Java Deque addLast() Method

The addLast() method of Java Deque Interface is used to insert the specified element at the end of the deque.

Syntax:

Parameter:

The above method consists of only one parameter:

The element 'e' that needs to be inserted.

Return:

Throw:

IllegalStateException- If the elements cannot be added at the time due to capacity restriction.

ClassCastException- If the class of the specified element avoids it from being added to the deque.

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

IllegalArgumentException- If some of the property of the given element avoids it from being added to the deque.

Example 1

import java.util.ArrayDeque;
import java.util.Deque;
public class JavaDequeaddLastExample1 {
  public static void main(String[] args) {
		Deque<Integer> deque = new ArrayDeque<>();
		deque.addLast(44);
		deque.addLast(33);
		deque.addLast(22);
		deque.addLast(11);
    	System.out.println("The elements are adding at the front of the deque : "+deque);   	 
	}
}

Test it Now

Output:

The elements are adding at the front of the deque : [44, 33, 22, 11]

Example 2

import java.util.ArrayDeque;
import java.util.Deque;
public class JavaDequeaddLastExample2 {
	   public static void main(String[] args) {
		   Deque<String> deque = new ArrayDeque<>();
			deque.addLast("FAT");
			deque.addLast("CAO");
			deque.addLast ("JAVA");
			deque.addLast ("DBMS");
	   	System.out.println("The subjects are given as : "+deque); 
	  }
}

Test it Now

Output:

The subjects are given as : [FAT, CAO, JAVA, DBMS]

Example 3

import java.util.ArrayDeque;
import java.util.Deque;
import java.util.Scanner;
public class JavaDequeaddLastExample3 {
    public static void main(String[] args) {
    	 System.out.print("Enter the number of times you want to enter the names : ");
    	 Scanner scanner = new Scanner(System.in);
    	 int n = scanner.nextInt();
    	
    	 Deque<String> deque = new ArrayDeque<String>();
    	 System.out.println("The names are : ");
    	 for (int i = 0; i < n; i++) {
    	  String name = scanner.next();
    	  deque.addLast(name);
    	  }
    	 System.out.println("The final deque is : "+deque);
       }
    }

Output:

Enter the number of times you want to enter the names : 4
The names are : 
Ashu
Hitesh
Jasmeet
Isha
The final deque is : [Ashu, Hitesh, Jasmeet, Isha]

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