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public class Point implements Serializable {
  private double x;
  private double y;

  public Point(double x, double y) {
    this.x = x;
    this.y = y;
  }

  public Point() {
    // No-argument constructor
  }
}

public class Coordinates extends Point implements Serializable {
  public static void main(String[] args) {
    FileOutputStream fout = null;
    try {
      Point p = new Point(5, 2);
      fout = new FileOutputStream("point.ser");
      ObjectOutputStream oout = new ObjectOutputStream(fout);
      oout.writeObject(p);
    } catch (Throwable t) { 
      // Forward to handler 
    } finally {
      if (fout != null) {
        try {
          fout.close();
        } catch (IOException x) {
          // Handle error
        }
      }
    }
  }
}

public class Point implements Serializable {
 private transient double x; // Declared transient
 private transient double y; // Declared transient

 public Point(double x, double y) {
  this.x = x;
  this.y = y;
 }

 public Point() {
   // No-argument constructor
 }
}

public class Coordinates extends Point implements Serializable {
  public static void main(String[] args) {
    FileOutputStream fout = null;
    try {
      Point p = new Point(5,2);
      fout = new FileOutputStream("point.ser");
      ObjectOutputStream oout = new ObjectOutputStream(fout);
      oout.writeObject(p);
      oout.close();
    } catch (Exception e) {
      // Forward to handler
    } finally {
      if (fout != null) {
        try {
          fout.close();
        } catch (IOException x) {
          // Handle error
        }
      }
    }
  }
}