I read many times that Thread.stop is deprecated and it is unsafe to use it. But

  Click here to read full story

Question: I read many times that Thread.stop is deprecated and it is unsafe to use it. But never got good explanation why....

Answer: Because it is inherently unsafe. Stopping a thread causes it to unlock all the monitors that it has locked. (The monitors are unlocked as the ThreadDeath exception propagates up the stack.) If any of the objects previously protected by these monitors were in an inconsistent state, other threads may now view these objects in an inconsistent state. Such objects are said to be damaged. When threads operate on damaged objects, arbitrary behavior can result. This behavior may be subtle and difficult to detect, or it may be pronounced. Unlike other unchecked exceptions, ThreadDeath kills threads silently; thus, the user has no warning that his program may be corrupted. The corruption can manifest itself at any time after the actual damage occurs, even hours or days in the future.
http://java.sun.com/products/jdk/1.2/docs/guide/misc/threadPrimitiveDeprecation.html
*******************************************
Our older tips: March 22, 2001 - October 21, 2002 READ HERE
All published and not published on the site tips read HERE

53 comments |    | Score: 0

Java Newsletters: Java Newsletters Archive: 182

  Click here to read full story

=== [ The Java FAQ Daily Tips, weekly publication ] ===

Foreword: Excuse me for possible mistakes. English is not native language for me.

In this issue:

Hello dear friends!

Question: What's New in the J2ME Wireless Toolkit 2.0?

Answer: The J2ME Wireless Toolkit contains everything you need to develop MIDP applications.
New Emulator Skins
The J2ME Wireless Toolkit 2.0 includes an entirely new emulator skin, QwertyDevice. Sporting a whopping 640 x 240 pixel color screen and a full keyboard, QwertyDevice represents a wireless communicator, a level beyond a mobile phone.

The Vanguard of MIDP 2.0
The J2ME Wireless Toolkit 2.0 emulator implements the MIDP 2.0 specification, which includes dozens of exciting features, including:

• Secure networking with HTTPS
• Support for playing simple tones and sampled audio data
• The ability to create custom item components for forms
• A game API
• Use of int arrays to represent and manipulate images
• A permission-based security architecture
• A push registry that enables MIDlets to receive incoming network connections

Check Out the Sound System
One of the new features in MIDP 2.0 is the ability to play sampled audio and simple audio tones. The J2ME Wireless Toolkit 2.0 supports the full Mobile Media API 1.0.

Setting MIDlet Permissions

Working with Protection Domains
A protection domain determines whether a permission is granted or denied.

Signing MIDlet Suites

A Killer Feature: Run via OTA
To test installation behavior, the push registry, and signed MIDlets use new option in the Project menu, Run via OTA.

More details can be found here:
http://wireless.java.sun.com/midp/articles/wtk20/

Question: How can I color in real time user text input?

Answer: Sometime it is easier to use already developed libraries and save money and time.
An good example of such method is JSyntaxColor.
JSyntaxColor is a library for coloring in real time user text input.

Main features:

• Standard EditorKit
• Simple property file for each syntax description
• Real time switch between syntax descriptions
• Very compact and fast
• Inner cache for limiting parsing scope

Tokens libraries customizable by user
Color, Underline, Border attributes support
Sample for Java/SQL/Formula syntax

Many samples for API interesting parts
Open source for the registered version
JDK 1.2 compliant

Evaluation copy can be found at: http://www.japisoft.com/syntaxcolor/index.html

6 comments |    | Java Newsletters | Score: 1