{"id":5788,"date":"2021-10-14T10:54:32","date_gmt":"2021-10-14T10:54:32","guid":{"rendered":"https:\/\/www.prepbytes.com\/blog\/?p=5788"},"modified":"2023-07-31T04:59:11","modified_gmt":"2023-07-31T04:59:11","slug":"how-to-implement-generic-linkedlist-in-java","status":"publish","type":"post","link":"https:\/\/prepbytes.com\/blog\/how-to-implement-generic-linkedlist-in-java\/","title":{"rendered":"How to Implement Generic LinkedList in java"},"content":{"rendered":"

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Mastering the Linked List data structure is of utmost importance when gearing up for interviews. A comprehensive grasp of Linked Lists can offer significant advantages during coding interviews.<\/p>\n

In this tutorial, we will learn how to implement a generic linked list in java that can work with multiple data types. A Linked List is a linear Data Structure, which consists of a group of nodes, which are stored at random addresses. Each node consists of 2 parts:<\/p>\n

Data<\/strong>: The Data which is stored at the particular address.
\nReference<\/strong>: The address of the next node of the linked list.<\/p>\n

What is a Generic Linked List in Java?<\/h2>\n

A generic linked list, also known as a template linked list or a polymorphic linked list, is a data structure that allows for the storage of elements of different data types in a single linked list. In programming languages that support generics or templates, such as C++ or Java, a generic linked list can be created using templates or generic classes.<\/p>\n

The idea behind a generic linked list is to provide a flexible and reusable data structure that can hold elements of various data types without the need to create separate linked lists for each data type. This allows for code reusability and simplifies the implementation of algorithms that need to work with different types of data.<\/p>\n

For example, a generic linked list could store integers, strings, or custom objects, making it a versatile tool in various programming applications. The ability to work with different data types while maintaining the structure and functionality of a linked list makes generic linked lists a powerful and efficient data structure in modern programming languages.<\/p>\n

In this article, we will learn how to implement a generic LinkedList class that can work with multiple data types.<\/p>\n

We will implement the following member functions in our LinkedList class:<\/p>\n

    \n
  • addNode(T data) – This method will add a new element at the end of LinkedList.<\/li>\n
  • addNode(int position, T data) – This method will add a new element at a particular position in the LinkedList.<\/li>\n
  • removeNode(T key) – This method will remove a node from the LinkedList.<\/li>\n
  • clearList() – This method will clear the whole LinkedList.<\/li>\n
  • isEmpty() – This method will check whether a LinkedList is empty or not.<\/li>\n
  • length() – This method will return the length of the LinkedList.<\/li>\n<\/ul>\n

    Note<\/strong>: Here, T represents the type of data which will be stored in the linked list.<\/p>\n

    Example 1<\/strong>: Implementation of add(T data), add(int position, T data), removeNode(T key)<\/p>\n

    Code:<\/h3>\n\t\t\t\t\t\t