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ArrayDeque offer() Method in Java

Last Updated : 10 Dec, 2018
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The Java.util.ArrayDeque.offer(Object element) method in Java is used to add a specific element at the end of the Deque. The function is similar to the offerLast() method of ArrayDeque in Java. Syntax: 
Array_Deque.offer(Object element)
Parameters: The parameter element is of the type ArrayDeque and refers to the element to be added at the end of the Deque. Return Value: The function returns True if the element is successfully added into the deque else it returns false. Exceptions: The method throws NullPointerException if the passed parameter is NULL. Below programs illustrate the Java.util.ArrayDeque.offer() method: Program 1: Adding String elements into the Deque. Java 
// Java code to illustrate offer()
import java.util.*;

public class ArrayDequeDemo {
    public static void main(String args[])
    {
        // Creating an empty ArrayDeque
        Deque<String> de_que = new ArrayDeque<String>();

        // Use add() method to add elements into the Deque
        de_que.add("Welcome");
        de_que.add("To");
        de_que.add("Geeks");
        de_que.add("4");
        de_que.add("Geeks");

        // Displaying the ArrayDeque
        System.out.println("Initial Deque: " + de_que);

        // Using offer() to add elements
        de_que.offer("Hello");
        de_que.offer("World");

        // Displaying the ArrayDeque
        System.out.println("Final Deque: " + de_que);
    }
}
Output: 
Initial Deque: [Welcome, To, Geeks, 4, Geeks]
Final Deque: [Welcome, To, Geeks, 4, Geeks, Hello, World]
Program 2: Adding Integer elements into the Deque. Java 
// Java code to illustrate offer()
import java.util.*;

public class ArrayDequeDemo {
    public static void main(String args[])
    {
        // Creating an empty ArrayDeque
        Deque<Integer> de_que = new ArrayDeque<Integer>();

        // Use add() method to add elements into the Deque
        de_que.add(10);
        de_que.add(15);
        de_que.add(30);
        de_que.add(20);
        de_que.add(5);

        // Displaying the ArrayDeque
        System.out.println("Initial Deque: " + de_que);

        // Using offer() to add elements
        de_que.offer(1658);
        de_que.offer(2458);

        // Displaying the ArrayDeque
        System.out.println("Final Deque: " + de_que);
    }
}
Output: 
Initial Deque: [10, 15, 30, 20, 5]
Final Deque: [10, 15, 30, 20, 5, 1658, 2458]

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