque
      deque.add("A");
      deque.add("B");
      deque.add("C");
      deque.add("D");        
      deque.add("E");
      deque.add("F");

      // the values will be printed in the same order
      deque.offerLast("G");
      deque.offerLast("H");

      // let us print all the elements available in deque
      System.out.println("ArrayDeque = " + deque);      
   }
}

Output

Let us compile and run the above program, this will produce the following result −

ArrayDeque = [A, B, C, D, E, F, G, H]

Adding Element to the Last of an ArrayDeque of Objects Example

The following example shows the usage of Java ArrayDeque offerLast(E) method with Student objects. We're adding few elements to list using add() method and then using offerLast() method, we're adding two elements in the end. Lastly we're printing the ArrayDeque object to see the final result.

package com.tutorialspoint;

import java.util.ArrayDeque;
import java.util.Deque;

public class ArrayDequeDemo {
   public static void main(String[] args) {

      // create an empty array deque
      Deque<Student> deque = new ArrayDeque<>();

      // use add() method to add elements in the deque
      deque.add(new Student(1, "Julie"));
      deque.add(new Student(2, "Robert"));
      deque.add(new Student(3, "Adam"));

      // use offerLast() method to add element at the end of the deque
      deque.offerLast(new Student(4, "Rohan"));
      deque.offerLast(new Student(5, "Sohan"));

      // let us print all the elements available in deque
      System.out.println("ArrayDeque = " + deque);      
   }
}

class Student {
   int rollNo;
   String name;

   Student(int rollNo, String name){
      this.rollNo = rollNo;
      this.name = name;
   }

   @Override
   public String toString() {
      return "[ " + this.rollNo + ", " + this.name + " ]";
   }
}

Output

Let us compile and run the above program, this will produce the following result −

ArrayDeque = [[ 1, Julie ], [ 2, Robert ], [ 3, Adam ], [ 4, Rohan ], [ 5, Sohan ]]