//ClassObjectIODemo.java

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;

public class ClassObjectIODemo
{
    public static void main(String[] args)
    {
        ObjectOutputStream outputStream = null;
        String fileName = "species.records";
        try
        {
            outputStream =
                new ObjectOutputStream(new FileOutputStream(fileName));
        }
        catch (IOException e)
        {
            System.out.println("Error opening output file " + fileName + ".");
            System.exit(0);
        }
        Species califCondor = new Species("Calif. Condor", 27, 0.02);
        Species blackRhino = new Species("Black Rhino", 100, 1.0);
        try
        {
            outputStream.writeObject(califCondor);
            outputStream.writeObject(blackRhino);
            outputStream.close();
        }
        catch (IOException e)
        {
            System.out.println("Error writing to file " + fileName + ".");
            System.exit(0);
        }
        System.out.println("Records sent to file " + fileName + ".");
        System.out.println("Now let's reopen the file and echo the records.");
        ObjectInputStream inputStream = null;
        try
        {
            inputStream =
                new ObjectInputStream(new FileInputStream("species.records"));
        }
        catch (IOException e)
        {
            System.out.println("Error opening input file " + fileName + ".");
            System.exit(0);
        }
        Species readOne = null, readTwo = null;
        try
        {
            readOne = (Species)inputStream.readObject();
            readTwo = (Species)inputStream.readObject();
            inputStream.close();
        }
        catch (Exception e)
        {
            System.out.println("Error reading from file " + fileName + ".");
            System.exit(0);
        }
        System.out.println("The following were read\n"
            + "from the file " + fileName + ".");
        System.out.println(readOne);
        System.out.println();
        System.out.println(readTwo);
        System.out.println("End of program.");
    }
}