03B Java 17 Certification Course
📚 Java 17 Certification Course - Session 03B: Primitives + Strategy Pattern
Java 17 Certification Course (Preparing for version 21)
Code: https://github.com/cursosmrugerio/cur...
We continue with our Java 17 certification preparation course! In this second part of session 03, we finish primitive exercises and explore advanced object-oriented programming concepts.
🎯 *What will we see in this session?*
🔢 *Completion of Primitives Exercises*
**Exercise 22**: Number systems (binary, hexadecimal, octal)
**Exercise 23**: Variable scope and compilation errors
Valid and invalid identifiers
Handling underscores in literal numbers
💡 *Number Systems in Java*
**Binary**: `0b` or `0B` + binary digits
**Hexadecimal**: `0x` or `0X` + hexadecimal digits (0-9, A-F)
**Octal**: Starts with `0` + octal digits
Practical examples and conversions
🎯 *Preparation for Chapter 2*
Operator precedence
Operators Increment/Decrement Operators
Arithmetic and Modulus Operators
Casting Primitives vs. Objects
Relational and Logical Operators
🏗️ *Strategy Pattern (Advanced Design)*
*Complete Step-by-Step Implementation:*
#### 📖 *Fundamental Concepts*
Definition of the Strategy Pattern (also known as Policy)
Advantages over traditional if/else statements
Algorithm selection at runtime
#### 🔧 *Practical Implementation*
**Version 0**: Traditional implementation with inheritance
**Version 1**: Introduction of interfaces and delegation
**Version 2**: Refactoring and simplification
**Version 3**: Constructors with default behaviors
**Version 4**: Final optimized implementation
#### 🦅 *Complete Example: Bird System*
Abstract Class `Bird` with dynamic behavior
Interface `FlyBehavior` as a strategy
Concrete implementations: `IfFly`, `DontFly`, `RandomFly`
Classes `Eagle`, `Duck`, `Penguin` with interchangeable behaviors
🔗 *Key Concepts of the Pattern*
**Has-A vs Is-A**: Composition vs Inheritance
**Delegation**: Transferring responsibilities to other objects
**Polymorphism**: Interfaces as contracts
**Flexibility**: Changing behavior at runtime
⏰ *Timestamps*
00:00 - Exercise 22: Number systems
07:46 - Exercise 23: Scope and compilation errors
12:08 - Chapter 2 preparation
19:54 - Introduction to the Strategy Pattern
26:08 - Traditional implementation (Version 0)
40:08 - Introduction to Interfaces (Version 1)
58:06 - Refactoring and Improvements (Versions 2-4)
1:13:50 - Summary and Applications of the Pattern
💡 *Advanced Concepts Covered*
🎨 *Design Patterns*
✅ Complete Strategy Pattern
✅ Composition vs. Inheritance
✅ Interfaces as Contracts
✅ Delegation of Responsibilities
🔧 *Object-Oriented Programming*
✅ Abstract Classes vs. Interfaces
✅ Has-A Relationship (Composition)
✅ Polymorphism in Action
✅ Flexibility in Design
📚 *Certification Preparation*
✅ Advanced Number Systems
✅ Scope of Variables
✅ Operators and Precedence
✅ Common Compilation Errors
🚀 *Why is this content important?*
📈 *For Certification:*
Complete mastery of primitives and number systems
Deep understanding of scope and variables
Solid preparation for operators
💼 *For the Real World:*
Professional design patterns
Maintainable and flexible code
Object-oriented architecture
🎓 *Additional Resources*
📖 ETW for Java 17 book (chapter 2)
🎥 Supplementary videos on design patterns
💻 Complete code in the course repository
🌐 Reference: refactoring.guru for patterns
🔔 *Did you like the content?*
✅ *Subscribe* for more Java content Advanced
👍 *Like* if this helped you with your certification
💬 *Comment* with your questions about design patterns
📤 *Share* with other Java developers
📝 *Next Session:*
Chapter 2: Operators, Precedence, and Casting - Let's delve deeper!
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🏷️ *Tags:*
#Java #Java17 #Certification #StrategyPattern #ObjectOrientedProgramming #DesignPatterns #Primitives #NumberSystems #Polymorphism #Interfaces #AbstractClasses #Composition #Inheritance #JavaTutorial #OracleJava
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*The Strategy pattern will change the way you program! 🚀*
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