import java.io.*;
import java.nio.file.Path;
import java.nio.file.Paths;

public class TestDataObjects {
  public static void main(String[] args) {
    Data data = new Data(1);
     Path file = Paths.get("C:/Beg Java Stuff/dataObjects.bin");
    try {
      // Create the object output stream
      ObjectOutputStream objectOut = new ObjectOutputStream(new BufferedOutputStream(file.newOutputStream()));

      // Write three variants of the object to the file
      objectOut.writeObject(data);                                     // Write object
      System.out.println("1st Object written has value: "+data.getValue());
      data.setValue(2);                                                // Modify the object
      objectOut.writeObject(data);                                     // and write it again
      System.out.println("2nd Object written has value: "+data.getValue());
      data.setValue(3);                                                // Modify the object again...
      objectOut.writeObject(data);                                     // and write it once more
      System.out.println("3rd Object written has value: "+data.getValue());
      objectOut.close();                                               // Close the output stream

    } catch(IOException e) {
      e.printStackTrace();
      System.exit(1);
    }

    // Read the three objects back from the file
    System.out.println("\nReading objects from the file: ");
    try {ObjectInputStream objectIn = new ObjectInputStream(new BufferedInputStream(file.newInputStream()));

      Data data1 = (Data)objectIn.readObject();
      Data data2 = (Data)objectIn.readObject();
      Data data3 = (Data)objectIn.readObject();
      System.out.println("1st object is " + (data1.equals(data2)? "" : "not ")
                       + "Equal to 2nd object.");
      System.out.println("2nd object is " + (data2.equals(data3)? "" : "not ")
                       + "Equal to 3rd object.");

      System.out.println("data1 = "+data1.getValue()                   // Display object values
                       + "  data2 = " + data2.getValue()
                       + "  data3 = "+data3.getValue());
      objectIn.close();                                                // Close the input stream

    } catch(ClassNotFoundException e) {
      e.printStackTrace();
      System.exit(1);
    } catch(IOException e) {
      e.printStackTrace();
      System.exit(1);
    }
  }
}