Day 1:
OOP and Java Basics

JAVA

Introduction and Installation

• JAVA
  • Popular
  • Widely used
  • Fast
• Environments
  • JDK ( jre + java + javac + javadoc )
  • JRE / Java RTE (has jvm)
  • JVM

 

Installation

• Windows
  • from oracle site (MSI install)
    https://www.oracle.com/in/java/technologies/javase/javase-jdk8-downloads.html
  • open JDK
    • Download from https://jdk.java.net/java-se-ri/8-MR3
    • Extract to C:\java\java-se-8u41-ri
    • Set PATH
      • GUI
      • CMD
        • setx -m JAVA_HOME "C:\libs\java-se-8u41-ri"
        • setx -m PATH "%JAVA_HOME%\bin;%PATH%"
• Linux
  • sudo apt install -y update && sudo apt install -y upgrade && sudo apt -y openjdk-8-jdk-headless
    ** "installs JRE id -headless is not used"
    ** path is automatically set

Test

java -version

javac -version

JAVA

Basic Syntax and Flow

Hello Worlding

OOP

• Classes ( prototype of object )
  • Methods ( Operations specific to class )
  • Fields ( Data )
• Objects ( Instances of classes )
  • Autonomous Entities
  • Can be Independent
• Follow:
  • Encapsulation
  • Abstraction
  • Inheritance
  • Polymorphism

OOP

• Classes ( prototype of object )
  • Methods ( Operations specific to class )
  • Fields ( Data )
• Objects ( Instances of classes )
  • Autonomous Entities
  • Can be Independent
• Follow:
  • Encapsulation
  • Abstraction
  • Inheritance
  • Polymorphism

ENCAPSULATION

OOP

• Classes ( prototype of object )
  • Methods ( Operations specific to class )
  • Fields ( Data )
• Objects ( Instances of classes )
  • Autonomous Entities
  • Can be Independent
• Follow:
  • Encapsulation
  • Abstraction
  • Inheritance
  • Polymorphism

Abstraction

OOP

• Classes ( prototype of object )
  • Methods ( Operations specific to class )
  • Fields ( Data )
• Objects ( Instances of classes )
  • Autonomous Entities
  • Can be Independent
• Follow:
  • Encapsulation
  • Abstraction
  • Inheritance
  • Polymorphism

Inheritance

OOP

• Classes ( prototype of object )
  • Methods ( Operations specific to class )
  • Fields ( Data )
• Objects ( Instances of classes )
  • Autonomous Entities
  • Can be Independent
• Follow:
  • Encapsulation
  • Abstraction
  • Inheritance
  • Polymorphism

PolyMorphism

OOP

Overloading vs Overriding

Overriding in a nutshell

OOP