Summary Java in embedded and big data sectors

Java in Embedded and Big Data
Sectors:
Classes and Objects

 Object-oriented programming (OOP) paradigm
 Class: blueprint for creating objects
 Object: instance of a class
Instance Variables

 Variables that belong to an object
 Different objects have different values
Arrays in Java

 Single and multi-dimensional arrays
 Memory allocation
Array Memory Allocation

 Contiguous block of memory
 new keyword

this Keyword and Method Parameters

 this keyword: refers to the current object

 Method parameters: values passed to a method
Java Class and Compilation Process

 .java file: source code

 .class file: compiled bytecode

, Package and Access Modifiers

 Organize classes and interfaces
 Access
modifiers: public , private , protected ,
default
Java Namespaces and Package
Management

 Import statements
Java Hello World Example and Entry Point

 public static void main(String[] args)

Abstract Classes and Abstraction

 Abstract classes
 Interfaces
 Abstraction: hiding implementation details
Final Keyword

 final keyword: restricts modification

 Final variables
 Final methods
 Final classes
Inheritance and Overriding Methods

 Reuse code and create hierarchies
 Overriding methods: changing functionality