Hey Dev.to folks! π
When dealing with a doubly linked list, there's an easy way to check if it's a full house or a lonely room.π₯³ Here comes the isEmpty()
method.
π Quick Doubly Linked List Refresher:
Before we dive in, let's recall our framework:
class Node {
int data;
Node next;
Node prev;
// Constructor: Crafting our node from scratch
Node(int data) {
this.data = data;
this.next = null;
this.prev = null;
}
}
class DoublyLinkedList {
Node head;
Node tail;
// Constructor: Setting the stage
DoublyLinkedList() {
this.head = null;
this.tail = null;
}
}
Remember, each node in our doubly linked list has knowledge of both its previous and next neighbor. π€
π΅οΈββοΈ Diving into isEmpty()
:
Here's the quick insight on how...:
public boolean isEmpty() {
return head == null; // If no head, no party!
}
Super straightforward, right? If there's no head node, then the list is empty!
π Why isEmpty()
is Your New BFF(I mean FOREVER!):
Ever tried inserting or deleting from a list? Knowing whether itβs populated can save you from situations you would not admit later on in life. Trying to work with non-existent nodes___? π€·ββοΈ
π Wrapping Things Up:
The isEmpty()
method: your first line of defense. It ensures you're not talking to yourself (though a rubber duck can help to catch thoughts π¦ ), and trust me, thatβs a great feature to have.
Cheers and happy coding! π
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