We have seen that serialization in java is automatic and all we need is implementing Serializable interface. The implementation is present in the ObjectInputStream and ObjectOutputStream classes. But what if we want to change the way we are saving data, for example we have some sensitive informa...
In this example,person1andperson2share the sameAddressobject. Whenperson1andperson2are serialized, theAddressobject is serialized only once. During deserialization, theAddressobject is restored only once and shared byperson1andperson2. This is because Java serialization maintains the object graph, pres...
Always include it as a field, for example: “private static final long serialVersionUID = 7526472295622776147L; ” include this field even in the first version of the class, as a reminder of its importance. Do not change the value of this field in future versions, unless you are knowingly ...
import java.io.*; public class SerializationExample { public static void main(String[] args) { // 创建一个对象 Person person = new Person("John Doe", 30); // 序列化对象 try (ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream("person.ser"))) { oos.writeObject(person)...
java.io.serializable java.ioExternalizable ObjectInputStream ObjectOutputStream Marker interface Marker Interface is a special interface in Java without any field and method. Marker interface is used to inform compiler that the class implementing it has some special behaviour or meaning. Some example of...
Let's take a look at the key points in this example 1. We declare that the Employee class implements the Serializable interface. Serializable is a marker interface; it has no methods to implement. 2. We make a new Employee object, which as we know is Serializable. ...
The test below shows an example of saving an object of typePersonto a local file, and then reading the value back in: @Test public void whenSerializingAndDeserializing_ThenObjectIsTheSame() () throws IOException, ClassNotFoundException { Person person = new Person(); person.setAge(20); per...
it's also the most controllable. An example situation for that alternate type of serialization: read and write PDF files with a Java application. If you know how to write and read PDF (the sequence of bytes required), you could provide the PDF-specific protocol in thewriteExternalandreadExte...
package java.io; public class ObjectStreamField implements Comparable { public ObjectStreamField(String fieldName, Class fieldType); public ObjectStreamField(String fieldName, Class fieldType, boolean unshared); public String getName(); public Class getType(); public String getTypeString(); public ...
ObjectStreamExceptionSuperclass of all serialization exceptions. InvalidClassExceptionThrown when a class cannot be used to restore objects for any of these reasons: The class does not match the serial version of the class in the stream.