//WriteObject Class
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectOutputStream;
import java.util.logging.Level;
import java.util.logging.Logger;

public class WriteObject {
    public static void main (String[] args){
        System.out.println("Writing Objects....");
        
        Person mike=new Person(543,"Bulbul");
        Person sue=new Person(123,"Chintu");
        
        System.out.println(mike);
        System.out.println(sue);
        
        try(FileOutputStream fs=new FileOutputStream("d:\\people.bin")){
            ObjectOutputStream os=new ObjectOutputStream(fs);
            os.writeObject(sue);
            os.writeObject(mike);
            os.close();
        } catch (FileNotFoundException ex) {
            Logger.getLogger(WriteObject.class.getName()).log(Level.SEVERE, null, ex);
        }catch (IOException e){
            e.printStackTrace();
        }
    }
}

//Person Class
import java.io.Serializable;

public class Person implements Serializable {
    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 + '}';
    }
    
    
}