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Nothing in a non-serializable class will be written out to file, and attempting to serialize such a class will result in an exception being thrown. Only a class that implements Serializable or one that extends such a class can successfully be serialized (or de-serialized).

Noncompliant Code Example
public class Vegetable {  // neither implements Serializable nor extends a class that does
  //...
}

public class Menu {
  public void meal() throws IOException {
    Vegetable veg;
    //...
    FileOutputStream fout = new FileOutputStream(veg.getName());
    ObjectOutputStream oos = new ObjectOutputStream(fout);
    oos.writeObject(veg);  // Noncompliant. Nothing will be written
  }
}


Compliant Solution
public class Vegetable implements Serializable {  // can now be serialized
  //...
}

public class Menu {
  public void meal() throws IOException {
    Vegetable veg;
    //...
    FileOutputStream fout = new FileOutputStream(veg.getName());
    ObjectOutputStream oos = new ObjectOutputStream(fout);
    oos.writeObject(veg);
  }
}