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How do you implement a deep clone?
Deep Cloning We can do it by implementing a Cloneable interface and overriding the clone() method in every reference type we have in our object hierarchy. Then, we call super. clone() and these clone() methods in our object’s clone method.
Which method is used for cloning an object?
An object copy is created by using the clone keyword (which calls the object’s __clone() method if possible). $copy_of_object = clone $object; When an object is cloned, PHP will perform a shallow copy of all of the object’s properties. Any properties that are references to other variables will remain references.
What is deep copy cloning?
Whenever you try to create a copy of an object, in the deep copy all fields of the original objects are copied exactly, in addition to this, if it contains any objects as fields then copy of those is also created (using the clone() method).
Why clone is used in Java?
The clone() copies the values of an object to another. clone() method saves the extra processing task for creating the exact copy of an object. As you can see in the below example, both reference variables have the same value.
Can we override clone method?
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 to do when called for cloning in Java?
So, JVM when called for cloning, do following things: If the class has only primitive data type members then a completely new copy of the object will be created and the reference to the new object copy will be returned.
How is serialization used in deep cloning in Java?
Serialization is another easy way of deep cloning. In this method, you just serialize the object to be cloned and de-serialize it. Obviously, the object which need to be cloned should implement Serializable interface. Before going any further, I should caution that this technique is not to be used lightly.
What’s the difference between shallow copy and clone in Java?
According to you and javadoc Object class clone method provides a shallow copy. Shallow copy is the copy which shares the same memory location. but in case of clone java creates a new object(seperate memory location) and copies all the properties of the actual object to new object. I am really very confused.
Is there a way to clone an object?
Sometimes people use as virtual method called clone () as a helper for polymorphic copying. Finally, note that getting copying and assignment right, if you need to replace the default versions, is actually quite difficult.