Can we create a clone of a singleton object *?

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.

How many clones can be created for a singleton object?

It will create two instances: one original and another one cloned object.

Can we create object of Singleton class?

You can not make objects of singleton class outside the class because the constructor is private.

Can objects be cloned?

Object cloning refers to the creation of an exact copy of an object. It creates a new instance of the class of the current object and initializes all its fields with exactly the contents of the corresponding fields of this object.

Can we serialize singleton class in Java?

You could do the same thing yourself, by adding custom serialization / deserialization code to your singleton classes. That code would need to either not record the singleton’s state at all, or throw it away when the singleton is deserialized.

Can you destroy a singleton object?

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.

Can we use static class instead of singleton?

– Singleton object stores in Heap but, static object stores in stack. – We can clone the object of Singleton but, we can not clone the static class object. – Singleton can use the Object Oriented feature of polymorphism but static class cannot. Answer: Singleton is just a design pattern and it can be subclassed.

What is Singleton class python?

Singleton is a creational design pattern, which ensures that only one object of its kind exists and provides a single point of access to it for any other code. Singleton has almost the same pros and cons as global variables. You’ll have to carry the Singleton class as well. …

Can we serialize Singleton class in Java?

What is deep copy?

Deep copy is a process in which the copying process occurs recursively. It means first constructing a new collection object and then recursively populating it with copies of the child objects found in the original. In case of deep copy, a copy of object is copied in other object.

What is deep copy in C++?

In Deep copy, an object is created by copying data of all variables and it also allocates similar memory resources with the same value to the object. In order to perform Deep copy, we need to explicitly define the copy constructor and assign dynamic memory as well if required.

Why clone method is protected?

clone is protected because it is something that ought to be overridden so that it is specific to the current class. While it would be possible to create a public clone method that would clone any object at all this would not be as good as a method written specifically for the class that needs it.

Is it necessary to clone a class in singleton class?

It is necessary if your Singleton class extends a class that has a visible clone () method defined in its hierarchy. You can avoid cloning by giving already created object by clone method.

How to create multiple instances of a class using singleton pattern?

A Singleton pattern states that a class can have a single instance and multiple instances are not permitted to be created. For this purpose, we make the constructor of the class a private and return a instance via a static method. But using cloning, we can still create multiple instance of a class.

What is the use of cloning in Java?

Cloning: Cloning is a concept to create duplicate objects. Using clone we can create copy of object. Suppose, we create clone of a singleton object, then it will create a copy that is there are two instances of a singleton class, hence the class is no more singleton. Two different hashCode means there are 2 different objects of singleton class.

Why there are two objects of a singleton class in Java?

As you can see, hashCode of both instances is different, hence there are 2 objects of a singleton class. Thus, the class is no more singleton. Overcome serialization issue:- To overcome this issue, we have to implement method readResolve () method.