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1. #JAVA REFLECTION TO SERIALIZE FOR ANDROID#
2. #JAVA REFLECTION TO SERIALIZE ANDROID#
3. #JAVA REFLECTION TO SERIALIZE CODE#

Java HashMap allows null values and the null key. A Map, as you might know, is a collection of key-value pairs. Java HashMap is a hash table based implementation of Java's Map interface. To make a Java object serializable we implement the java. Deserialization is the reverse process where the byte stream is used to recreate the actual Java object in memory. Serialization is a mechanism of converting the state of an object into a byte stream. įurthermore, what is serialization in Java? ser, using the writeObject( ) method of ObjectOutputStream.

#JAVA REFLECTION TO SERIALIZE CODE#

Then, in the three lines of code inside the try block, we write the Hashtable to a file called h. First we construct a Hashtable with a few elements in it. Secondly, is Hashtable serializable Java? The Hashtable object is serializable because it implements the Serializable interface. So objects which implement one of the Collection-interfaces are serializable if the implementation itself is serializable (which is usually the case) and if the objects in the collection are all serializable. In Java, the Collection-interfaces do not extend Serializable for several good reasons. Serialization: It is a process of writing an Object into file along with its attributes and content.Ĭonsequently, are collections serializable in Java? RegistrationPogo registrationPogo= getIntent().HashMap class is serialized by default which means we need not to implement Serializable interface in order to make it eligible for Serialization. Intent.putParcelableArrayListExtra("data", pacableArray) I ran a test and here are my findings: Intent intent = new Intent(ParcelableActivity.this, RegistrationSuccessActivity.class) Due to this, the Serialization process is slow in comparison to Parcelable. This helps identify the Java objects member and behavior, but also ends up creating a lot of garbage objects. In Serialization, a marshaling operation is performed on a Java Virtual Machine (JVM) using the Java reflection API. Serialization is a marker interface, which implies the user cannot marshal the data according to their requirements.The performance of Parcelable over Serialization dramatically improves (around two times faster), because of this custom implementation. In Parcelable, developers write custom code for marshaling and unmarshaling so it creates less garbage objects in comparison to Serialization.

#JAVA REFLECTION TO SERIALIZE ANDROID#

It is for this very reason that Android developers prefer Parcelable over the Serialization technique.

Parcelable and Serialization are used for marshaling and unmarshaling Java objects. The second is to create a static Parcelable.Creator object to de-serialize the Java object.ĭifferences between Serialization and Parcelable param buffer The buffer to which the object will be serialized. The first step is to override the writeToParcel() method and write all object members into parcel objects. The object must implement java.io.Serializable. If a developer wants to convert a Java object into Parcelable, then the best way to do so is by implementing the Parcelable interface and overriding the writeToParcel() methods in its own class. Here’s why:Īndroid Parcelable implementation allows objects to read and write from Parcels which can contain flattened data inside message containers. The fact that Parcelable is faster than Serialization makes it a preferred choice of approach while passing an object. Developers can opt from the two types of object passing techniques, i.e.

Serialization, on the other hand, is a Java interface that allows users to implement the interface which gets marked as Serializable.ĭuring the Android application development process, developers often have to send Java class objects from one activity to another activity using the intent. If a user wants to send Java objects through intent, Java class should be implemented using the Parcelable interface. All you have to do is put the data with unique key in intents and send it to another activity. through intents is quite easy in Android. Passing primitive data types like string, integer, float, etc. This blog is my attempt to compare the two techniques and cite an example to help decide which one of these is the best approach for passing an object from one activity to another.

#JAVA REFLECTION TO SERIALIZE FOR ANDROID#

Android developers often face a predicament while passing object references to activities of whether to go with the Java Serialization method or opt for Android Parcelable.