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E-grāmata: Java Design Patterns: A Hands-On Experience with Real-World Examples

3.40/5 (10 ratings by Goodreads)

Vaskaran Sarcar

Formāts: EPUB+DRM
Izdošanas datums: 19-May-2022
Izdevniecība: APress
Valoda: eng
ISBN-13: 9781484279717

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Formāts: EPUB+DRM
Izdošanas datums: 19-May-2022
Izdevniecība: APress
Valoda: eng
ISBN-13: 9781484279717

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Programming & scripting languages: general

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Use the step-by-step approach of this book to learn and implement design patterns in real-world applications. It focuses on classical design patterns with Java 17 and Eclipse (2021-09). In addition to Gang of Four (GoF) design patterns, the book covers popular and alternative design patterns and includes criticisms of design patterns in a chapter on anti-patterns. 

The book is divided into four parts. Part one covers the SOLID design principles and the Simple Factory pattern. Part two covers the 23 (GoF) design patterns, including the creational patterns, structural patterns, and behavioral patterns. Part three covers alternative design patterns, including the Null Object pattern, and the model-view-controller (MVC) pattern. Part four covers criticisms of design patterns with a quick overview of anti-patterns. It also includes a chapter on FAQs on design patterns.

The book also includes a chapter on FAQs on design patterns. Each pattern is explained with real-world examples and the pros and cons of each of the design patterns are discussed. The book concludes with FAQs that can help you prepare for a job interview.

What You Will Learn

Know the SOLID design principles in depth
Implement the 23 design patterns from the GoF
Know the criticism of design patterns 
Understand the anti-patterns
Verify your understanding through Q&A sessions
Select an alternative to these patterns by comparing their pros and cons

Who This Book Is For

Software developers, architects, and programmers

Intermediate-Advanced user level

About the Author

xxi

About the Technical Reviewers

xxiii

Acknowledgments

xxv

Introduction

xxvii

Part I Foundation

(76)

Chapter 1 Understanding SOLID Principles

(62)

Single Responsibility Principle

(7)

Initial Program

(1)

Demonstration 1

(2)

Output

(1)

Analysis

(1)

Better Program

(1)

Demonstration 2

(2)

Output

(1)

Open/Closed Principle

(17)

Initial Program

(2)

Demonstration 3

(3)

Output

(1)

Analysis

(1)

Better Program

(3)

Demonstration 4

(4)

Output

(1)

Analysis

(1)

Liskov Substitution Principle

(14)

Initial Program

(2)

Demonstrations

(2)

Output

(2)

Better Program

(1)

Demonstration 6

(4)

Output

(1)

Analysis

(1)

Interface Segregation Principle

(11)

Initial Program

(4)

Demonstration 7

(2)

Output

(1)

Analysis

(1)

Better Program

(1)

Demonstrations

(2)

Output

(1)

Analysis

(1)

Dependency Inversion Principle

(9)

Initial Program

(1)

Demonstration 9

(1)

Output

(1)

Analysis

(1)

Better Program

(1)

Demonstration 10

(2)

Output

(1)

Analysis

(2)

Summary

(2)

Chapter 2 Simple Factory Pattern

(12)

Definition

(1)

Concept

(1)

Real-Life Example

(1)

Computer World Example

(1)

Implementation

(7)

Class Diagram

(1)

Package Explorer View

(1)

Demonstration

(3)

Output

(1)

Analysis

(1)

Q&A Session

(4)

Final Comment

(1)

Part II The Gang of Four (GoF) Design Patterns

(498)

Chapter 3 Factory Method Pattern

(18)

GoF Definition

(1)

Concept

(1)

Real-Life Example

(1)

Computer World Example

(1)

Implementation

(7)

Class Diagram

(1)

Package Explorer View

(1)

Demonstration 1

(3)

Output

(1)

Modified Implementation

(4)

Demonstration 2

(3)

Output

(1)

Analysis

(1)

Q&A Session

(6)

Chapter 4 Abstract Factory Pattern

(22)

GoF Definition

(1)

Concept

(1)

Real-Life Example

(1)

Computer World Example

(1)

Implementation

(11)

Class Diagram

102

(1)

Package Explorer View

102

(2)

Demonstration 1

104

(5)

Output

109

(1)

Analysis

110

(1)

The Client Code Variations

110

(3)

Demonstration 2

110

(2)

Demonstration 3

112

(1)

Q&A Session

113

(6)

Chapter 5 Prototype Pattern

119

(30)

GoF Definition

119

(1)

Concept

119

(1)

Real-Life Example

120

(1)

Computer World Example

120

(1)

Implementation

121

(7)

Class Diagram

123

(1)

Package Explorer View

124

(1)

Demonstration 1

124

(4)

Output

128

(1)

Modified Implementation

128

(6)

Class Diagram

129

(1)

Demonstration 2

129

(2)

Output

131

(1)

Analysis

132

(1)

Further Improvements

133

(1)

Q&A Session

134

(1)

Shallow Copy vs. Deep Copy

135

(7)

Demonstration 3

136

(4)

Output From Shallow Copy Implementation

140

(1)

Analysis

140

(1)

Output From Deep Copy Implementation

141

(1)

Analysis

142

(1)

Q&A Session Continued

142

(7)

Demonstration 4

143

(3)

Output

146

(1)

Analysis

147

(2)

Chapter 6 Builder Pattern

149

(26)

GoF Definition

149

(1)

Concept

149

(2)

Real-Life Example

151

(1)

Computer World Example

151

(1)

Implementation

152

(11)

Class Diagram

155

(1)

Package Explorer View

155

(2)

Demonstration 1

157

(6)

Output

163

(1)

Q&A Session

163

(3)

Alternative Implementation

166

(7)

Demonstration 2

168

(5)

Output

173

(1)

Analysis

173

(1)

Q&A Session Continued

173

(2)

Chapter 7 Singleton Pattern

175

(16)

GoF Definition

175

(1)

Concept

175

(1)

Real-Life Example

175

(1)

Computer World Example

176

(1)

Implementation

176

(4)

Class Diagram

177

(1)

Package Explorer View

177

(1)

Demonstration 1

178

(1)

Output

179

(1)

Analysis

180

(1)

Q&A Session

180

(4)

Alternative Implementations

184

(5)

Demonstration 2 Eager Initialization

184

(1)

Analysis

184

(2)

Demonstration 3 Bill Pugh's Solution

186

(1)

Analysis

187

(1)

Demonstration 4 Enum Singleton

187

(1)

Analysis

188

(1)

Q&A Session Continued

189

(2)

Chapter 8 Proxy Pattern

191

(14)

GoF Definition

191

(1)

Concept

191

(1)

Real-Life Example

191

(1)

Computer World Example

192

(1)

Implementation

192

(6)

Class Diagram

194

(1)

Package Explorer View

195

(1)

Demonstration 1

195

(3)

Output

198

(1)

Q&A Session

198

(7)

Demonstration 2

200

(3)

Output

203

(2)

Chapter 9 Decorator Pattern

205

(22)

GoF Definition

205

(1)

Concept

205

(1)

Real-Life Example

206

(1)

Computer World Example

206

(1)

Implementation

207

(15)

Using Subclassing

207

(3)

Using Object Composition

210

(4)

Class Diagram

214

(1)

Package Explorer View

215

(1)

Demonstration

216

(4)

Output

220

(2)

Q&A Session

222

(5)

Chapter 10 Adapter Pattern

227

(22)

GoF Definition

227

(1)

Concept

227

(1)

Real-Life Example

228

(1)

Computer World Example

229

(1)

Implementation

229

(10)

Class Diagram

233

(1)

Package Explorer View

234

(1)

Demonstration 1

235

(3)

Output

238

(1)

Analysis

238

(1)

Types of Adapters

239

(1)

Object Adapters

239

(1)

Class Adapters

240

(1)

Q&A Session

240

(9)

Demonstration 2

240

(3)

Output

243

(1)

Analysis

244

(5)

Chapter 11 Facade Pattern

249

(14)

GoF Definition

249

(1)

Concept

249

(1)

Real-World Example

250

(1)

Computer World Example

250

(1)

Implementation

251

(9)

Class Diagram

254

(1)

Package Explorer View

254

(1)

Demonstration

255

(3)

Output

258

(2)

Analysis

260

(1)

Q&A Session

260

(3)

Chapter 12 Flyweight Pattern

263

(20)

GoF Definition

263

(1)

Concept

263

(1)

Real-Life Example

264

(1)

Computer World Example

265

(1)

Implementation

265

(14)

Class Diagram

270

(1)

Package Explorer View

270

(2)

Demonstration

272

(4)

Output

276

(2)

Analysis

278

(1)

Q&A Session

279

(4)

Chapter 13 Composite Pattern

283

(18)

GoF Definition

283

(1)

Concept

283

(1)

Real-Life Example

284

(1)

Computer World Example

284

(1)

Implementation

285

(13)

Class Diagram

286

(1)

Package Explorer View

286

(1)

Demonstration

287

(8)

Output

295

(2)

Analysis

297

(1)

Q&A Session

298

(3)

Chapter 14 Bridge Pattern

301

(26)

GoF Definition

301

(1)

Concept

301

(1)

Real-Life Example

301

(1)

Computer World Example

302

(1)

Implementation

303

(9)

Class Diagram

306

(1)

Package Explorer View

307

(1)

Demonstration 1

307

(5)

Output

312

(1)

Additional Implementation

312

(10)

Class Diagram

316

(1)

Demonstration 2

317

(5)

Output

322

(1)

Q&A Session

322

(5)

Chapter 15 Template Method Pattern

327

(16)

GoF Definition

327

(1)

Concept

327

(1)

Real-Life Example

328

(1)

Computer World Example

328

(1)

Implementation

328

(6)

Class Diagram

330

(1)

Package Explorer View

331

(1)

Demonstration 1

332

(2)

Output

334

(1)

Q&A Session

334

(9)

Demonstration 2

336

(4)

Output

340

(3)

Chapter 16 Observer Pattern

343

(24)

GoF Definition

343

(1)

Concept

343

(3)

Real-Life Example

346

(1)

Computer World Example

346

(2)

Implementation

348

(12)

Class Diagram

352

(1)

Package Explorer View

353

(1)

Demonstration

354

(5)

Output

359

(1)

Q&A Session

360

(7)

Chapter 17 Chain of Responsibility Pattern

367

(18)

GoF Definition

367

(1)

Concept

367

(1)

Real-Life Example

368

(1)

Computer World Example

368

(1)

Implementation

369

(12)

Class Diagram

374

(1)

Package Explorer View

374

(1)

Demonstration

375

(5)

Output

380

(1)

Q&A Session

381

(4)

Chapter 18 Iterator Pattern

385

(20)

GoF Definition

385

(1)

Concept

385

(1)

Real-Life Example

386

(1)

Computer World Example

387

(1)

Implementation

387

(11)

Class Diagram

390

(1)

Package Explorer View

390

(1)

Demonstration 1

391

(3)

Output

394

(1)

Additional Comments

394

(1)

Demonstration 2

395

(3)

Output

398

(1)

Q&A Session

398

(7)

Demonstration 3

400

(4)

Output

404

(1)

Chapter 19 Command Pattern

405

(30)

GoF Definition

405

(1)

Concept

405

(1)

Real-Life Example

406

(1)

Computer World Example

406

(1)

Implementation

407

(10)

Class Diagram

410

(1)

Package Explorer View

411

(1)

Demonstration 1

412

(4)

Output

416

(1)

Q&A Session

417

(4)

Modified Implementation

421

(14)

Class Diagram

425

(1)

Demonstration 2

425

(7)

Output

432

(3)

Chapter 20 Memento Pattern

435

(20)

GoF Definition

435

(1)

Concept

435

(1)

Real-Life Example

435

(1)

Computer World Example

436

(1)

Implementation

437

(9)

Class Diagram

441

(1)

Package Explorer View

441

(1)

Demonstration 1

442

(3)

Output

445

(1)

Analysis

446

(1)

Q&A Session

446

(3)

Additional Implementation

449

(6)

Class Diagram

450

(1)

Package Explorer View

450

(1)

Demonstration 2

451

(2)

Output

453

(1)

Analysis

454

(1)

Chapter 21 Strategy Pattern

455

(14)

GoF Definition

455

(1)

Concept

455

(1)

Real-Life Example

456

(1)

Computer World Example

456

(1)

Implementation

456

(9)

Class Diagram

459

(1)

Package Explorer View

460

(1)

Demonstration

461

(4)

Output

465

(1)

Q&A Session

465

(4)

Chapter 22 State Pattern

469

(20)

GoF Definition

469

(1)

Concept

469

(1)

Real-Life Example

470

(1)

Computer World Example

470

(1)

Implementation

470

(12)

Class Diagram

473

(1)

Package Explorer View

474

(1)

Demonstration

475

(5)

Output

480

(1)

Analysis

481

(1)

Q&A Session

482

(7)

Chapter 23 Mediator Pattern

489

(24)

GoF Definition

489

(1)

Concept

489

(1)

Real-Life Example

489

(1)

Computer World Example

490

(1)

Implementation

490

(13)

Class Diagram

495

(1)

Package Explorer View

496

(1)

Demonstration 1

497

(5)

Output

502

(1)

Analysis

502

(1)

Additional Implementation

503

(5)

Demonstration 2

504

(3)

Output

507

(1)

Analysis

508

(1)

Q&A Session

508

(5)

Chapter 24 Visitor Pattern

513

(36)

GoF Definition

513

(1)

Concept

513

(1)

Real-Life Example

514

(1)

Computer World Example

514

(1)

Implementation

515

(7)

Class Diagram

518

(1)

Package Explorer View

519

(1)

Demonstration 1

520

(2)

Output

522

(1)

Analysis

522

(1)

Using Visitor Pattern and Composite Pattern Together

522

(23)

Step 1

526

(1)

Step 2

526

(1)

Step 3

527

(1)

Step 4

527

(1)

Step 5

528

(1)

Demonstration 2

528

(8)

Output

536

(1)

Analysis

537

(1)

Demonstration 3

537

(7)

Output

544

(1)

Q&A Session

545

(4)

Chapter 25 Interpreter Pattern

549

(26)

GoF Definition

549

(1)

Concept

549

(3)

Real-Life Example

552

(1)

Computer World Example

552

(1)

Implementation

552

(16)

Class Diagram

558

(1)

Package Explorer View

559

(1)

Demonstration 1

560

(7)

Output

567

(1)

Analysis

568

(1)

Q&A Session

568

(1)

Alternative Implementation

569

(6)

Demonstration 2

570

(3)

Output

573

(2)

Part III Additional Design Patterns

575

(44)

Chapter 26 Null Object Pattern

577

(16)

Definition

577

(1)

Concept

577

(6)

A Faulty Program

578

(2)

Output

580

(1)

An Unwanted Input

581

(1)

The Potential Fix

582

(1)

Analysis

582

(1)

Real-Life Example

583

(1)

Computer World Example

583

(1)

Implementation

583

(7)

Class Diagram

585

(1)

Package Explorer View

585

(1)

Demonstration

586

(3)

Output

589

(1)

Analysis

590

(1)

Q&A Session

590

(3)

Chapter 27 MVC Pattern

593

(26)

Definition

593

(1)

Concept

594

(3)

Key Points to Remember

594

(2)

Variation 1

596

(1)

Variation 2

596

(1)

Variation 3

596

(1)

Real-Life Example

597

(1)

Computer World Example

597

(1)

Implementation

598

(14)

Class Diagram

602

(1)

Package Explorer View

602

(1)

Demonstration

603

(7)

Output

610

(2)

Q&A Session

612

(7)

Modified Output

614

(1)

Analysis

615

(4)

Part IV The Final Talks on Design Patterns

619

(22)

Chapter 28 Criticisms of Design Patterns

621

(6)

Q&A Session

624

(3)

Chapter 29 Anti-Patterns

627

(8)

Overview

627

(1)

Brief History of Anti-Patterns

628

(1)

Examples of Anti-Patterns

629

(2)

Types of Anti-Patterns

631

(1)

Q&A Session

632

(3)

Chapter 30 FAQ

635

(6)

Appendix A A Brief Overview of GoF Design Patterns

641

(8)

Q&A Session

645

(4)

Appendix B The Road Ahead

649

(2)

A Personal Appeal to You

650

(1)

Appendix C Recommended Reading

651

(2)

Index

653

Vaskaran Sarcar obtained his Master of Engineering degree in software engineering from Jadavpur University, Kolkata (India), and an MCA from Vidyasagar University, Midnapore (India). He has more than 12 years of experience in education and the IT industry. He devoted his early years (2005-2007) to teaching at various engineering colleges, and later he joined HP India PPS R&D Hub Bangalore. He worked there until August 2019. At the time of his retirement from HP, he was a Senior Software Engineer and Team Lead at HP. To follow his dream and passion, he is now an independent full-time author. He has written more than 10 books on Java and C# such as Design Patterns in C# (2nd edition), Getting Started with Advanced C#, Interactive C#, Interactive Object-Oriented Programming in Java (2nd edition), and Java Design Patterns (2nd edition).

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