Tutorial 46 Serializing Arrays

//Tutorial 46 Serializing Arrays
//no idea whats going on

//---------------------------------------------------------------------------------------------------------------------------------------
//Person.java
import java.io.Serializable;

public class Person implements Serializable {
    /**
     *
     */
    private static final long serialVersionUID = 4801633306273802062L;

    private int id;
    private String name;

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

    @Override
    public String toString() {
        return "Person [id=" + id + ", name=" + name + "]";
    }
//---------------------------------------------------------------------------------------------------------------------------------------
//WriteObjects.java
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectOutputStream;
import java.util.ArrayList;
import java.util.Arrays;


public class WriteObjects {

    public static void main(String[] args) {
        System.out.println("Writing objects...");

        Person[] people = {new Person(1, "Sue"), new Person(99, "Mike"), new Person(7, "Bob")};

        ArrayList<Person> peopleList = new ArrayList<Person>(Arrays.asList(people));

        try(FileOutputStream fs = new FileOutputStream("test.ser")) {

            ObjectOutputStream os = new ObjectOutputStream(fs);

            // Write entire array
            os.writeObject(people);

            // Write arraylist
            os.writeObject(peopleList);

            // Write objects one by one
            os.writeInt(peopleList.size());

                for(Person person: peopleList){
                    os.writeObject(person);
                }


            os.close();

        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        }

}

//---------------------------------------------------------------------------------------------------------------------------------------
//ReadObjects.java

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.util.ArrayList;


public class ReadObjects {
    public static void main(String[] args){
        System.out.println("Reading Objects...");


        try(FileInputStream fi = new FileInputStream("test.ser")) {

            ObjectInputStream os = new ObjectInputStream(fi);

            // Read entire array
            Person[] people = (Person[])os.readObject();

            // Read entire arraylist
            @SuppressWarnings("unchecked") //Suppresses warnings
            ArrayList<Person> peopleList = (ArrayList<Person>)os.readObject();

            for(Person person: people) {
                System.out.println(person);
            }
            for(Person person: peopleList) {
                System.out.println(person);
            }

            // Read objects one by one.
            int num = os.readInt();

            for(int i=0; i<num; i++) {
                Person person = (Person)os.readObject();
                System.out.println(person);
            }

            os.close();

        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            e.printStackTrace();

        }
    }
}

//---------------------------------------------------------------------------------------------------------------------------------------
//if you run the ReadObjects.java tab this should be the run result:
/*
Reading Objects...
Person [id=1, name=Sue]
Person [id=99, name=Mike]
Person [id=7, name=Bob]
Person [id=1, name=Sue]
Person [id=99, name=Mike]
Person [id=7, name=Bob]
Person [id=1, name=Sue]
Person [id=99, name=Mike]
Person [id=7, name=Bob]
*/