Java By Source

This is my third article on Java Cloning  series, In previous articles Java Cloning and Types of Cloning (Shallow and Deep) in Details with Example  and Java Cloning - Copy Constructor versus Cloning  I had discussed Java cloning in detail and explained every concept like what is cloning, how does it work, what are the necessary steps we need to follow to implement cloning, how to use Object.clone(), what is Shallow and Deep cloning, how to achieve cloning using Serialization and Copy constructors and advantages copy of copy constructors over Java cloning. If you have read those articles you can easily understand why it is good to use Copy constructors over cloning or Object.clone(). In this article, I am going to discuss why copy constructor are not sufficient? Yes, you are reading it right copy constructors are not sufficient by themselves, copy constructors are not polymorphic because constructors do not get inherited to the child class from the parent class. If we ...

In my previous article Java Cloning and Types of Cloning (Shallow and Deep) in Details with Example , I have discussed Java Cloning in details and answered questions about how we can use cloning to copy objects in Java, what are two different types of cloning (Shallow & Deep) and how we can implement both of them, if you haven’t read it please go ahead. In order to implement cloning, we need configure our classes to follow below steps Implement Cloneable interface in our class or its superclass or interface, Define clone() method which should handle CloneNotSupportedException (either throw or log), And in most cases from our clone() method we call the clone() method of the superclass. And super.clone() will call its super.clone() and chain will continue until call will reach to clone() method of the Object class which will create a field by field mem copy of our object and return it back. Like everything Cloning also comes with its advantages and disadvantages. However, Java c...

In my previous article 5 Different ways to create objects in Java with Example , I have discussed 5 different ways (new keyword, Class.newInstance() method, Constructor.newInstance() method, clone() method and deserialization) a developer can use to create objects, if you haven't read it please go ahead. Cloning is also a way of creating an object but in general, cloning is not just about creating a new object. Cloning means creating a new object from an already present object and copying all data of given object to that new object. In order to create a clone of an object we generally design our class in such way that Our class should implement Cloneable interface otherwise, JVM will throw CloneNotSupportedException if we will call clone() on our object. Cloneable interface is a marker interface which JVM uses to analyse whether this object is allowed for cloning or not. According to JVM if yourObject instanceof Cloneable then create a copy of the object otherwise throw ...