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Shallow and Deep Copy in Java

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Question 1:

Do we need to override the clone method if we implement the Cloneable interface, if there is no specific functionality defined.

If we have to override , what is the benefit of such override.

Question 2:

The below code is from other site (Source:http://javaconceptoftheday.com/difference-between-shallow-copy-vs-deep-copy-in-java/) ,

In the deep copy example

In the deep copy example the clone method definition is modified , even if we don’t override it and have another course object, add it to the student object and use the set method for changing the field , its going to behave the same.

What is the benefit of such override?

Example similar to the above:

Course course=new Course(“subj1″,”subj2”,"subj3");
Student std=new Student(123,“student1”,course);
Student std2=(Student ) std.clone();
Course course2=new Course(“subj1″,”subj2”,"subj3");

is this definition and the overrided clone method definition are the same?
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