You asked: How many ways we can break singleton class in Java?

How many ways we can create singleton class in Java?

There are several ways to use the singleton design pattern. Check out this post on how to use the singleton design pattern through four different methods. We have various ways of creating singletons in Java.

How do you destroy a singleton object in Java?

If you really need to reset a singleton instance (which doesn’t makes much sense actually) you could wrap all its inner members in a private object, and reinitialize via an explicit initialize() and reset() methods. That way, you can preserve your singleton istance and provide some kind of “reset” functionality.

How do I override Singleton class?

The only way to override a singleton is to have a singleton that expects to be overridden. The simplest way to do this is to provide Singleton that implements an interface (or is otherwise fully abstract itself) that internally instantiates an injected singleton upon the first use of getInstance() .

Can singleton class be cloned?

When writing a class using the Singleton pattern, only one instance of that class can exist at a time. As a result, the class must not be allowed to make a clone.

Can we break immutable class in Java?

More detailed answer: Yes serialization can break immutability. It looks great. It’s immutable (you can’t change start and end after initialization), elegant, small, threadsafe etc. You have to remember that serialization is another way of creating objects (and it is not using constructors).

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Can we make constructor final?

No, a constructor can’t be made final. A final method cannot be overridden by any subclasses. As mentioned previously, the final modifier prevents a method from being modified in a subclass. … In other words, constructors cannot be inherited in Java therefore, there is no need to write final before constructors.

Can constructor be private?

Yes. Class can have private constructor. Even abstract class can have private constructor. By making constructor private, we prevent the class from being instantiated as well as subclassing of that class.

Can singleton class be serialized?

Serialization:- Serialization can also cause breakage of singleton property of singleton classes. … Suppose you serialize an object of a singleton class. Then if you de-serialize that object it will create a new instance and hence break the singleton pattern.

How do you destroy a singleton?

Longer answer: You cannot destroy a singleton, except you use a special Classloader. If you need to destroy it, you shouldn’t use a singleton at all. Maybe you can rewrite it in a way to reopen it – better: avoid the singleton pattern.

How do I delete an object in singleton?

And deletion of singleton class object would be allow only when the count is zero. To design C++ delete singleton instance, first, we need to make the singleton class destructor private, so, it can not be accessed from outside of the class. Hence, user cannot delete the singleton instance using the keyword “delete”.