![]() ![]() Hence you should be able to use the LinkedList class in your program by including one of the following statements in your program. As shown, LinkedList class implements the List and Deque interfaces.Īs already mentioned, LinkedList class is a part of the “ java.util” package. The above diagram shows the hierarchy of the LinkedList class. Given below is the class hierarchy of the LinkedList class. The LinkedList class implements the List and Deque interfaces and inherits the AbstractList class. This class belongs to the “ java.util” package. In Java, the linked list is implemented by the “ LinkedList” class. We will discuss the doubly linked list in our next tutorial. In this LinkedList tutorial, we will deal mostly with the singly linked list. The previous pointer of the first node points to null while the next pointer of the last node points to null. The previous address of the first element in the LinkedList will be set to Null while the next pointer of the Last element in the LinkedList is set to Null.Īs shown in the above representation, each node in the doubly linked list has pointers to its previous and next node (thus represented without arrows). Address or reference or pointer to the next element in the LinkedList.Address or reference or pointer to the previous element in the LinkedList. ![]() There is another version known as “ Doubly Linked List” whose each node has three parts: ![]() The above diagram represents a “ Singly-linked List” that stores the address of only the next node in the LinkedList. As shown in the figure above, the address part of the last node in the LinkedList is set to ‘Null’ indicating the end of the LinkedList. The last node in the LinkedList is the tail. The “Head” of the LinkedList is a pointer that contains the address of the first element in the LinkedList. This arrangement is necessary as the data in LinkedList is stored in non-contiguous locations, unlike Arrays. Each node has two parts, the first part stores the data and the second part has a reference or pointer or address of the next node in the LinkedList. Singly-linked lists are a collection of nodes with each node holding a next pointer referencing the following node until the last node's next pointer points to null.Given below is the general Layout of LinkedList:Īs shown in the above representation of LinkedList, each item in the LinkedList is the “Node”. Here we’ll just be implementing the first. Now there are several types of linked lists such as singly and doubly-linked lists. This is the basic overview of the concept. It’s a collection of elements or nodes stored linearly with each node containing a pointer that references the next node in the list, therefore linking the entire collection of nodes with one another. So let’s start by going over what linked lists actually are and the types of linked lists you’re most likely to come across in the wild.Ī linked list is a data structure. Reversing a linked list involves several different steps that need to be implemented in a specific order. If you’re familiar with what linked lists are this problem may seem like a piece of cake. A common interview question you may come across if you’re applying for Software Engineer positions (especially at large FAANG types of companies) is to reverse a linked list. ![]()
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