fdg

import java.util.Date;

import java.awt.*;

public class App {
    public static void main(String[] args) throws Exception {
        /*
        Two categories of types:
        Primitive for storing simple values (Numbers, Characters and Booleans)
        Non-primitive or reference for storing complex objects (Date and mail messages)
         */

        // Primitive
        //byte byteExample = 4; //don't worry about this too much, you can just use int
        //short myNumber = 55 //use int
        //int age = 55;
        //int superLongNumber = 443_44;
        //long veryLongNumber = 3_123_456_789L; //Don't forget to use, L

        float myFloat = 5.4F; //6 decimal digits F
        double myDouble = 85.588888835D; //15 decimal digits D
        //char letter = 'F';
        //boolean myBool = false;
        System.out.println(myDouble);
        System.out.println(myFloat);

        //Non-primitive/Reference

        //Allocate the memory (this is necessary for non-prim/ref types)
        Date now = new Date(); //this variable "now", also an object, is an INSTANCE of the Date() class.
        //This class is a defined template or blueprint for creating new objects or instance.
        //For example, we can create a class called human.
        //Objects are INSTANCES of a class.
        System.out.println(now); //System/out is a class, therefore we can use the dot operator


        //Primitives and references 2
        int firstNo = 1;
        int secondNo = firstNo;
        firstNo = 5;
        System.out.println(secondNo);
        //this will print out 1, despite assigning firstNo to secondNo. Primitives are independent from each other

        Point point1 = new Point(1, 1);
    }
}