Java Challengers
Java Challengers
Master the Java Fundamentals with fun Java Code Challenges! Become a Java Challenger!
About the Book
To get the best jobs and create high-quality code, you need to know Java very well. The Java Challenges book is a powerful way for you to master the fundamentals of Java by having fun with code challenges so you become a well-prepared highly employable Java Challenger Developer.
This book contains more than 70 well-elaborated Java Challenges that will help you break your limits on your Java skills. Want to challenge yourself and become better? The Java Challenges is the book for you!
About the Author
Table of Contents
-
Foreword
- Jeanne Boyarsky
-
1 Introduction
- 1.2 Why Java?
- 1.3 What kinds of concepts are in this book?
- 1.4 Who is this book for?
- 1.5 What are the Java Challenges?
- 1.6 Disclaimer about the Java Challenges
- 1.7 Java versioning and tools
- 1.8 Will this book prepare you for the software development market?
-
2 Variable types and flow control (Review)
- 2.1 A Brief Review about Algorithms
- 2.2 Arithmetic Operators
- 2.3 Flow Control
- 2.4 Loops
- 2.5 Arrays
- 2.6 Local variable restrictions
- 2.7 Candy Price Code Challenge
- 2.8 Summary
-
3 Basic object-oriented programming (Review)
- 3.1 Classes
- 3.2 Methods
- 3.3 The Keyword this
- 3.4 Constructors
- 3.5 Object references
- 3.6 Arrays are objects in Java
- 3.7 Bank Deposit/Withdraw Challenge
- 3.8 Summary
-
4 Encapsulation access modifiers, and package structure
- 4.1 Programming to interfaces
- 4.2 What are and how to use getters and setters?
- 4.3 The Builder Design Pattern
- 4.4 Organizing Packages in a Real Project
- 4.5 Encapsulation Patterns
- 4.6 Access Modifiers
- 4.7 Inner Class
- 4.8 The static keyword
- 4.9 Instance and static block
- 4.10 Small Real-World Project Challenge
- 4.11 Summary
-
5 Overloading
- 5.1 Overloading basics
- 5.2 Wrappers and autoboxing
- 5.3 Varargs
- 5.4 Overloading Real-World Usage Challenge
- 5.5 Summary
-
6 Inheritance and Polymorphism
- 6.1 When to use inheritance
- 6.2 Every Class is an Object
- 6.3 Checking the type of an object
-
6.4 The
toStringmethod - 6.5 Access modifiers and inheritance
- 6.6 Object composition
- 6.7 Multiple inheritance in Java
- 6.8 Using super to access a parent class’s methods
- 6.9 Constructors and inheritance
- 6.10 Class casting
- 6.11 Preventing inheritance
- 6.12 Abstract classes
- 6.13 Factory Method Strategy Discount Real-world Challenge
- 6.14 Summary
-
7 Interfaces
- 7.1 Interfaces and Polymorphism
- 7.2 Covariant return types
- 7.3 Default methods
- 7.4 Abstract classes vs. interfaces
- 7.5 Static methods in interfaces
- 7.6 Simulating multiple inheritance with default methods
- 7.7 Private methods in interfaces
- 7.8 Command Design Pattern Challenge
- 7.9 Summary
-
8 Exceptions
- 8.1 Checked and unchecked exceptions
- 8.2 Stack Trace
- 8.3 Handling or Declaring Checked Exceptions
- 8.4 try, catch, finally
- 8.6 try with resources
- 8.7 Multi catch
- 8.8 Creating a customized exception
- 8.9 Throw early, catch late
- 8.10 Real World Exception Creation Challenge
- 8.11 Summary
-
9 Lambdas and Functional Interfaces
- 9.1 What is Lambda?
- 9.2 Functional Interfaces
- 9.3 Method Reference
- 9.4 Lambda Method Reference Matcher Challenge:
- 9.5 Summary
-
10 Optional
- 10.1 Wrapping a value into Optional
- 10.2 isPresent and isEmpty
- 10.3 Optional Antipatterns
- 10.4 ifPresent and ifPresentOrElse
- 10.6 Handling Exceptions with orElseThrow
- 10.7 Transforming Optional Data
- 10.8 Final Yoshi Food Optional Challenge
- 10.9 Summary
-
11 Generics and Object Comparison
- 11.1 Comparing objects with equals and hashcode
- 11.2 Generics
- 11.4 Upper and Lower Bound Generics
- 11.5 Summary
-
12 Collections
- 12.1 Collections API
- 12.2 List
- 12.3 ArrayList
- 12.4 Vector
- 12.5 Deque & Stack
-
12.6
ConcurrentModificationException - 12.7 Using Comparable
- 12.8 Set
- 12.9 HashSet
- 12.10 LinkedHashSet
- 12.11 TreeSet
- 12.12 Map
- 12.16 TreeMap
- 12.17 Elements Searching
- 12.18 Summary
-
13 Streams
- 13.1 Streams Basic Principles
- 13.2 Creating a Stream
- 13.3 Intermediate VS Terminal Operation Methods
- 13.4 Intermediate Operations
- 13.5 Terminal Operations
- 13.6 Parallelizing Data Processing with parallel()
- 13.7 Collecting Data with collect()
- 13.8 Collectors.groupingBy
- 13.9 Summary
-
14 Newest Features of Java
- 14.1 Java Release Strategy
- 14.2 Introduction to Modules
- 14.3 Java JDK Base Modules
- 14.4 Named application module
- 14.5 Unnamed module
- 14.6 Exporting Packages from Module
- 14.7 Requiring a Module
- 14.8 Exporting a service with provides with
- 14.9 Module Reflection Access
- 14.10 Star Trek Planets Module Special Challenge
- 14.11 Reserved word var
- 14.12 New switch case statement
- 14.13 Using Pattern Matching Type Checks Java 15
- 14.14 Using record
- 14.15 Using Sealed classes Java 15
- 14.16 Text Blocks Java 15
- 14.17 Summary
-
15 Concurrency Fundamentals
- 15.1 Fundamentals of Concurrency
- 15.2 Thread
- 15.3 Using Thread sleep
- 15.4 Using join
- 15.5 non-daemon and daemon Thread
- 15.6 Using interrupt
- 15.7 Race Condition
- 15.8 Mutual Exclusion (Mutex)
- 15.9 Using wait and notify
- 15.10 Summary
-
16 Advanced Concurrency
- 16.1 ReentrantLock Basics
- 16.2 Atomic Variables
- 16.3 The volatile keyword
- 16.4 The happens-before Rule
- 16.5 CompletableFuture
- 16.6 Threadpool with Executors
- 16.7 ConcurrentHashMap
- 16.8 ConcurrentSkipListMap
- 16.9 Producer Consumer with BlockingQueue
- 16.10 Summary
-
17 Next Steps
- 17.1 Other important Java features
- 17.2 Practicing Clean Code
- 17.3 Tendencies of the market
- 17.4 Getting prepared for interviews
- 17.5 Strategies to Stay Sharp
- 17.6 Learn more about negotiation
- 17.7 Do you want more?
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