What if some fields don't want to be serialized?

First, let's wire up what is serialization?What is deserialization?

If we need to persist Java objects, such as saving Java objects in files, or transmitting Java objects over the network, serialization is required in these scenarios.

• Serialization

The process of converting a data structure or object into a stream of binary bytes.

• Deserialization

The process of converting the binary byte stream generated during serialization into a data result or object.

In the Java language, what we serialize is the object (Object), that is, the instantiated class (class), but in the half-faced object language such as C++, the struct (structure) defines the dataStructural types, and classes correspond to object types.

So, the main purpose of serialization is to transfer objects over the network or to store objects in the file system, database, or memory.

• What if some fields do not want to be serialized?

For variables that do not want to be serialized, use the transient keyword to modify them.

• transient keywords do

Prevent the serialization of variables in the instance that are modified with this keyword; when the object is deserialized, the value of the variable modified by transient will not be persisted and restored.

• A few more notes about transient:
• transient can only modify variables, not classes and methods.
• Transient modified variables, the variable value will be set to the default value of the type after deserialization.For example, if it is a modified int type, the result after deserialization is 0.
• Because the static variable does not belong to any object (Object), it will not be serialized whether it is modified with the transient keyword or not.