Java Crash Course: Implementing core Java features, including data types, operators, and flow control mechanisms

Cover....2 Title Page....3 Copyright Page....4 Dedication Page....5 About the Author....6 About the Reviewers....7 Acknowledgement....8 Preface....9 Table of Contents....16 1. Introduction to Java Programming....37 Introduction....37 Structure....37 Objectives....38 Overview of Java....38 Key features....38 Java architecture....40 Java platforms....40 History and evolution of Java....41 Rapid adoption....41 Oracle years....41 Ready for the future....42 Importance of Java....42 Javas relevance to modern software development....43 New paradigms....43 Security....44 Setting up the development environment....44 Downloading and installing the JDK....44 Setting up environment variables....46 Verify your installation....47 Choosing and configuring an IDE....47 Downloading and installing VS Code....48 Installing the Java extension pack....49 Writing and running your first Java program....51 Writing a Java program....51 Running a Java program....52 Conclusion....52 Points to remember....53 Case studies....53 Multiple choice questions....55 Answers....56 Questions....56 Challenges....57 Self-assessment....59 Answers....59 2. Core Java Concepts....61 Introduction....61 Structure....61 Objectives....62 Data types and variables....62 Variables....62 Variable naming conventions....63 Constants....63 Data types....64 Primitive data types....64 Reference data types....65 Declaring variables....65 Variable scope....65 Local variables....65 Instance variables....66 Class variables....66 Typecasting and conversion....67 Implicit casting....67 Explicit casting....68 Converting between integers and strings....68 Arithmetic operators....69 Assignment operators....70 Bitwise operators....71 Logical operators....72 Relational operators....73 Ternary operator....76 Unary operators....76 Control structures....78 Conditional statements....78 If....78 If-else....79 Else-if....79 Switch....79 Looping....80 For....80 While....81 Do-while....81 Branching....82 Break....82 Continue....82 Return....83 Methods....83 More on parameters....84 Scope....85 Detailed example....85 Best practices....90 Conclusion....91 Points to remember....91 Case studies....93 Multiple choice questions....97 Answers....98 Questions....98 Challenges....99 Self-assessment....101 Answers....102 3. Object-oriented Programming Basics....104 Introduction....104 Structure....104 Objectives....105 Introduction to OOP principles....105 Encapsulation....106 Inheritance....106 Polymorphism....107 Abstraction....108 Defining and using classes and objects....108 Defining a class....109 Creating an object....110 Initializing an object....111 Manipulating attributes....112 Constructors and overloading....114 Constructor overloading use case....115 Calling constructors....118 Benefits....119 Inheritance and the super keyword....120 Implementing inheritance....120 Full inheritance demonstration....123 Benefits....124 Polymorphism and method overriding....125 Method overriding....125 Dynamic method dispatch....126 Full implementation....127 Benefits....129 Access modifiers and encapsulation....129 Private....130 Protected....132 Full implementation....133 Conclusion....134 Points to remember....135 Case studies....136 Multiple choice questions....139 Answers....140 Questions....140 Challenges....141 Self-assessment....144 Answers....144 4. Advanced OOP Concepts....147 Introduction....147 Structure....148 Objectives....148 Introduction to interfaces....148 Syntax and implementation....149 Multiple inheritance....151 Polymorphism....153 Default and static methods....153 Working with abstract classes....155 Abstract class implementation....156 Wrapping up abstract classes....157 Multiple inheritance in Java via interfaces....158 Advantages and use cases....159 Practical application....159 Functional interfaces and default methods....161 Default methods....162 Lambdas and method references....163 Lambdas....163 Method references....165 Use cases....166 Object lifecycle....167 Object creation....167 Object use....168 Object destruction....169 Best practices....169 Minimize object creation....170 Manage object references....170 Explicitly close resources....170 Example....171 Conclusion....172 Points to remember....173 Case studies....174 Multiple choice questions....176 Answers....177 Questions....178 Challenges....179 Self-assessment....181 Answers....182 5. Handling Errors and Exceptions....185 Introduction....185 Structure....186 Objectives....186 Understanding Java exception hierarchy....186 Throwable class....187 Errors vs. exceptions....188 Throwable methods....190 Best practices....190 Checked vs. unchecked exceptions....191 Checked exceptions....191 Unchecked exceptions....193 Try-catch-finally blocks....194 Structure of try-catch-finally block....194 Try block....194 Catch block....194 Finally block....195 Multiple catch blocks....196 Best practices and pitfalls....197 Throwing exceptions and exception propagation....198 Throwing exceptions....198 Exception propagation....199 Closer look at the throws keyword....200 Best practices....201 Creating custom exceptions....202 Designing custom exceptions....202 Using a custom checked exception....204 Custom unchecked exceptions....205 Best practices....206 Testing exception handling....206 Testing checked exceptions....207 Testing unchecked exceptions....208 Testing custom exceptions....209 Exception properties validation....210 Best practices....211 Conclusion....212 Points to remember....213 Case studies....214 Multiple choice questions....217 Answers....218 Questions....218 Challenges....219 Self-assessment....222 Answers....223 6. Data Structures and Collections....226 Introduction....226 Structure....226 Objectives....227 Introduction to arrays and ArrayLists....227 Implementing arrays....228 Implementing ArrayLists....229 Java Collection Framework....230 Collection operations....231 Working with iterators and enhanced for loops....232 Iterators....232 Enhanced for loops....234 Sorting and searching collections....235 Sorting collections....235 Searching collections....237 Comparable vs. Comparator....240 Comparable....241 Comparator....243 Combined use....245 Using Javas utility classes....247 Primary utility classes....247 Dae....248 Calendar....248 Random....249 Scanner....250 Conclusion....250 Points to remember....251 Case studies....253 Multiple choice questions....254 Answers....255 Questions....256 Challenges....257 Self-assessment....259 Answers....260 7. Concurrency and Multithreading....262 Introduction....262 Structure....262 Objectives....263 Introduction to Java multithreading....263 Thread class and Runnable interface....265 Video game use case....266 Thread class in a video game....266 Runnable interface in a video game....267 Enterprise banking use case....268 Thread class in enterprise banking....268 Runnable interface in enterprise banking....270 Synchronization and locks....271 Using synchronization....271 Synchronization example....272 Using locks....274 Locks example....275 Avoiding deadlocks with tryLock....276 Example without blocking....277 Example of time out....278 Executor framework....280 Executor example for a video game....281 Executor example for a banking application....282 ScheduledExecutorService example....283 Concurrency utilities....284 CountDownLatch....284 CyclicBarrier....287 Semaphore....290 Best practices for writing concurrent code....291 Conclusion....293 Points to remember....294 Case studies....295 Multiple choice questions....298 Answers....300 Questions....300 Challenges....301 Self-assessment....304 Answers....305 8. Streams and Functional Programming....307 Introduction....307 Structure....308 Objectives....308 Introduction to Streams API....308 Streams API advantages....309 Examples....309 Intermediate and terminal operations....311 Intermediate operations....311 Terminal operations....312 Final thoughts on terminal operators....313 Functional interfaces....314 Functional interface examples....315 Using lambdas with streams....316 Lambada examples....317 Final thoughts on lambdas....318 Parallel streams....321 Considerations....321 Implementation....322 Parallel streams examples....322 Optional class and handling nulls....323 Implementing the Optional class....324 Optional class examples....324 Final thoughts on the Optional class....325 Conclusion....328 Points to remember....329 Case studies....330 Multiple choice questions....332 Answers....333 Questions....334 Challenges....335 Self-assessment....337 Answers....338 9. InputOutput....340 Introduction....340 Structure....340 Objectives....341 Introduction to Java IO....341 Overview of IO streams....342 Introduction to character streams....342 Introduction to byte streams....343 Importance of IO in programming....344 Handling user input....344 Managing file storage....344 Buffered streams....345 Object persistence....345 Network communication....346 Using the Scanner class for input....346 Overview of the Scanner class....346 Reading input from the console....349 Reading and parsing data from files....350 Common pitfalls and best practices....352 Best practices....355 File handling with java.nio....356 Basics of working with files in Java....356 Reading and writing text files using java.nio....357 Working with serialization and deserialization....361 Storing and retrieving objects from files....362 Serialization....362 Deserialization....364 Serialization and deserialization examples....365 Appending serialized data without overwriting....365 Handling class version changes....367 Improving performance with buffered streams....368 Buffered streams and data streams....370 Using buffered streams for efficiency....371 Overview of DataInputStream and DataOutputStream....373 DataOutputStream....373 DataInputStream....374 Handling character and byte streams....375 Difference between character and byte streams....375 Character streams....375 Byte streams....376 Use cases for each type of stream....377 Usage of character streams....377 Usage of byte streams....378 Conclusion....379 Points to remember....380 Case studies....381 Multiple choice questions....383 Answers....385 Questions....385 Challenges....386 Self-assessment....389 Answers....390 10. Database Connectivity....392 Introduction....392 Structure....393 Objectives....393 Introduction to databases for Java applications....393 Overview of relational databases....394 Storing and managing structured data....396 Data consistency....396 Managing relationships....397 Storing and managing data....397 Optimizing data storage....398 mportance of databases in Java applications....399 Persistent data storage....399 Efficient searches....399 Data consistency and integrity....400 Multi-user access....401 Scalability....401 Security....401 Working with databases in Java....402 Basic SQL operations....402 Retrieving data....402 Adding data....403 Updating data....403 Deleting data....403 Executing SQL queries....404 Using SQLite....405 Creating the Bougie Books database....407 Using JDBC for database connectivity....409 Transaction management....410 Database operations best practices....412 Preventing SQL injection....412 Optimizing query performance....413 Managing database connections....414 Handling query results....415 Handle errors and exceptions....415 Conclusion....417 Points to remember....417 Case studies....419 Multiple choice questions....421 Answers....422 Questions....422 Challenges....423 Self-assessment....426 Answers....427 11. GUI Programming....429 Introduction....429 Structure....430 Objectives....430 Basics of JavaFX....430 Architecture....431 PFT planning....432 Setting up a JavaFX environment....433 Prerequisites....433 Java Development Kit....433 JavaFX SDK....434 VS Code and extensions....434 Creating a JavaFX project....435 Next steps and PFT....437 Understanding the scene graph....438 Core components....438 Setting up the PFT stage and scene....439 Layouts, controls, and event handling....442 Layouts....442 Input controls....446 Handling events....447 Binding properties and observables....451 Implementing binding properties....452 Implementing observables....457 Completing the PFT application....458 Window size....458 UI styling....458 Transaction table....459 Adding timestamps....459 Store time stamps and enable deletion....460 Data persistence....462 Final review....464 Conclusion....474 Points to remember....475 Case studies....476 Multiple choice questions....478 Answers....479 Questions....480 Challenges....481 Self-assessment....483 Answers....484 12. Modern Java Features....487 Introduction....487 Structure....487 Objectives....488 Overview of modern Java....488 Release cycle....489 Modern Java themes....489 Project Jigsaw....491 Module system....491 Implementation benefits....492 Using modules....493 Recent Java enhancements....495 Pattern matching....495 Pattern matching with instanceof....495 Pattern matching with switch....496 Records....497 Sealed classes....498 Virtual threads....499 Java 24, including JEP 477....500 JEP 477....501 Additional enhancements....502 Best practices....502 Use records....503 Use pattern matching....503 Implement virtual threads....504 Implement modular design....505 Additional considerations....505 Conclusion....506 Points to remember....507 Case studies....508 Multiple choice questions....510 Answers....511 Questions....512 Challenges....513 Self-assessment....516 Answers....517 13. Debugging, Testing, and Deployment....519 Introduction....519 Structure....520 Objectives....520 Debugging in Java....520 IDE debugging tools....522 Breakpoints....522 Call stack inspection....523 Console logging....524 Step execution....525 Debugging strategies....525 Unit testing with JUnit....526 JUnit setup....527 Writing testable code....528 Avoid hardcoded dependencies....529 Implement interfaces....529 Return values....531 Avoid static methods....531 Avoid global variables....532 Testable methods....533 Testing code in VS Code....533 Test-driven development....534 Applying TDD....535 Packaging and deploying Java applications....536 Compile....537 Create JAR files....538 Make a runnable JAR....538 Include external dependencies....539 Deploy....539 Local deployment....539 Server deployment....540 Introduction to build tools....540 Conclusion....541 Points to remember....542 Case studies....543 Multiple choice questions....545 Answers....546 Questions....547 Challenges....548 Self-assessment....550 Answers....551 14. Real-world Java Projects....554 Introduction....554 Structure....554 Objectives....555 Building a simple command-line application....555 Design....556 Implementation....557 Testing....558 Extending the project....559 Developing a basic database application....559 Design....560 Implementation....562 Database initialization....562 Menu system....564 Adding functionality....566 Testing....567 Extending the project....567 Building a multithreaded data processor....568 Design....568 Implementation....570 Testing....573 Extending the project....573 Writing a functional program using streams and lambdas....574 Design....575 Implementation....575 Testing....576 Extending the project....576 Conclusion....577 Points to remember....577 Case studies....579 Multiple choice questions....581 Answers....582 Questions....582 Challenges....583 Self-assessment....585 Answers....586 15. Conclusion and Next Steps....588 Introduction....588 Structure....588 Objectives....589 Trends in Java development....589 Continuing your Java learning....589 Recommended resources....590 Preparing for industry certifications....591 Certifications matter....591 Certification options....591 Oracle....592 BlueCert....592 University certificates....593 Preparation strategies....593 Final thoughts....593 Conclusion....594 Points to remember....594 Case studies....595 Multiple choice questions....597 Answers....598 Questions....598 Challenges....599 Self-assessment....601 Answers....602 Index....604