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Learning the fundamentals of JAVA

Java compilation

Byte Code > Java Virtual Machine > Native Code

Java Editions

1. Standard Edition
2. Enterprise Edition
3. Micro Edition
4. Java Card

Two types of data

1. Primitive Types

   • Numbers: Byte, short, int, long, float, double
   • Char
   • Boolean

2. Reference Types (Non-primitive)

   • Their values are usually their location in memory, that's why it's called "reference type"
   • Array
   • Object
   • String

Method overloading

Method that are implemented multiple times

Expression

Piece of code that produces a value

Compound assignment operator

- Augmented assignment operator
- E.g: +=, -=, >= ... 

Two types of Casting

 1. Implicit Casting
    - Automatic Conversion
    - E.g: byte > short > int > long > float > double

2. Explicit Casting
    - Manual Conversion or Forced Conversion
    - E.g: (int) 1.1;

Factory Method

Creates objects without specifying the exact class that will be instantiated.

Packaging Java

jar = Java Archive

1. File > Project Structure > Artifacts > JAR > modules with dependencies.
2. Build > Build artifacts
3. open file in terminal
4. Run this command:

java -jar NameOfJarFile.jar