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

public class ArrayIODemo
{
    public static void main(String[] args)
    {
        Species[] oneArray = new Species[2];
        oneArray[0] = new Species("Calif. Condor", 27, 0.02);
        oneArray[1] = new Species("Black Rhino", 100, 1.0);
        String fileName = "array.dat";
        try
        {
            ObjectOutputStream outputStream =
                  new ObjectOutputStream(
                      new FileOutputStream(fileName));
            outputStream.writeObject(oneArray);
            outputStream.close( );
        }
        catch(IOException e)
        {
            System.out.println("Error writing to file " +
                                fileName + ".");
            System.exit(0);
        }
        System.out.println("Array written to file " +
                            fileName + " and file is closed.");
        System.out.println("Open the file for input and " +
                           "echo the array.");
        Species[] anotherArray = null;
        try
        {
            ObjectInputStream inputStream = 
                       new ObjectInputStream(
                               new FileInputStream(fileName));
            anotherArray = (Species[])inputStream.readObject( );
            inputStream.close( );
        }
        catch(Exception e)
        {
            System.out.println("Error reading file " + 
                                fileName + ".");
            System.exit(0);
        }
        System.out.println("The following were read from " +
                           "the file " + fileName + ":");
        for (int i = 0; i < anotherArray.length; i++)
        {
            System.out.println(anotherArray[i]);
            System.out.println( );
        }
        System.out.println("End of program.");
    }
}