Composite design pattern

Constructors in Java

The Stack and The Heap in the Java

Interface in Java

Why Multiple inheritance is not allowed in Java (Deathly Diamond of Death)

Polymorphic reference variables and Casting objects in Java

"Object" class in Java

Abstract Class and Abstract Method in Java

Polymorphism in Java

IS-A relationship and rules for using Inheritance in Java

Inheritance in Java

Encapsulation in Java And "==" comparison on primitive variables

Java Method Parameters and Arguments

Methods use instance variables (How state affects the behavior and how behavior affects the state)

Java Array Variables

Java Reference Variables

Java Primitive Variables

Java Classes and Objects

Introduction to Java (Why Java is a platform independent language)

Facade design pattern

Adapter design pattern

Template method design pattern

Composite design pattern

Iterator Design Pattern

Decorator Design Pattern