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Easy Learn Java: Programming Articles, Examples and Tips - Page 49


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I write my data into a file with serialization methods (Java 1.1.8). How can I r

Go to all tips in Networking

Question: I write my data into a file with serialization methods (Java 1.1.Cool. How can I read this file back with serialization methods in Java 1.2.2? I have compatibility exceptions!

Answer: Java has two serialization protocols.
Keep in mind that:
JDK 1.1.x write using PROTOCOL_VERSION_1 (default)
JDK 1.2.x write using PROTOCOL_VERSION_2 (default)
JDK 1.1.7 and higher can read both protocols

As you see with JDK 1.1.7 you can read/write with both protocol versions. You just need to synchronize them.

If you use JDK 1.2 and higher you can override the default protocol version by using:

ObjectInputStream.useProtocolVersion(PROTOCOL_VERSION_1)

Usage PROTOCOL_VERSION_1 provides compatibility with all Java
versions.

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2 comments | Printer Friendly Page  Send to a Friend | Score: 5
Posted by jalex on Monday, May 05, 2003 (00:00:00) (6341 reads)

I need ''Always On Top'' functionality for my GUI... How could I do that?

Go to all tips in Swing, AWT

Question: I need "Always On Top" functionality for my GUI... How could I do that?

Answer: One of the main points of Java is to be completely platform independent. However, sometimes it will occur that the developer of an application will know that his or her application is only going to be run on a specific platform, for example, Win32.

Below are the steps for writing a Java application that makes a Win32 API call. The application generates a Swing JFrame and makes it system modal, or gives it the "Always On Top" functionality, similar to that of the Windows NT Task Manager:

1. Write the Java code for the application
2. Run javah.exe on your .class file to generate a C header file
3. Write the implementation of your native methods
4. Create the shared library
5. Run the application

The full text of this article and implementation code is here:
http://community.borland.com/article/0,1410,20679,00.html

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6 comments | Printer Friendly Page  Send to a Friend | Score: 1.4
Posted by jalex on Saturday, May 03, 2003 (00:00:00) (12329 reads)

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