---------- Forwarded message ----------
From: Adam Smith <[email protected]>
Date: Wed, Apr 22, 2009 at 4:12 PM
Subject: Re: [java programming] Re: Help.......LAB-1043......Serialization
To: [email protected]
Thanks for your help. Once I did all this, it still didnt change the
value. Here's an example of the school class's code.
public class School implements Serializable{
private String nameOfSchool;
transient private int yearStarted;
public String getNameOfSchool() {
return nameOfSchool;
}
public int getYearStarted() {
return yearStarted;
}
public void setNameOfSchool(String nameOfSchool) {
this.nameOfSchool = nameOfSchool;
}
public void setYearStarted(int yearStarted) {
this.yearStarted = yearStarted;
}
public School(){
}
public static School getSchool(String nameOfSchool, int yearStarted){
School temp = new School();
temp.setNameOfSchool(nameOfSchool);
temp.setYearStarted(yearStarted);
return temp;
}
@Override
public String toString(){
StringBuffer myBuffer = new StringBuffer();
myBuffer.append(this.nameOfSchool+" ,"+this.yearStarted);
return myBuffer.toString();
}
}
___________________________________________________________________________
public class MyClassToBePersisited implements Serializable{
static final long serialVersionUID = -3126998878902358585L;
private Date time;
private School school;
private Profile profile;
public MyClassToBePersisited(School school, Profile profile) {
//time = Calendar.getInstance().getTime();
this.school = school;
this.profile = profile;
}
public School getSchool(){
return school;
}
public void setProfile(Profile profile) {
this.profile = profile;
}
public void setSchool(School school) {
this.school = school;
}
public Profile getProfile(){
return profile;
}
public Date getTime() {
return time;
}
}
____________________________________________________________________________________________
public class DeserializeMyClassToBePersisted {
public static void main(String [] args) {
String filename = "MyClassToBePersisited.ser";
if(args.length > 0) {
filename = args[0];
}
// Deserialize the previously saved
// PersistentTime object instance.
MyClassToBePersisited myPers = null;
FileInputStream fis = null;
ObjectInputStream in = null;
try {
fis = new FileInputStream(filename);
in = new ObjectInputStream(fis);
myPers = (MyClassToBePersisited)in.readObject();
in.close();
} catch(IOException ex) {
ex.printStackTrace();
} catch(ClassNotFoundException ex) {
ex.printStackTrace();
}
// print out restored time
School mySchool = myPers.getSchool();
Profile myProfile = myPers.getProfile();
System.out.println("School: " + mySchool.toString());
System.out.println("Profile: " + myProfile.toString());
}
_________________________________________________________________________________
Everything seems to be working fine other than that one value. Is there a
readResolve() or a another method you could recommend I use? So
frustrating.
On Wed, Apr 22, 2009 at 3:14 PM, miga <[email protected]> wrote:
>
>
>
> On Apr 22, 8:14 pm, Adam Smith <[email protected]> wrote:
> > I'm having a problem with my one transient integer, yearStarted. For
> some
> > reason, it continuously returns a '0' (instead of the desired integer).
> >
> > public MyClassToBePersisited(School school, Profile profile) {
> First, do not give parameters to your class constructor, as you cannot
> serialize them. And inside the constructor, just assign new objects to
> the private parameters. This way, you will have an object that is
> completely self-contained and therefore can be serialized and
> deserialized without loss of data.
> > this.school = School.getSchool("", 23);
> > this.profile = Profile.getProfile("TEST2", 77, "beach");
> > }
> Then in the same class define accessor for reading the parameters of
> each parameter, and use them in another public method which will
> display them. And you need also accessor in the School and Profile
> classes.
> The serialization/deserialization process has to be viewed like a
> cascade of reading completely self-contained objects, and each object
> should contain methods to access the objects contained in it, etc.
>
> Hopefully it is clear for you.
> >
> > From what I understand, transient fields are not 'serialized'.
> Therefore,
> > when I deserialize it, it automatically returns a '0'. How the heck can
> i
> > get this to work? I've been working on this for days now.
> >
> > // Deserialize the previously saved
> > // PersistentTime object instance.
> > MyClassToBePersisited myPers = null;
> > FileInputStream fis = null;
> > ObjectInputStream in = null;
> >
>
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