Quick Answer: Why clone method is protected in Java?

Why do we need to override clone method?

When we override the clone() method inside the Programmer class, we need to explicitly take care of this List, otherwise, both original and cloned objects will point to the same Collection in the Java heap, which means, any change e.g. adding a new Certification in the original object will also reflect in a cloned …

Why is Java clone 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.

Why is object clone () method available only to classes that implement cloneable interface?

Cloneable just acts as a marker interface. @Don_Quijote it means that you can override it in your class if you want but it can’t be accessed directly since it’s not public .

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What is the purpose of protected object clone () throws CloneNotSupportedException?

If we do not implement Cloneable interface, clone() method generates CloneNotSupportedException. The clone() method saves the extra processing task for creating the exact copy of an object. If we perform it by using the new keyword, it will take a lot of processing to be performed, so we can use object cloning.

Is it compulsory to override clone method?

No you are not forced to override the clone method. In inheritance, when you inherit a class, you are not forced to override it’s method.

Can we override clone method in Java?

Every language which supports cloning of objects has its own rules and so does java. In java, if a class needs to support cloning it has to do following things: You must implement Cloneable interface. You must override clone() method from Object class.

What does clone do in Java?

Clone() method in Java. 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.

Why clone method is not visible?

Object class is in java. lang package and MyClass is in GoodQuestions package. So clone() method becomes a private member of MyClass class. That explains why you are unable to access clone() method from TestSingleTon class.

Why clone method is not in cloneable interface?

clone method produces an instance of whatever class it is called on; this cannot be reproduced without native code. This is why the Object. clone method could not have been avoided. Cloneable could have contained a clone method, but it would create issues regarding the throws clause.

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Why do we need to implement cloneable interface?

Cloneable interface is implemented by a class to make Object. clone() method valid thereby making field-for-field copy. This interface allows the implementing class to have its objects to be cloned instead of using a new operator.

Why do we use super in Java?

The super keyword in Java is a reference variable which is used to refer immediate parent class object. Whenever you create the instance of subclass, an instance of parent class is created implicitly which is referred by super reference variable. … super can be used to invoke immediate parent class method.

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