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Try to recover a serialized file without the class of object thats stored in that file

import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.ObjectInputStream; import java.io.ObjectOutput; import java.io.ObjectOutputStream; import java.io.Serializable; public class MainClass {   public static void main(String[] args) throws Exception {     ObjectOutput out = new ObjectOutputStream(new FileOutputStream("X.file"));     MyClass zorcon = new MyClass();     out.writeObject(zorcon);          ObjectInputStream in = new ObjectInputStream(new FileInputStream(new File("X.file")));       Object mystery = in.readObject();       System.out.println(mystery.getClass());        } } // A serializable class. class MyClass implements Serializable { }