If you want to learn the critical fundamental concepts in Java then consider this course carefully. This course is a systematic approach to the Oracle Java 8 1Z0-808 (OCA) Certification exam. All of the topics on the syllabus on the Oracles website are covered. All of the topics are dealt with in detail, assuming no prior knowledge.
Topics include:
Java Basics
Working with Java Data Types
Controlling Program Flow
Working with Methods and Encapsulation
Java Object-Oriented Approach
Exception Handling
Arrays
Working with Selected classes from the Java API
As well as explaining concepts using code samples in an IDE where necessary, I draw diagrams on a whiteboard wherever I can. Feedback from learners has been extremely positive regarding the use of diagrams on the whiteboard. The whiteboard is particularly useful around the topics of:
Java objects versus references
String and wrapper-class immutability
Arrays
Inheritance - upcasting, downcasting, ClassCastExceptions (why they occur)
Garbage collection
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