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serializing java codes

mike saggese

Joined: Nov 27, 2012
Posts: 8
I could use some help here. I tried to modified the java codes to do what I'm asked to do. here it is

This project consists of three complete and individual subprojects (you need to work in the same subfolder for this assignment). Hints: to write objects with an ObjectOutputStream, the objects classes must implement interface Serializable; coderelated to processing object streams might throw exceptions and these exceptions must be caught.
1) Modify the Employee hierarchy from Figs. 10.4–10.8 to enable serialization of the classes in the hierarchy. Then, modify the application of Fig. 10.9 to output each object in the array employees to a file using object serialization.

2) Modify the application of Fig. 10.9 to read the objects in the file EmployeeData.ser into an array called employees, then output the contents of the array polymorphically as in Fig. 10.9.

3) Since arrays are objects in Java, entire arrays of Serializable objects can be output simply by passing an array’s name to an ObjectOutputStream’s writeObject method. Similarly, an entire array of Serializable objects can be read with a single call to an ObjectInputStream’s readObject method. Modify class OutputEmployees from the above step 1 to write the entire array to the file with a single output statement. Then, modify class InputEmployees from the above step 2 to read the entire array with a single statement.

Tony Docherty

Joined: Aug 07, 2007
Posts: 2315
That's a lot of code to wade through.
Which parts of the assignment have you completed/are you stuck on and what do you not understand?
Taylor Smolik

Joined: Dec 04, 2012
Posts: 2
Well without reading all of your code, it sounds like you need to implement serializable in some of your object classes.
You do this in the following format:

You will then import;
Also, you should declare a serialVersionUID
(java will usually ask to assign this for you)

Campbell Ritchie

Joined: Oct 13, 2005
Posts: 39395
Taylor Smolik wrote: . . .
Also, you should declare a serialVersionUID
. . .
At this stage, adding an SUID simply complicates things. You can get away with omitting the SUID.

You are however right, that every class in sight must implement the Serializable interface. Some classes (eg String) already do.
I agree. Here's the link:
subject: serializing java codes