question regarding OOP

[silver plank]

hi i have a small question regarding OOP.

[charred karma]

<@&987246399047479336> please have a look, thanks.

[silver plank]

in this question how could i make it have id, name , and dose for each drug ?

[thin fiber]

I think you can have a drug class

that has the fields for id name dosage (min or max)

and then in your prescription class you can have a drug array as a field

so something like this

public class Drug{
  
  public int ID; 
  public string Name;
  public string dosage;


//implement the constructor and getters and setters for it 

}

//now the prescription class

public class Prescription{
    public int ID
    public string doctorname;
    public string specialty;
    public Drug drugs[];

//implement the constructor(make sure limit to the drug array is 10) and getters and setters for it 


}

[charred karma]

Detected code, here are some useful tools:

Formatted code

public class Drug {
  public int ID;
  public string Name;
  public string dosage;
  //implement the constructor and getters and setters for it 
}
//now the prescription class
public class Prescription {
  public int IDpublic string doctorname;
  public string specialty;
  public Drug drugs[] ;
  //implement the constructor(make sure limit to the drug array is 10) and getters and setters for it 
}

[thin fiber]

hope it helps @silver plank

[versed canyon]

Though it's String not string in Java, the declaration of the array of drugs should be Drug[] drugs, the names of fields should start with a lower-case letter, and we would usually make the fields private and only expose them through getters and setters.

eg

   private String name;

   ...

   public String name() {
       return name();
   }

   public void setName(String name) {
       this.name = name;
   }

Since they don't want any methods, we're obviously doing it less idiomatically (for Java)

[thin fiber]

ahh got it, sorry bro still new to coding as a whole but makes sense tysm!

[silver plank]

Ok thanks for both.

I have one last question

What is the reason that the make me do a default constructer then make a copy one ?

[brave storm]

that should be in your assigment, every constructor gives another way of initialzing the object. Also the higher code is an example so do not copy paste it. Your doing an asiment on OOP and there are OOP problems in the pasted code

a prescription is made by a Doctor, so all the info regarding the Doctor does NOT come from strings 😉

@silver plank

[silver plank]

Ok i see

I wanna send my code but it says its too long.

[thin fiber]

send the file bro

[charred karma]

I uploaded your attachments as Gist.

[brave storm]

first thing to notice -> user proper capital letters. Methods have camelCasing and classes start with a capital letter

and try to keep your class names logical. Info on a doktor usually just goes into Doktor

[half narwhal]

I'd split up your classes a bit. It's also a bit strange to see PatientInfo in a Prescription package. A Prescription can have a PatientID.

[brave storm]

has 😉

[half narwhal]

Hmm?

[brave storm]

https://i.imgur.com/YyF6j6H.png

in this case its has a patientId, not can have

[half narwhal]

Sorry, I should have phrased it better. I was talking about his package structure.

Also pay attention to your spelling:

public pationtInfo(){

}
public pationtInfo(String name,int age , int id){
    this.name=name;
    this.age=age;
    this.id=id;
}

public String getose (){
    return dose;
} 
public int GETID (){
    return id;
}   

[brave storm]

also the assigment says no methods, only design. So good info for the future

[silver plank]

ok ok i will redo it.

[silver plank]

Idk if this is enough.

[charred karma]

I uploaded your attachments as Gist.

[brave storm]

@lag might i suggest u actually read the text u pasted on the assignment

esp the 1st item

[silver plank]

without the methods

[brave storm]

yes

not really what your doing, all u need is a class diagram, not actual code

[silver plank]

public class PatientInfo {
    private String patientName;
    private int patientID;
    private int patientAge;
}

public class Drug {
    private String name;
    private int id;
    private String dose;
}

public class DoctorInfo {
    private String name;
    private String specialty;
    private int license;
}

public class Prescription {
    public static void main(String[] args) {

    }
}

[charred karma]

Detected code, here are some useful tools:

Formatted code

public class PatientInfo {
  private String patientName;
  private int patientID;
  private int patientAge;
}
public class Drug {
  private String name;
  private int id;
  private String dose;
}
public class DoctorInfo {
  private String name;
  private String specialty;
  private int license;
}
public class Prescription {
  public static void main(String[] args) {
  }
}

[silver plank]

is this fine ?

[brave storm]

no, u lack items. Also remember your lessens that oop gets translated to real life objects. What is a 'PatientInfo'? Wouldnt it be more logical to just use Patient ?

[half narwhal]

You're missing your actual prescription record.

[brave storm]

And if u seen actuall oop with extended classes, u lack something huge 😉

[silver plank]

i am having hard time understanding OOP.

[thin fiber]

ur pretty much creating blueprints of real world entities to simulate the real world bro

its as simple as that

[silver plank]

package prescription;



public class DoctorInfo {
    private String name;
    private String specialty;
    private int license;
}

public class Drug {
    private String name;
    private int id;
    private String dose;
}


public class Patient {
    private String patientName;
    private int patientID;
    private int patientAge;
    private Drug[] drugs;
    
}```

[brave storm]

do not panic, your on the good way. However your guessing at this point. Grab your assigment next to u and have a look 😉

U need a prescription, a doctor and a patient, and a drug

doctor and patient have things in common, so ( unless u havent seen extended / parent-child ) so there u might want to consider having a parent class

a prescription has a patient and a doctor and it may contain up to 10 drug(s) and it has a date

[silver plank]

the date could i make it as static int?

[brave storm]

no

if u make it static, each change u make will go on every single prescription

lets start at the beginning, have u seen classes with extend or parent / child relations ?

[silver plank]

no

[brave storm]

have u seen anything like

class Car extends Vehicle;
class Airplane extends Vehicle;

something like that ?

[silver plank]

no

[brave storm]

right then u dont need to worry on a superclass

[silver plank]

this is the whole question

[brave storm]

i know your not going to like this but see the last line ?

[silver plank]

yeah

[brave storm]

u made the assumption u needed code

u need a class diagram in UML

[silver plank]

ik but i think after i write the code i do the a uml for it

for my code

[brave storm]

other way around

first u design, then u code

for example ( based on your drug above )

https://i.imgur.com/Wdk6eZA.png

don't waste time coding it first when u just need a simple schematic. There is software to desinging those ( starUml / plantUml )

[silver plank]

wait what is Long

[brave storm]

a bigger number then int

int only goes from -2147483648 to 2147483647 so for an id that's kinda limited

[raw belfry]

There are 6 primitive number types in Java. byte 2^8 short 2^16 int 2^32 long 2^64 and there are also floating point types like float and double

Long in uppercase, like in the image you shared is a wrapper class of long

Basically the same long just with additional methods and which can be used in generic context when u come so far

[silver plank]

thx

how much practice do u think it will take to become a pro. can anyone share how he started.

[raw belfry]

To become very advanced in core Java, its based on how much time you spend per day and the quality. If you spend everyday 8 hours coding (mostly projects instead of thousends Leedcode DSA problems) you will take about ~3 months.

[silver plank]

ONLY 2 months ?

3*

[raw belfry]

dont forget 8 hours per day

And its just core Java

[silver plank]

yeah ik

[raw belfry]

If you want to build things like backend application you will also need to learn a lot of frameworks and librarys

basically you can never master Java fully, you will always be learning

And keep in mind very advanced in core Java doesnt mean that you know every standard library. Thats impossible, but you will know everything to implement pretty much anything you want as long as it not need external libraries

[silver plank]

ok thank you ill try my best

[half narwhal]

You always keep learning new things, core java continuously evolves. Good luck!

[brave storm]

i started back in the days when Basic was still new. Actual basic, not visual basic. And do not focus on mastering the language. Focus on how to break down the assigment u need to do , so u can get it to work. Code evolves and reinvents itself every x days. Imposssible to learn and master it all. Its like the english saying Jack of all trades, Master of none