Java Object-Oriented Programming

Learn how to use the object-oriented programming model to write code that's secure, scalable, and easier to troubleshoot.

Introduction

• Why learn about object-oriented programming in Java
• What is object orientation?

1. Classes and Objects in Java

• Using classes as blueprints
• Building objects with a constructor
• Using concrete instances for application logic
• Understanding the difference between class and instance members
• Exploring a built-in Java class
• Challenge: Build an employee class
• Solution: Build an employee class

2. Encapsulation in Java

• What is encapsulation?
• Discovering access modifiers
• Implementing encapsulation with access modifiers
• Exploring encapsulation in Java string class
• Challenge: Banking application
• Solution: Banking application

3. Inheritance in Java

• What is inheritance?
• Leveraging different types of inheritance
• Using inheritance to reduce code duplication
• Discovering inheritance in foundational Java classes
• Challenge: Reduce redundant code with inheritance
• Solution: Reduce redundant code with inheritance

4. Polymorphism in Java

• What is polymorphism?
• Writing reusable algorithms with runtime polymorphism
• Exploring different forms in a single object
• Accessing specific object forms with instanceof
• Writing flexible code with compile-time polymorphism
• Exploring how built-in Java classes use polymorphism
• Challenge: Reduce complexity with polymorphism
• Solution: Reduce complexity with polymorphism

5. Abstraction in Java

• What is abstraction?
• Using abstract classes in Java to reduce code complexity
• Using interfaces in Java to provide conformity
• Discovering abstraction in Java source code
• Challenge: Leverage abstraction to write simpler applications
• Solution: Leverage abstraction to write simpler applications

Conclusion

• Identifying code smells and anti-patterns in OOP code
• Next steps