What is the result(ObjectOutputStream)? : Questions « File « SCJP

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2. File
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import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;

class Player {
  Player() {
    System.out.print("p");
  }
}

class MainClass extends Player implements Serializable {
  MainClass() {
    System.out.print("c");
  }

  public static void main(String[] args) {
    MainClass c1 = new MainClass();
    try {
      FileOutputStream fos = new FileOutputStream("play.txt");
      ObjectOutputStream os = new ObjectOutputStream(fos);
      os.writeObject(c1);
      os.close();
      FileInputStream fis = new FileInputStream("play.txt");
      ObjectInputStream is = new ObjectInputStream(fis);
      MainClass c2 = (MainClass) is.readObject();
      is.close();
    } catch (Exception x) {
    }
  }
}