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ArrayDeque add() Method in Java

Last Updated : 10 Dec, 2018

The Java.util.ArrayDeque.add(

) method in Java is used to add a specific element at the end of the Deque. The function is similar to the addLast() method of ArrayDeque in Java.

Array_Deque.add(Object element)

The parameter

is of the type ArrayDeque and refers to the element to be added to the Deque.

The function returns True if the element is successfully added into the deque else it returns false.

The method throws

if the passed parameter is NULL. Below programs illustrate the Java.util.ArrayDeque.add() method:

Adding String elements into the Deque.

// Java code to illustrate add()
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("ArrayDeque: " + de_que);
    }
}

ArrayDeque: [Welcome, To, Geeks, 4, Geeks]

Adding Integer elements into the Deque.

// Java code to illustrate add()
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("ArrayDeque: " + de_que);
    }
}

ArrayDeque: [10, 15, 30, 20, 5]

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