java object serialize example for my friend

MyData.java

import java.io.Serializable;

// custom data class
// must implements Serializable 

public class MyData implements Serializable {
	int id;
	String name;

	MyData(int id, String name) {
		this.id = id;
		this.name = name;
	}
}

MyRead.java

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.Serializable;

// object read part
// cast to custom class

public class MyRead {
    public static void main(String[] args)
            throws IOException, FileNotFoundException, ClassCastException, ClassNotFoundException {
        FileInputStream fin = new FileInputStream("./my.ser");
        ObjectInputStream ois = new ObjectInputStream(fin);

        for (int i = 0; i < 2; i++) {
            Object readData = ois.readObject();

            if (readData == null) {
                System.out.println("no data");
            } else {
                MyData data = (MyData) readData;
                System.out.println(data);
            }
        }
    }
}

MyWrite.java

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.ArrayList;

// object write part

public class MyWrite {
	public static void main(String[] args) throws IOException, FileNotFoundException {
		FileOutputStream stream = new FileOutputStream("./my.ser", true);
		ObjectOutputStream objectOutputStream = new ObjectOutputStream(stream);

		for (int i = 0; i < 3; i++) {
			objectOutputStream.writeObject(new MyData(10, "name"));
		}

		objectOutputStream.close();
		stream.close();
	}
}