Quick Answer: How do I create a deep and shallow copy in Java?

How do you create a deep copy in Java?

The steps for making a deep copy using serialization are:

  1. Ensure that all classes in the object’s graph are serializable.
  2. Create input and output streams.
  3. Use the input and output streams to create object input and object output streams.
  4. Pass the object that you want to copy to the object output stream.

How do you create a shallow copy?

A shallow copy can be made by simply copying the reference. The above code shows shallow copying. data simply refers to the same array as vals. This can lead to unpleasant side effects if the elements of values are changed via some other reference.

What is shallow copy and deep copy explain with example?

A shallow copy constructs a new compound object and then (to the extent possible) inserts references into it to the objects found in the original. A deep copy constructs a new compound object and then, recursively, inserts copies into it of the objects found in the original.

What is shallow copy vs deep copy?

Difference between Shallow and Deep copy of a class

Shallow Copy Deep Copy
Shallow Copy reflects changes made to the new/copied object in the original object. Deep copy doesn’t reflect changes made to the new/copied object in the original object.
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How do you create a deep copy?

If you want to deep copy an object you will have to traverse the object graph and copy each child object explicitly via the object’s copy constructor or a static factory method that in turn deep copies the child object. Immutables (e.g. String s) do not need to be copied.

How do you deep copy an ArrayList?

In Java, to support deep copy, we must override the clone() of model classes. In clone() method, we must ensure that when somebody invokes object. clone() method then it must return a deep copy of that model class (e.g. Employee class).

What is a shallow copy Java?

A shallow copy is a copy of the reference pointer to the object, whereas a deep copy is a copy of the object itself. In Java, objects are kept in the background, what you normally interact with when dealing with the objects is the pointers. The variable names point to the memory space of the object.

What makes a class immutable?

Immutable class in java means that once an object is created, we cannot change its content. In Java, all the wrapper classes (like Integer, Boolean, Byte, Short) and String class is immutable. … Data members in the class must be declared as final so that we can’t change the value of it after object creation.

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