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05 Aug 08

An Introduction to Java Annotations

www.developer.com/...10936_3556176_1 - Preview

annotations java article tutorial

Class

29 May 08

Annotations

java.sun.com/...annotations.html - Preview

annotations java articles

Annotations
Annotations can be read from
source files, class files, or reflectively at run time.
6 more annotations...
- Each method declaration defines an element of the
  annotation type. Method declarations must not have any parameters or
  a throws clause
- Return types are restricted to primitives,
  String,
  Class,
  enums, annotations, and arrays of the preceding
  types. Methods can have default values.
- In annotations with a single element, the element should be named
  value, as shown belo
- run by the testing tool
- indicates that annotations
  with this type are to be retained by the VM so they can be read reflectively
  at run-time.
- The second (@Target(ElementType.METHOD)) indicates
  that this annotation type can be used to annotate only method declarations.

30 Apr 08

Java theory and practice: I have to document THAT?

www.ibm.com/...j-jtp0821.html - Preview

javadoc Productivity java

If a package, class, or method is hard to document, it's probably trying to do more than one thing at once, and this should be a clue that perhaps it needs to be re-engineered.
The self-review aspects of documentation make it all the more important that writing Javadoc be done early in the development process and then reviewed periodically as the code evolves, rather than simply waiting until the code is complete and then writing the documentation (if there's any time left).
- How the method deals with error conditions or bad inputs
- How error conditions are communicated back to the caller
- Which specific subclasses of exceptions might be thrown
- Which values are valid for inputs
- Class invariants, method preconditions, or method postconditions
- Side effects
- Whether there are important linkages between methods
- How the class deals with an instance being accessed simultaneously from multiple threads
2 more annotations...
- The Javadoc should explicitly describe the valid range of parameters; if it is expecting a parameter to be non-null, it should say so, and if it is expecting values in a certain range, such as strings of a certain length or integers greater than zero, it should say that, too. Not all methods carefully check their arguments for validity; the combination of no validity checks and no documentation on the range of acceptable inputs is a recipe for disaster.
- For
  object-valued return types, will it ever return null? For integer-valued return types, is the result restricted to a set of known values or to non-negative values? Do any return codes have special meaning, such as returning -1 from java.io.InputStream.read() to indicate end-of-file? Is the return code used to indicate an error condition, such as returning a null if a table entry can't be found

25 Apr 08

java.net: Add Logging at Class Load Time with Java Instrumentation

today.java.net/...time-with-instrumentation.html - Preview

logging java runtimeLogging ToRead

You can invoke java with a JVM argument
-javaagent:youragent.jar or
-javaagent:youragent.jar=argument to have Java call
the premain(...) method listed in the manifest of
youragent.jar before trying to run the main
method specified.
premain(...) method then allows
you to register a class file transformer with the system
class loade
6 more annotations...
- transform(...) method
- part of loading each and every
  class from here on
- before
  it is processed by the class loader into a real
  Class.
- The transform(...) method will be called for each
  class as it is being loaded. The argument is the complete, original
  byte code for the whole class.
- The premain(...) method must register the above
  transformer with the class loader. It can also handle the argument
  provided at the command line
- The MANIFEST.MF must contain a "Pre-Class: .." line
  refering to the class with the premain() method.
  Additionally, use "Boot-Class-Path:" to refer to external jar
  files

22 Apr 08

Intro to Design Patterns: Factory Method Pattern | Javalobby

java.dzone.com/...gof-design-patterns-factory-me - Preview

designPatterns java FactoryDesign

Define an interface
but let subclasses
decide which class to instantiate
13 more annotations...
- for creating an object
- ets a class defer
  instantiation to subclasses. -
- Class Creational
- bstraction through which one of several classes is
  returned
- makes use of inheritance to decide what object
  to instantiate.
- Product, ConcreteProduct, Creator, ConcreteCreator and Client.
- defines the type or interface for the concrete objects that are created by the Factory Method.
- objects of type Produc
- creator method or factory method
- verride the
  factory method in the Creator class to return the ConcreteProduct
  instance.
- oncrete factory methods
- Factory Method returns an
  instance of a class (ConcreteProduct) that is defined through an
  interface or abstract parent (Product) class.
- he method where the
  class is created returns the object through its interface or abstract
  parent class, so that the client is decoupled from the actual
  ConcreteProduct class

Intro to Design Patterns: Builder Pattern | Javalobby

java.dzone.com/...design-pattern-builder-pattern - Preview

designPatterns java builderPattern

Object Creational
simplifies the construction of complex objects
11 more annotations...
- only specifying the type and content that the object requires
- different representations of the complex object to be created by the
  different builder
- Builder, ConcreteBuilder, Director and Product.
- specifies the interface
- multiple parts that are created separately by the ConcreteBuilder objects
- hat is created by the ConcreteBuilder
- A client object creates an instance of the Director object and
  passes it the appropriate Builder object.
- he Director object invokes
  the methods on the Builder object to create and initialize specific
  parts of the Product object. The Builder receives content from the
  Director object and adds these to the Product object. The Client object
  has a reference to the Builder object and retrieves the created Product
  object from it.
- o change the
  internal representation of the complex object, a new concrete builder
  object is defined and used by the client through the Director object.
- Complex object (Product) is hidden by the
  Builder objects from the Client and Director objects
- As the client object specify the
  Builder object, it should have the knowledge how to handle the product
  object that is created by the Builder object.

25 Mar 08

Java Performance Tuning

www.javaperformancetuning.com/index.shtml - Preview

java performance tuning

20 Mar 08

java.net: Explorations: Wildcards in the Generics Specification

today.java.net/...wildcards.html - Preview

All Bookmarks ToRead generics java tutorial

ONJava.com -- Generics and Method Objects

www.onjava.com/...rmi3.html - Preview

All Bookmarks ToRead generics java tutorial

Java Tutorial: Introduction to Java Generics

www.deitel.com/...ntroductionToJavaGenerics.html - Preview

All Bookmarks ToRead generics java tutorial

java.net: Explorations: Generics, Erasure, and Bridging

today.java.net/...explorations.html - Preview

All Bookmarks ToRead generics java tutorial

java.lang.Class.getClassLoader()

msdn2.microsoft.com/...aa986317(VS.80).aspx - Preview

All Bookmarks ToRead class java loader tutorial

Tutorial:Introduction to GWT-Ext 2.0 - GWT-Ext

gwt-ext.com/...al:Introduction_to_GWT-Ext_2.0 - Preview

extjs gwt java tutorials

Ajax for Java developers: Exploring the Google Web Toolkit

www.ibm.com/...j-ajax4 - Preview

ajax good gwt ibm java tutorials

Reconstructing an externalizable object : Serialization « File Input Output « Java

www.java2s.com/...tinganexternalizableobject.htm - Preview

examples externalizable java tutorials

Introduction to Profiling Java Applications in NetBeans IDE 6.0

www.netbeans.org/...profiler-intro.html - Preview

java netbeans profiling

Introduction to the Google Web Toolkit Framework

www.netbeans.org/...quickstart-webapps-gwt.html - Preview

gwt java netbeans tutorials

Tutorials - Learn About the Ext JavaScript Library

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ajax extjs gwt java tutorials

Tutorial:Introduction to Ext 2.0 - Learn About the Ext JavaScript Library

extjs.com/...torial:Introduction_to_Ext_2.0 - Preview

extjs gwt java tutorials

Getting Started with Google Gears - I’m Mike

immike.net/...ting-started-with-google-gears - Preview

gears java tutorials

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