CODEWITHSUNDEEP
javaoopvariablesstatic
Pablo Hernandez
Pablo Hernandez

Reputation: 11

How to initialize object from a different class and maintain state

I'm quite new on Java and I need some help please.

The thing is I have a main class with a null variable object on it (required to be null at start) and a menu with different options to change this variable status.

Each option is controlled by a different class which changes the status of this variable.

How could I initialize this variable from the #1 option class and maintain the status of this variable through options without declaring this variable static?

Executing menu option #2 requires variable to be initialized.

The menu is not on the same "main" class because I'm trying to make it reusable using heritage and polymorphism for it.

Class Problem { //main class
    private Control control;
}

Class Option1{
    //initialize the variable control = new Control();
}

Thanks a lot!

Upvotes: 0

Views: 703

Answers (2)

Timothy Truckle
Timothy Truckle

Reputation: 15624

The menu is not on the same "main" class because i'm traying to make it reusable using heritage and polimorfism for it.

Please keep in mind that inheritance is not a good way to "reuse code". Inheritance must qualify for an is a relationship. Reuse of code is better accomplished by composition.

Upvotes: 1

ja08prat
ja08prat

Reputation: 154

The best advice I could give is to make it part of the constructor in the other classes (every class except the one where you initialize it to null) and pass it every time you use the "menu"

Upvotes: 0

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