# Fork: GodOfJava 2nd Edition
# 자바의신 코드 저장소

• 01 Programming

Class & Method

• A class is the minimum unit of java consisting of state and behavior.
• A method receives the parameter and returns the calculation result.
  

• 02 Hello God Of Java

Building a development Environment

• Compilation of Java File
  
• Printing on the console
  
• Comment
  

public class Sample {
    public static void main(String[] args){
        System.out.println("Printing on the console.");
    }
}

• 03 Object Oriented Programming

Concept of Object

• An object is an instance of a class.
  
• A class consists of variables and methods.
  

public class Calculator {
    public static void main(String[] args) {
        System.out.println("Constructor");
        Calculator myCalculator = new Calculator();
    }
}

• 04 Data Type

Variables of Java

• Java has 4 types of variables and each of them has different range of scope and usability.
  

# === 4 Types of Variables ===
1. Local variables
2. Parameters
3. Instance Variables
4. Class Variables

Data Types

• Primitive Data Type vs Reference Data Type

# === 4 Types of Variables ===
1. Local variables
2. Parameters
3. Instance Variables
4. Class Variables