What is the Deque.removeFirst() method in Java?
Overview
The Deque.removeFirst() method is present in the Deque interface inside the java.util package.
Deque.removeFirst() is used to remove the element from the front of the deque.
Syntax
boolean removeFirst(element)
Parameters
The Deque.removeFirst() method doesn’t take any parameters.
Return value
The Deque.removeFirst() method returns a boolean value:
True: The element is successfully removed from the front of the deque.False: The element is not successfully removed from the front of the deque.
Example
Let us take a look at the code snippet below.
import java.util.*;class Main{public static void main(String[] args){Deque<Integer> d = new LinkedList<Integer>();d.add(212);d.add(23);d.add(621);d.add(1280);d.add(3121);d.add(18297);d.add(791);d.removeFirst();d.removeFirst();System.out.println("Elements in the deque are: "+d);}}
Code explanation
-
Line 1: We import the required package.
-
Line 2: We make a
Mainclass. -
Line 4: We make a
mainfunction. -
Line 6: We declare a deque that consists of
Integertype elements. -
Lines 8 - 14: We use the
Deque.add()method to insert the elements in the deque. -
Lines 16 and 17: We use the
removeFirst()method to remove the elements from the front of the deque. -
Line 21: We display the deque elements.
Note: The first two elements have been removed.
In this way, we can use the Deque.removeFirst() method in Java.
