How do I access private or public variables in another class through 1 class

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Hellow all i first asked a question here
Requesting help regarding proper coding designs[^]

maybe i am just a fool but i could not catch up with what they had mentioned there all though i did some research and came into a conclusion where i think that a static variable is something that we assign to a variable when that is common to all the objects . However i am still stuck with how i should access variables that are in one class from another .(also pls correct me if my idea on static variables is wrong)This is a code that i just came up with to make the question more easier to understand

package testing1;

import java.util.Scanner;

class HerDetails {

    public String her_Name = null;
    public int her_age = 0;
    public String her_eye_colour = null;
    private String her_Hair_Colour = null;


    public void getHerDetails() {
        Scanner sc = new Scanner(System.in);
        System.out.println("Enter Her name");
        her_Name = sc.next();
        System.out.println("Enter her age");
        her_age = sc.nextInt();
        System.out.println("Enter her eye colour");
        her_eye_colour = sc.next();
        System.out.println("Enter her hair colour");
        her_Hair_Colour = sc.next();


    }

    public void herDetails() {

        System.out.print(her_Name);
        System.out.println(her_age);
        System.out.println(her_eye_colour);


    }
}

class  HisDetails{

        public String his_Name=null;
        private int his_Age;
        private String his_eye_colour;



        public void getHisDetails(){
        Scanner sc1=new Scanner(System.in);
            System.out.println("Enter His name");
            his_Name= sc1.next();
            System.out.println("Enter His Age");
            his_Age=sc1.nextInt();
            System.out.println("Enter his eye colour");
            his_eye_colour= sc1.next();



        }
        public void displayHisDetails(){
            System.out.println(his_Name);
            System.out.println(his_Age);
            System.out.println(his_eye_colour);

        }



}




public class Main {

    public static void main(String[] args) {

         HerDetails h1=new HerDetails();
         HisDetails h2=new HisDetails();
        h1.getHerDetails();
        h2.getHisDetails();
        h1.herDetails();
         h2.displayHisDetails();

    }
}

so how do i go about doing this imagine i wanted to create a class called "theirdetails" where i am going to insert data like

int theDayTheyMet

and

int ageDifference

or String

theirNamesTogether

which i think would make sense to you hopefully . So inorder to go about this i clearly need to use the ages of the two people to find the difference from the other two classes and their names to get their names together . How do i get those values entered from the first class to another class ? i want to know the correct way?

What I have tried:

Im not sure iv read alot but not had any luck i know that setters and getters work , but is that what i should use remains a doubt ? meaning i still dont know my basics.? please enlighten me

Posted 11-Apr-18 11:36am

Member 13771743

Updated 11-Apr-18 21:17pm

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Maciej Los · Answer 1 · 2018-04-11T21:18:00

Java is OOP[^] language and therefore you can use inheritance, polymorphism[^], etc.
An example from above link:

Java

class Teacher {
   String designation = "Teacher";
   String collegeName = "Beginnersbook";
   void does(){
	System.out.println("Teaching");
   }
}

public class PhysicsTeacher extends Teacher{
   String mainSubject = "Physics";
   public static void main(String args[]){
	PhysicsTeacher obj = new PhysicsTeacher();
	System.out.println(obj.collegeName);
	System.out.println(obj.designation);
	System.out.println(obj.mainSubject);
	obj.does();
   }
}

On the same manner, you can extend Person class by creating Man and Woman classes which derived from Person.

As to this statement:

Quote:
i wanted to create a class called "theirdetails" where i am going to insert data like
int theDayTheyMet
and
int ageDifference
or String
theirNamesTogether

You can always create a Couple or Pair class which may hold 2 public members: Man and Woman.

Java

class Couple {
    private Man his = new Man(...);
    private Woman her = new Woman(...);

    //another members, methods here
    
}

Because Man and Woman base class is Person, you can simplify your Couple class to:

Java

class Couple {
    private List<Person> persons = new ArrayList<Person>();

    //another members, methods here
}

A List[^] and an ArrayList[^] provide several methods to add/iterate/remove elements.

[EDIT]
I'd store date[^] of birth instead of age. You can calculate age this way: year_of_current_date - year_of_birth.
See:
Calculate Age from date of birth in Java - Memorynotfound[^]
date - How do I calculate someone's age in Java?[^]