Why serialization in java

# Serialization is a mechanism used to process streams of objects.                                                                                                                                                                                                                                                               (recommended learning: java course)

The so-called object stream: is to stream the content of the object. The streamed objects can be read and written, and the streamed objects can also be transmitted between networks.

Serialization is to solve the problems caused when reading and writing object streams.

Implementation of serialization:

The class that needs to be serialized implements the Serializable interface (marker interface). This interface has no methods that need to be implemented, implements Serializable is just to mark that the object can be serialized, and then use an output stream (such as FileOutputStream) to construct an ObjectOutputStream (object stream) object;

Then, use the writeObject(Object obj) of the ObjectOutputStream object The method can write out the object whose parameter is obj (that is, save its state). If you want to restore it, use the input stream.

When to use serialization?

1: Object serialization can realize distributed objects.

Main applications such as: RMI (Remote Method Invocation) uses object serialization to run services on the remote host, just like when running objects on the local machine.

2: Java object serialization not only retains the data of an object, but also recursively saves the data of each object referenced by the object.

The entire object hierarchy can be written to a byte stream, which can be saved in a file or passed over a network connection. Object serialization can be used to perform "deep copy" of the object, that is, copying the object itself and the referenced object itself. Serializing an object may result in the entire object sequence.

Three: Serialization can write classes in memory to files or databases.

For example: serialize a class and save it as a file. The next time you read it, you only need to deserialize the data in the file to restore the original class to the memory.

Classes can also be serialized into stream data for transmission. In general, it is to convert an instantiated class into a file for storage. The next time you need to instantiate it, you only need to deserialize it to instantiate the class into memory and retain all the variables and states in the class during serialization.

Four: Objects, files, and data come in many different formats, making it difficult to transmit and save them uniformly.

After serialization, it will be a byte stream. No matter what it is originally, it can be turned into the same thing, and it can be transmitted or saved in a common format. After the transmission is completed, it needs to be processed again. When used, deserialize and restore, so that the object is still an object and the file is still a file

Because in JAVA, the object must be serialized into a stream for transmission.

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