Understand when to serialize v. externalize objects in Java - Program - Java C... - The Diigo Meta page

• 14 Oct 09
  

  Paulista .TK

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  • : When you serialize an Externalizable object, a default constructor will be called automatically; only after that will the readExternal() method be called. Listing C shows how you can use externalization.
  • import java.io.*;
     
     public class GetAlienClass {
    public static void main(String[] args)
    throws IOException, ClassNotFoundException {
    ObjectInputStream in = new ObjectInputStream(
    new FileInputStream("alien.obj"));
    Object obj = in.readObject();
     
    // Here you will get ClassNotFoundException
    System.out.println(obj.getClass());
    }
      }
  • import java.io.*;
     
     public class Data implements Serializable {
    public static void main(String[] args)
    throws ClassNotFoundException, IOException {
    Data d = new Data();
    ObjectOutputStream out = new ObjectOutputStream(
    new FileOutputStream("data.out"));
    out.writeObject("Data storage");
    out.writeObject(d);
    out.close();
    
    ObjectInputStream in = new ObjectInputStream(
    new FileInputStream("data.out"));
    String s = (String)in.readObject();
    Data d2 = (Data)in.readObject();
    }
      }

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