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Java Class Initialization Order


Java Class Initialization Order

By : Daniel
Date : November 17 2020, 11:58 AM
like below fixes the issue The parent class (GameState) gets fully initialized before the child class (GameStateMenu). That means that the GameState constructor gets called before any initialization takes place in GameStateMenu, so at that point buttonPadding still has the default value for an unassigned int, which is zero. After GameState gets fully initialized, GameStateMenu gets initialized - first buttonPadding gets set to zero, then the constructor gets called.
Unsolicited Advice: It's usually a Bad Idea for a parent class constructor to call methods defined in child classes. It allows child classes to break invariants in the parent. In this particular case, it looks like you might want an interface instead of an abstract class, but it's hard to say without knowing more about your code.
code :


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Textual order of static variables and initialization order in Java

Textual order of static variables and initialization order in Java


By : Sahand
Date : March 29 2020, 07:55 AM
it fixes the issue I only spend five minutes to find a duplicate in SO. ,
In java can I be sure that a1 is always initialized before a2 ?
Order of class initialization during java deserialization

Order of class initialization during java deserialization


By : serge lesnichy
Date : March 29 2020, 07:55 AM
I wish this help you I am not an expert on BNF, but the protocol spec for serialization
code :
classDescInfo:
  classDescFlags fields classAnnotation superClassDesc 
java: initialization of static fields of the same class during class initialization

java: initialization of static fields of the same class during class initialization


By : charanjeet chhabra
Date : March 29 2020, 07:55 AM
wish help you to fix your issue You can verify what's happening by putting field breakpoints on the two static fields.
I've modified your sample a bit:
code :
class TariffModelManager {
    private static final TariffModelManager tariffModelManager = TariffModelManager.getInstance();
    private static volatile TariffModelManager _instance = new TariffModelManager();

    private TariffModelManager() {
        System.out.println("From Constructor: " + this);
    }

    public static TariffModelManager getInstance() {
        if (_instance == null) {
            synchronized (TariffModelManager.class) {
                if (_instance == null) {
                    _instance = new TariffModelManager();
                    System.out.println("Creating new instance: " + _instance);
                }
            }
        }
        return _instance;
    }

    public static void main(String[] args) {
        TariffModelManager.getInstance();

        System.out.println("tariffModelManager: " + TariffModelManager.tariffModelManager);
        System.out.println("_instance: " + TariffModelManager._instance);
    }
}
From Constructor: TariffModelManager@ea4a92b
Creating new instance: TariffModelManager@ea4a92b
From Constructor: TariffModelManager@3c5a99da
tariffModelManager: TariffModelManager@ea4a92b
_instance: TariffModelManager@3c5a99da
class TariffModelManager {
    private static final TariffModelManager tariffModelManager = _instance;
    private static volatile TariffModelManager _instance = new TariffModelManager();

    private TariffModelManager() {
        System.out.println("From Constructor: " + this);
    }

    public static TariffModelManager getInstance() {
       return _instance;
    }
}
class TariffModelManager {
    private static final TariffModelManager tariffModelManager = getInstance();
    private static volatile TariffModelManager _instance = new TariffModelManager();

    private TariffModelManager() {
        System.out.println("From Constructor: " + this);
    }

    public static TariffModelManager getInstance() {
       return _instance;
    }
}
Order of In Class Initialization versus Constructor Initialization List

Order of In Class Initialization versus Constructor Initialization List


By : Flag Milliken
Date : March 29 2020, 07:55 AM
Does that help This is guaranteed by the standard that non-static data members will be initialized in the order of their declarations in the class definition. How they're initialized (via default member initializer or member initializer list) and the order of these initializers don't matter.
[class.base.init]#13.3
Order of initialization/instantiation of class variables of derived class and invoking of base class constructor

Order of initialization/instantiation of class variables of derived class and invoking of base class constructor


By : Bilal Atlı
Date : March 29 2020, 07:55 AM
will help you The order of execution occurs in the following manner:
1) Static initializers
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