0410

public class Person
	implements java.io.Serializable
{
	private String name;
	private int age;
	// Note that no parameterless constructor is provided here!
	public Person(String name , int age)
	{
		System.out.println("Constructor with parameters");
		this.name = name;
		this.age = age;
	}
	// Omit the setter and getter methods of name and age

	// setter and getter methods for name
	public void setName(String name)
	{
		this.name = name;
	}
	public String getName()
	{
		return this.name;
	}

	// age's setter and getter methods
	public void setAge(int age)
	{
		this.age = age;
	}
	public int getAge()
	{
		return this.age;
	}
}

import java.io. *;
public class WriteObject
{
	public static void main(String[] args)
	{
		try(
			// Create an ObjectOutputStream output stream
			ObjectOutputStream oos = new ObjectOutputStream(
				new FileOutputStream("object.txt")))
		{
			Person per = new Person("Monkey King", 500);
			// write the per object to the output stream
			oos.writeObject (per);
		}
		catch (IOException ex)
		{
			ex.printStackTrace();
		}
	}
}

import java.io. *;
public class ReadObject
{
	public static void main(String[] args)
	{
		try(
			// Create an ObjectInputStream input stream
			ObjectInputStream ois = new ObjectInputStream(
				new FileInputStream("object.txt")))
		{
			// Read a Java object from the input stream and cast it to the Person class
			Person p = (Person)ois.readObject();
			System.out.println("Name is: " + p.getName()
				+ "\nAge is: " + p.getAge());
		}
		catch (Exception ex)
		{
			ex.printStackTrace();
		}
	}
}

import java.io. *;
public class SerializeMutable
{
	public static void main(String[] args)
	{

		try(
			// Create an ObjectOutputStream input stream
			ObjectOutputStream oos = new ObjectOutputStream(
				new FileOutputStream("mutable.txt"));
			// Create an ObjectInputStream input stream
			ObjectInputStream ois = new ObjectInputStream(
				new FileInputStream("mutable.txt")))
		{
			Person per = new Person("Monkey King", 500);
			// The system will per object convert the byte sequence and output
			oos.writeObject (per);
			// Change the name instance variable of the per object
			per.setName("Pig Bajie");
			// The system only outputs the serialization number, so the changed name will not be serialized
			oos.writeObject (per);
			Person p1 = (Person)ois.readObject();    //①
			Person p2 = (Person)ois.readObject();    //②
			// The following outputs true, that is, p1 is equal to p2 after deserialization
			System.out.println(p1 == p2);
			// The output "Monkey King" is still seen below, that is, the changed instance variable is not serialized
			System.out.println(p2.getName());
		}
		catch (Exception ex)
		{
			ex.printStackTrace();
		}
	}
}