Deque getLast() method in Java

The getLast() method of Deque Interface returns the last element or the tail of the Deque. It does not deletes the element. It throws an exception when the Deque is empty.

Syntax:

E getLast()

Parameters: This method does not accepts any parameter.

Returns: Thie method returns the last element or the tail of the Deque but does not delete it.

Exception: The function throws NoSuchElementException when the Deque is empty and the function is called.



Below programs illustrate getLast() method of Deque:

Program 1: With the help of LinkedList.

filter_none

edit
close

play_arrow

link
brightness_4
code

// Java Program Demonstrate getLast()
// method of Deque
import java.util.*;
  
public class GFG {
    public static void main(String[] args)
        throws IllegalStateException
    {
  
        // create object of Deque
        Deque<Integer> DQ
            = new LinkedList<Integer>();
  
        // Add numbers to end of Deque
        DQ.add(7855642);
        DQ.add(35658786);
        DQ.add(5278367);
        DQ.add(74381793);
  
        // print Deque
        System.out.println("Deque: " + DQ);
  
        // print head
        System.out.println("Deque's head: " + DQ.getLast());
    }
}

chevron_right


Output:

Deque: [7855642, 35658786, 5278367, 74381793]
Deque's head: 74381793

Program 2: With the help of ArrayDeque.

filter_none

edit
close

play_arrow

link
brightness_4
code

// Java Program Demonstrate getLast()
// method of Deque
import java.util.*;
  
public class GFG {
    public static void main(String[] args)
        throws IllegalStateException
    {
  
        // create object of Deque
        Deque<Integer> DQ
            = new ArrayDeque<Integer>();
  
        // Add numbers to end of Deque
        DQ.add(7855642);
        DQ.add(35658786);
        DQ.add(5278367);
        DQ.add(74381793);
  
        // print Deque
        System.out.println("Deque: " + DQ);
  
        // print head
        System.out.println("Deque's head: " + DQ.getLast());
    }
}

chevron_right


Output:

Deque: [7855642, 35658786, 5278367, 74381793]
Deque's head: 74381793

Program 3: With the help of ConcurrentLinkedDeque.

filter_none

edit
close

play_arrow

link
brightness_4
code

// Java Program Demonstrate getLast()
// method of Deque
import java.util.*;
import java.util.concurrent.ConcurrentLinkedDeque;
  
public class GFG {
    public static void main(String[] args)
        throws IllegalStateException
    {
  
        // create object of Deque
        Deque<Integer> DQ
            = new ConcurrentLinkedDeque<Integer>();
  
        // Add numbers to end of Deque
        DQ.add(7855642);
        DQ.add(35658786);
        DQ.add(5278367);
        DQ.add(74381793);
  
        // print Deque
        System.out.println("Deque: " + DQ);
  
        // print head
        System.out.println("Deque's head: " + DQ.getLast());
    }
}

chevron_right


Output:

Deque: [7855642, 35658786, 5278367, 74381793]
Deque's head: 74381793

Program 4: With the help of LinkedBlockingDeque.

filter_none

edit
close

play_arrow

link
brightness_4
code

// Java Program Demonstrate getLast()
// method of Deque
import java.util.*;
import java.util.concurrent.LinkedBlockingDeque;
  
public class GFG {
    public static void main(String[] args)
        throws IllegalStateException
    {
  
        // create object of Deque
        Deque<Integer> DQ
            = new LinkedBlockingDeque<Integer>();
  
        // Add numbers to end of Deque
        DQ.add(7855642);
        DQ.add(35658786);
        DQ.add(5278367);
        DQ.add(74381793);
  
        // print Deque
        System.out.println("Deque: " + DQ);
  
        // print head
        System.out.println("Deque's head: " + DQ.getLast());
    }
}

chevron_right


Output:

Deque: [7855642, 35658786, 5278367, 74381793]
Deque's head: 74381793

Program 5:

filter_none

edit
close

play_arrow

link
brightness_4
code

// Java Program Demonstrate getLast()()
// method of Deque when it is empty
import java.util.*;
  
public class GFG {
    public static void main(String[] args)
        throws IllegalStateException
    {
  
        // create object of Deque
        Deque<Integer> DQ
            = new LinkedList<Integer>();
  
        // Add numbers to end of Deque
        DQ.add(7855642);
        DQ.add(35658786);
        DQ.add(5278367);
        DQ.add(74381793);
  
        // print Deque
        System.out.println("Deque: " + DQ);
  
        // print head
        System.out.println("Deque's head: " + DQ.getLast());
  
        DQ.clear();
  
        // Deque is empty now hence exception
        System.out.println("Deque's head: " + DQ.getLast());
    }
}

chevron_right


Output:

Exception in thread "main" java.util.NoSuchElementException
    at java.util.LinkedList.getLast(LinkedList.java:257)
    at GFG.main(GFG.java:29)

Reference: https://docs.oracle.com/javase/8/docs/api/java/util/Deque.html#getLast–

Attention reader! Don’t stop learning now. Get hold of all the important Java and Collections concepts with the Fundamentals of Java and Java Collections Course at a student-friendly price and become industry ready.




My Personal Notes arrow_drop_up

Check out this Author's contributed articles.

If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.