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Easy Learn Java: Programming Articles, Examples and Tips - Page 7


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A new toolset for creating web-based user interfaces with Java

Go to all tips in Java Applets

IT Mill Ltd has released Millstone version 3.0, a user interface library for creating Internet applications with Java.

Millstone provides a complete UI component framework, terminal independency and themes. Millstone is Open Source software and it is downloadable freely from the Millstone.org website.


For more information and on-line demos, go to:
http://www.millstone.org

IT Mill Ltd has released Millstone version 3.0, a user interface library for creating Internet applications with Java. Millstone provides a complete UI component framework, terminal independency and themes.

Millstone is Open Source software and it is downloadable freely from the Millstone.org website.

Millstone is a user interface library for development of Internet and mobile-based applications with Java. It eases web-based application development, because it provides a wide set of reusable server side components for creation of user interfaces. It provides complete UI component framework utilizing XML and XSLT for terminal independency and themes.

The development model of Millstone is closely related to traditional client-side UI development model. It has a continuous application lifecycle and an extensive event model. Millstone also provides an interface for directly connecting UI components to business logic and data storage. Millstone provides terminal independency by using adapters for connecting components to different terminals.

At the moment, Millstone includes the Web Adapter, which is used for presenting applications in web browsers. The Web Adapter runs on a Java application server as a Servlet and thus it is easily usable alongside other Servlets and JSP-pages. The Web Adapter includes a default theme that supports the most common web browsers, both with and without JavaScript.

Adaptation of the Millstone UI components to the web includes theme generation with XML transformations, automatic form parameter mapping and dependency sorting of userinvoked events. In addition to the traditional http-page request model, server initiated events are supported by using http-streams.

Millstone version 3.0 enhances the feature browser application to include examples of most of the Millstone components and features. This release also implements support for non-JavaScript browsers in the default theme and includes bug fixes and updates to the Base and Web Adapter packages. For more information and on-line demos, go to:
http://www.millstone.org


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Posted by Anonymous on Monday, December 09, 2002 (10:04:12) (4153 reads)

Java encapsulation gotchas

Go to all tips in General Java

... When you return a Char, others can alter the Char they received without modifying the Char, as stored in your application, because Java uses pass by value to ...


Encapsulation is one of the tenets of object-oriented programming.

It states that objects should hide their inner workings from external view. Good encapsulation increases code modularity by preventing objects from interacting with each other in unexpected ways, which in turn makes future development efforts and refactoring easier.

Getters and setters

The first step toward building objects with good encapsulation is to have the getter/setter pair access private data fields. Requiring other objects that want to read and write fields in your object to do so through a mechanism you control allows you to enforce legal values and general internal data consistency.

If you have a field named duration that is expected to hold a positive integer, you can throw an IllegalArgumentException when another object tries to setDuration(-4).

If you’ve left your duration member public, you can’t prevent someone from calling yourObject.duration=-4 and messing up the internal consistency of your data.

Immutability of return values

The data that your object makes available through method return values should not be modifiable in a way that alters the internal state of your object. Returning primitives provides no worry in this regard.

When you return a Char, others can alter the Char they received without modifying the Char, as stored in your application, because Java uses pass by value to return primitives.

However, when returning objects, you must be careful to monitor their mutability. When an object’s value cannot be altered after instantiation, it is said to be immutable.

Many of the objects in the java.lang package hierarchy are immutable, including String, Char, and Short. Making an object immutable requires three steps:
Read about it here at Builder.com


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Posted by Anonymous on Wednesday, December 04, 2002 (09:50:16) (6145 reads)

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