Sparse Tables A sparse table refers to a table that is populated sparsely by data and most of its cells are empty With a sparse table, the table can be.

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Presentation transcript:

Sparse Tables A sparse table refers to a table that is populated sparsely by data and most of its cells are empty With a sparse table, the table can be replaced by a system of linked lists

Sparse Tables (continued) Figure 3-22 Arrays and sparse table used for storing student grades

Sparse Tables (continued) Figure 3-22 Arrays and sparse table used for storing student grades (continued)

Sparse Tables (continued) Figure 3-23 Two-dimensional arrays for storing student grades

Sparse Tables (continued) Figure 3-23 Two-dimensional arrays for storing student grades (continued)

Lists in java.util Figure 3-24 Student grades implemented using linked lists

Lists in java.util (continued) Figure 3-25 An alphabetical list of methods in the class LinkedList including some inherited methods

Lists in java.util (continued) Figure 3-25 An alphabetical list of methods in the class LinkedList including some inherited methods (continued)

Lists in java.util (continued) Figure 3-25 An alphabetical list of methods in the class LinkedList including some inherited methods (continued)

Lists in java.util (continued) Figure 3-25 An alphabetical list of methods in the class LinkedList including some inherited methods (continued)

Lists in java.util (continued) Figure 3-25 An alphabetical list of methods in the class LinkedList including some inherited methods (continued)

Lists in java.util (continued) Figure 3-25 An alphabetical list of methods in the class LinkedList including some inherited methods (continued)

Lists in java.util (continued) Figure 3-25 An alphabetical list of methods in the class LinkedList including some inherited methods (continued)

Lists in java.util (continued) Figure 3-26 A program demonstrating the operation of LinkedList methods

Lists in java.util (continued) Figure 3-26 A program demonstrating the operation of LinkedList methods (continued)

Lists in java.util (continued) Figure 3-26 A program demonstrating the operation of LinkedList methods (continued)

Lists in java.util (continued) Figure 3-27 An alphabetical list of methods in the class ArrayList

Lists in java.util (continued) Figure 3-27 An alphabetical list of methods in the class ArrayList (continued)

Lists in java.util (continued) Figure 3-27 An alphabetical list of methods in the class ArrayList (continued)

Lists in java.util (continued) Figure 3-27 An alphabetical list of methods in the class ArrayList (continued)

Lists in java.util (continued) Figure 3-27 An alphabetical list of methods in the class ArrayList (continued)

Lists in java.util (continued) Figure 3-28 A program demonstrating the operation of ArrayList methods

Lists in java.util (continued) Figure 3-28 A program demonstrating the operation of ArrayList methods (continued)

Case Study: A Library Figure 3-29 Linked lists indicating library status

Case Study: A Library (continued) Figure 3-30 Fragment of structure from Figure 3-29 with all the objects used in the implementation

Case Study: A Library (continued) Figure 3-31 The library program (continued)

Case Study: A Library (continued) Figure 3-31 The library program (continued)

Case Study: A Library (continued) Figure 3-31 The library program (continued)

Case Study: A Library (continued) Figure 3-31 The library program (continued)

Case Study: A Library (continued) Figure 3-31 The library program (continued)

Case Study: A Library (continued) Figure 3-31 The library program (continued)

Case Study: A Library (continued) Figure 3-31 The library program (continued)

Case Study: A Library (continued) Figure 3-31 The library program (continued)

Case Study: A Library (continued) Figure 3-31 The library program (continued)

Case Study: A Library (continued) Figure 3-31 The library program (continued)

Case Study: A Library (continued) Figure 3-31 The library program (continued)

Case Study: A Library (continued) Figure 3-31 The library program (continued)

Case Study: A Library (continued) Figure 3-31 The library program (continued)

Case Study: A Library (continued) Figure 3-31 The library program (continued)

Case Study: A Library (continued) Figure 3-31 The library program (continued)

Case Study: A Library (continued) Figure 3-31 The library program (continued)

Summary A linked structure is a collection of nodes storing data and links to other nodes. A linked list is a data structure composed of nodes, each node holding some information and a reference to another node in the list. A singly linked list is a node that has a link only to its successor in this sequence. A circular list is when nodes form a ring: The list is finite and each node has a successor.

Summary (continued) A skip list is a variant of the ordered linked list that makes a nonsequential search possible. There are four methods for organizing lists: move-to-front method, transpose method, count method, and ordering method. Optimal static ordering - all the data are already ordered by the frequency of their occurrence in the body of data so that the list is used only for searching, not for inserting new items.

Summary (continued) A sparse table refers to a table that is populated sparsely by data and most of its cells are empty. Linked lists allow easy insertion and deletion of information because such operations have a local impact on the list. The advantage of arrays over linked lists is that they allow random accessing.