Java Deque add() Method

The add() method of Deque interface is used to insert the specified element into the specified queue represented by the deque and returns true upon success and throws an IllegalStateException if there is no current space available.

Specified by:

add in interface Collection<E>
add in interface Queue<E>

Syntax:

Parameter:

The above method consists of only one parameter:

The element 'e' that needs to be added.

Return:

The above method returns a Boolean value, i.e., true.

Example 1

import java.util.ArrayDeque;
import java.util.Deque;
public class JavaDequeaddExample1 {
   public static void main(String[] args) {
	  Deque< String> deque = new ArrayDeque<String>();
	    deque.addLast("Sunday");
	    deque.addLast("Monday");
	    deque.addLast("Tuesday");
	    deque.addLast("Wednesday");
	    deque.addLast("Thursday");
	    deque.addLast("Friday");
	    deque.addLast("Saturday");
   System.out.println("Week : "+deque);
   }
}

Test it Now

Output:

Week : [Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday]

Example 2

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

public class JavaDequeaddExample2 {
   public static void main(String[] args) {
Deque<Integer> deque = new ArrayDeque<Integer>();
   // Adds the element.
    deque.add(2);
    deque.add(4);
    deque.add(6);
    deque.add(8);
    deque.add(10);
    System.out.println("The sequence is given as : ");
    for (Integer integer : deque) {
    	System.out.println(integer);
    }
   }
}

Test it Now

Output:

The sequence is given as : 
2
4
6
8
10

Example 3

import java.util.ArrayDeque;
import java.util.Deque;
import java.util.Scanner;
public class JavaDequeaddExample3 {
    public static void main(String[] args) {
    Scanner scanner = new Scanner(System.in);
	Deque<String> deque1 = new ArrayDeque<String>();
	System.out.println("Enter the name : ");
    String str1 = scanner.next();
    deque1.add(str1);
    String str2 = scanner.next();
    deque1.add(str2);
    String str3 = scanner.next();
    deque1.add(str3);
    System.out.println("The deque is given as : "+deque1);
    }
}

Output:

Enter the name : 
Tina
Shyam
Falguni
The deque is given as : [Tina, Shyam, Falguni]

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