This is for two reasons: Not every object defines a working clone () method, so deep copying isnt always possible. We will cover few different options to make a deep copy of an object in Java.ġ. In Java, clone () is almost always shallow. Besides these, we can also create a clone or copy of a Map. The object created through deep copy is not dependent upon the original object. In Java, HashMap is a Hashtable-based implementation.The implementation of the HashMap allows us to apply all the optional Map operations like add data to Map, delete data from the Map, retrieve key-value from the Map, determine the Map size, etc. Deep cloning is closely related to Java serialization.ĭeep copy technique copies each mutable object in the object graph recursively. The deep copy approach in Java will copy the entire object tree and thus make this copy independent from the original object.In this article, we will focus on a deep copy of an object in Java. Shallow copy approach only copy field values, this approach is not complete as the copy may depend on the original object. my deepCopy wont change I know that orginal. However, this approach does not work with maps that specified an initial capacity. when two references point to the same object, changes to one will reflect in the other. Serialization and deserialization have been a preferred and accepted method of deep copying objects with complicated graphs (How do you make a deep copy of an object in Java etc.) where the copy constructor/factory method approach is not well suited. While creating a copy of Java objects, we have the following two options for creating a copy HashMap deepCopy deepCopy (original) so that if I change the original. What you did was not to create a copy of the map, but of the reference to it. In this article, we will discuss as of how to make a deep copy of an object in Java.
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