App.java

package com.company;

/*
    ? Package
    A package in Java is used to group related classes.
    Think of it as a folder in a file directory.
*/

/*
    ? Class
    A class is a template for objects.
    It is a collection of variables and methods.
    A class is a blueprint from which individual objects are created.
*/

/*
    ? Naming Conventions:
    * Class Names - PascalCase
    * Method/Function Names - camelCase
*/

/*
    ? Anatomy of a Java Program
    * Documentation Section
    * Package Statement
    * Import Statements
    * Interface Statements
    * Class Definitions
    * Main Method Class
    * {
    *   Main Method Definition
    * }
*/

/*
 ? Data Types
    * Primitive Data Types
        * Integer Types
            * byte  (1 byte)
            * short (2 bytes)
            * int   (4 bytes)
            * long  (8 bytes)
        * Floating Point Types
            * float     (4 bytes)
            * double    (8 bytes)
        * Character Type
            * char  (2 bytes)
        * Boolean Type
            * boolean   (1 byte, but 1 bit is used)
    * Non-Primitive Data Types
        * String
        * Arrays
        * Classes
        * Interfaces
        * Enumerations
        * Annotations
        * Lambda Expressions
 */

public class App {
    public static void main(String[] args) { // main() method is the entry point of the program
        System.out.println("Hello, World!");
    }
}