Is there a way to declare a private object from another file?

Question

Okay, I really cannot find a good way to put this into words. Is there a way to declare all things in a public class, but privately and in another file/class without knowing what all the objects are ? Here's an example.

SetOfThings.java

public class SetOfThings {
   // For the sake of the question, say these can change
   // from time to time
   public int someNumber = 1;
   public string someString = "Java is kinda challenging sometimes...";
   public Joystick example = new Joystick(someNumber);
}

SomeOtherFile.java

public class SomeOtherFile {
   /** Some way to recreate all the public objects from 
    * SetOfThings with the same values, but private 
    * (perhaps final, too?) and without having to 
    * know what all the objects in SetOfThings are.
    */
}

I've already searched around, but as I said, I can't figure out how to word it without being overly specific. Currently, I'd have to edit each and every file to update the things I'm calling that are used separately.

Answer 1

What you could do is in your constructor of SomeOtherFile.java to add a private variable SetOfThings things; your code could look something like this

SetOfThings.java

    public class SetOfThings {
   // For the sake of the question, say these can change
   // from time to time
   public int someNumber = 1;
   public string someString = "Java is kinda challenging sometimes...";
   public Joystick example = new Joystick(someNumber);
}

SomeOtherFile.java

    public class SomeOtherFile {
           private SetOfThings setOfThings; //this is so you can access all the SetOfThings variables
           public SomeOtherFile(SetOfThings things){
                this.setOfThings=things //attribute things to the private variable
           }
    }

like this you have access to your SetOfThings.java in your SomeOtherFile.java . If your values don't change you also have the option to simply declare a SetOfThing object in your SomeOtherFile

SetOfThing myObjectInOtherClass=new SetOfThing();