![]() This operation has a time complexity of O(1). The expanded two-Node singly linked list places Node B ahead of Node A The resulting two- Node list appears in Figure 3. This operation is demonstrated by the following pseudocode: Inserting a node into a singly linked list is somewhat more complicated than creating a singly linked list because there are three cases to consider:Ī new node is inserted before the first node by assigning the top node's reference to the new node's link field and assigning the new node's reference to the top variable. Recall that O(1) is pronounced "Big Oh of 1." (See Part 1 for a reminder of how time and space complexity measurements are used to evaluate data structures.) Inserting nodes into a singly linked list This operation has a time complexity of O(1)-constant. The initial singly linked list consists of a single Node (A) ![]() The following pseudocode creates a Node object, assigns its reference to top, initializes its data field, and assigns NULL to its link field:įigure 2 shows the initial singly linked list that emerges from this pseudocode. You create a singly linked list by attaching a single Node object. Because the list doesn't yet exist, top's initial value is NULL. top is a reference variable of type Node that holds a reference to the first Node object in a singly linked list. Node is a self-referential class with a name data field and a next link field. A singly linked list where top references the A node, A connects to B, B connects to C, and C is the final nodeīelow is pseudocode for a singly linked list. Although the reference variable is commonly named top, you can choose any name you want.įigure 1 presents a singly linked list with three nodes. In this data structure, a reference variable contains a reference to the first (or top) node each node (except for the last or bottom node) links to the next one and the last node's link field contains the null reference to signify the list's end. What is a singly linked list?Ī singly linked list is a linked list of nodes where each node has a single link field. We'll also explore algorithms most commonly used for sorting singly linked lists, and conclude with an example demonstrating the Insertion Sort algorithm.ĭownload the three example applications for this article. This tutorial introduces the ins and outs of singly linked lists in Java programming. You'll learn operations for creating a singly linked list, inserting nodes into a singly linked list, deleting nodes from a singly linked list, concatenating a singly linked list to another singly linked list, and inverting a singly linked list. ![]() This field is an example of a link field because it can store a reference to another object of its class-in this case another Employee object. In this example, Employee is a self-referential class because its next field has type Employee. Nodes in a linked list are linked via a node reference. Recall that a node is an object created from a self-referential class, and a self-referential class has at least one field whose reference type is the class name. ![]() Unlike a sequence of elements, however, a linked list is a sequence of nodes, where each node is linked to the previous and next node in the sequence. Like arrays, which were introduced in Part 3 of this tutorial series, linked lists are a fundamental data structure category upon which more complex data structures can be based.
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