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Java 9 Data Structures and Algorithms

Java 9 Data Structures and Algorithms PDF

Author: Debasish Ray Chawdhuri

Publisher: Packt Publishing


Publish Date: April 28, 2017

ISBN-10: 1785889346

Pages: 340

File Type: Epub, Mobi, Pdf

Language: English

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Book Preface

Java has been one of the most popular programming languages for enterprise systems for decades now. One of the reasons for the popularity of Java is its platform independence, which lets one write and compile code on any system and run it on any other system, irrespective of the hardware and the operating system. Another reason for Java’s popularity is that the language is standardized by a community of industry players. The latter enables Java to stay updated with the most recent programming ideas without being overloaded with too many useless features.

Given the popularity of Java, there are plenty of developers actively involved in Java development. When it comes to learning algorithms, it is best to use the language that one is most comfortable with. This means that it makes a lot of sense to write an algorithm book, with the implementations written in Java. This book covers the most commonly used data structures and algorithms. It is meant for people who already know Java but are not familiar with algorithms. The book should serve as the first stepping stone towards learning the subject.

What this book covers

Chapter 1, Why Bother? – Basic, introduces the point of studying algorithms and data structures with examples. In doing so, it introduces you to the concept of asymptotic complexity, big O notation, and other notations.

Chapter 2, Cogs and Pulleys – Building Blocks, introduces you to array and the different kinds of linked lists, and their advantages and disadvantages. These data structures will be used in later chapters for implementing abstract data structures.

Chapter 3, Protocols – Abstract Data Types, introduces you to the concept of abstract data types and introduces stacks, queues, and double-ended queues. It also covers different implementations using the data structures described in the previous chapter.

Chapter 4, Detour – Functional Programming, introduces you to the functional programming ideas appropriate for a Java programmer. The chapter also introduces the lambda feature of Java, available from Java 8, and helps readers get used to the functional way of implementing algorithms. This chapter also introduces you to the concept of monads.

Chapter 5, Efficient Searching – Binary Search and Sorting, introduces efficient searching using binary searches on a sorted list. It then goes on to describe basic algorithms used to obtain a sorted array so that binary searching can be done.

Chapter 6, Efficient Sorting – Quicksort and Mergesort, introduces the two most popular and efficient sorting algorithms. The chapter also provides an analysis of why this is as optimal as a comparison-based sorting algorithm can ever be.

Chapter 7, Concepts of Tree, introduces the concept of a tree. It especially introduces binary trees, and also covers different traversals of the tree: breadth-first and depth-first, and pre-order, post-order, and in-order traversal of binary tree.

Chapter 8, More About Search – Search Trees and Hash Tables, covers search using balanced binary search trees, namely AVL, and red-black trees and hash-tables.

Chapter 9, Advanced General Purpose Data Structures, introduces priority queues and their implementation with a heap and a binomial forest. At the end, the chapter introduces sorting with a priority queue.

Chapter 10, Concepts of Graph, introduces the concepts of directed and undirected graphs. Then, it discusses the representation of a graph in memory. Depth-first and breadth-first traversals are covered, the concept of a minimum-spanning tree is introduced, and cycle detection is discussed.

Chapter 11, Reactive Programming, introduces the reader to the concept of reactive programming in Java. This includes the implementation of an observable pattern-based reactive programming framework and a functional API on top of it. Examples are shown to demonstrate the performance gain and ease of use of the reactive framework, compared with a traditional imperative style.

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