Java OOP: Understanding Inheritance & Polymorphism in Java

Course: 1 Hour, 22 Minutes

• Course Overview
• Introduction to Inheritance
• Inheritance in Action
• Understanding Polymorphism
• The java.lang.Object Base Class
• Methods Derived from java.lang.Object
• Member Variables in Derived Classes
• Introducing the Is-A Relationship
• Relationships between Base and Derived Class Objects
• Multiple Derived Classes from One Base Class
• Course Summary

Java OOP: The Role of Constructors in Inheritance

Course: 58 Minutes

• Course Overview
• Access Modifiers and Superclass Constructors
• Introduction to Constructors
• Using the super Keyword
• Default and Parameterized Constructors
• Invoking Base Class Constructors
• Initializing Member Variables
• Course Summary

Java OOP: Multi-level Inheritance

Course: 57 Minutes

• Course Overview
• Introduction to Multilevel Inheritance
• The instanceof Operator
• The Is-A Relationship
• Downcasting
• Up-casting
• Multilevel Inheritance Hierarchies
• The extends Keyword
• Course Summary

Java OOP: Run-time & Compile-time Polymorphism

Course: 1 Hour, 21 Minutes

• Course Overview
• Introduction to Polymorphism
• Method Overriding
• The @Override Annotation
• Polymorphism in a Multilevel Inheritance Hierarchy
• Adding Classes to Inheritance Hierarchies
• Introduction to Compile-time Polymorphism
• Understanding Type Promotion
• Forbidden Type Conversions
• Compile-time Polymorphism & Inheritance Hierarchies
• Course Summary

Java OOP: Understanding Overriding & Hiding in Inheritance

Course: 1 Hour, 23 Minutes

• Course Overview
• Method Overriding and Hiding
• Method Invocation and the super Keyword
• Overriding Base Class Methods
• Method Overriding with Inheritance Hierarchies
• Static Methods and Static Binding
• Pitfalls to Avoid with Static Methods
• Overriding toString Correctly
• Overriding equals Correctly
• Overriding hashCode Correctly
• The Link between equals and hashCode
• Course Summary

Java OOP: The Semantics of the final & abstract Keywords

Course: 1 Hour, 1 Minute

• Course Overview
• Introducing the final Keyword
• Final Member Variables
• Final Arrays
• Final Classes and Final Methods
• Defining Abstract Classes
• Extending Abstract Classes
• Instantiating Derived Class Objects of Abstract Classes
• Course Summary

Java OOP: Access Modifiers for Regulating Access

Course: 55 Minutes

• Course Overview
• Access Modifiers
• Cross-package Access
• The Semantics of Protected Members
• Cross-package Access of Protected Members
• The Default Access Modifier for Members
• The Default Access Modifier for Classes
• Course Summary

Java OOP: Interfaces & Anonymous Classes

Course: 1 Hour, 9 Minutes

• Course Overview
• Introduction to Interfaces
• Using instanceof with Interfaces
• Combining the extends and implements Keywords
• Multiple Inheritance of Interfaces
• Default Methods in Interfaces
• Abstract Classes that Implement Interfaces
• Anonymous Inner Classes
• Outer Class Access from Anonymous Inner Classes
• Course Summary

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