Best answer: What is deep copy of a Java object?

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).

What is a deep copy Java?

The deep copy of an object will have an exact copy of all the fields of source object like a shallow copy, but unlike sallow copy if the source object has any reference to object as fields, then a replica of the object is created by calling clone method.

What is meant by 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.

How do you make 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.
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Does Java make deep copy of object?

Introduction. When we want to copy an object in Java, there are two possibilities that we need to consider, a shallow copy and a deep copy. … In the deep copy approach, we make sure that all the objects in the tree are deeply copied, so the copy isn’t dependant on any earlier existing object that might ever change.

How do you create a deep copy of an object?

# 3 Ways to Clone Objects in JavaScript

  1. Objects are Reference Types.
  2. Using Spread.
  3. Using Object.assign.
  4. Using JSON. Lodash DeepClone vs JSON.
  5. Shallow Clone vs Deep Clone. Shallow Copy. Deep Copy.
  6. Performance.
  7. Object.assign vs Spread. Deep Clone using External Libraries. More Ways using JavaScript.

What is shallow copy and deep copy Java?

In shallow copy, only fields of primitive data type are copied while the objects references are not copied. Deep copy involves the copy of primitive data type as well as object references.

What does each object have its own copy of?

An object contains data (instance variables) representing its state, and instance methods, which are the things it can do. Each object has its own copies of the instance variables. A class may also contain its own data (class variables) and class methods. The keyword static denotes such data and methods.

Which tool is used to create a copy of object?

There are several ways to copy an object, most commonly by a copy constructor or cloning. Copying is done mostly so the copy can be modified or moved, or the current value preserved.

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Why do we need deep copy?

Deep copy stores copies of the object’s value. 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. … Deep copy stores the copy of the original object and recursively copies the objects as well.

What is the difference between shallow copy and deep copy in java?

Shallow Copy Vs Deep Copy In Java :

Shallow Copy Deep Copy
Shallow copy is preferred if an object has only primitive fields. Deep copy is preferred if an object has references to other objects as fields.
Shallow copy is fast and also less expensive. Deep copy is slow and very expensive.

Why is string immutable in java?

String is Immutable in Java because String objects are cached in String pool. Since cached String literals are shared between multiple clients there is always a risk, where one client’s action would affect all another client.

How do you clone an ArrayList?

Create a list to be cloned. Clone the list by passing the original list as the parameter of the copy constructor of ArrayList.


  1. Create a cloneable class, which has the clone method overridden.
  2. Create a list of the class objects from an array using the asList method.
  3. Create an empty list.
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