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Frank AppiahSoftware Developer

SWGlobal Ltd

J2SE 5

http://frankappiahnsiah.wordpress.com

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IntroductionJava Buzzwords Simple Secure Portable Object-oriented Distributed Robust Multithreaded

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J2SE LanguageThis is the fundamental of the other two

languages/platforms.It consist of JDBC, Swing, RMI etc.

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Topics to discussWhat is new in J2SE 5 ? - Generics - Annotations - Enumerations - Auto boxing - Variable Length Argument Additional : ReflectionsGUI Programming in JAVA - Swing - SwingX >Extension of Swing :

http://www.swinglabs.org - Flamingo

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GenericsIt enable you to create classes, interfaces,

and methods in which the type of data upon which they operate is specified as parameter.

Merit It automatically work with the type of data

passed to its parameter.

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Simple Example Generic with a single parameter public class Indexer<T> { T entity;public Indexer(T entity){ this.entity=entity;}public void index(){ //implement code.}public T getEntity(){ return this.entity;} } Generics also support two type parameters Support for wildcard arguments ?

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Bounded Parameter public class Indexer<T implements Serializable> { T entity;public Indexer(T entity){ this.entity=entity;}public void index(){ //implement code.}public T getEntity(){ return this.entity;} }

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EnumerationIt offers elegant, structured solution to a

variety of programming task. public enum color{red, green, yellow, blue}

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What can enumeration do for me?Clearity/Readability of codeReusing of constant values

Example : Modelling a traffic light with enumeration

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TrafficLightColor enum TrafficLightColor { RED, GREEN, YELLOW }

The color of lights modelled with enumeration.

TrafficLightSimulator class TrafficLightSimulator implements Runnable { boolean stop=false; private TrafficLightSimulator tlc; Thread thread; TrafficLightSimulator(TrafficLightColor init){ tlc=init; thread=new Thread(this); thread.start();} public void run { //if stop is not true, check color

in a switch statement and wait for some time then change color.}

}

Reflection : java.lang.reflect.*MethodParameterFieldModifierClass

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What can reflection do for me?Externalizing of configuration classes.More Decoupling

Frameworks like Spring, Seam and Web Beans (EJB 3.1) uses this feature a

lot.

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Annotations : java.lang.annotationAnnotations in J2SE 5 for documentations. @Deprecated @version : Indicating the version of code @author : To show the developer’s name

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What can annotations do for me?Adding stereotype to classes to add

additional functionalityBetter maintainability

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Creating a simple annotation@Retention(RetentionPolicy.RUNTIME)@Target(ElementType.TYPE)public @interface Model { String name() default "model";}

@Retention(Runtime) : allow your annotation to be visible at runtime.

@Target(Type) : can be applied on classes only.

Using the @Model annotation @Model(name=“student”) public class Student { String firstname; String lastname;} In order to make use of annotation

meaningfully, you have write your own custom code.

It is not exhausted here

AutoboxingConvert a primitive type into its equivalent

wrapper Example : int intobj=100;Integer value=intobj;

Auto-unboxing : Convert a wrapper into its equivalent primitive

type.

Example : Integer intObj=1000; int value=intObj

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Flamingo Application menu button and application menu Application title bar Resize and resize sequencing policies Scrolling shrinked ribbon content Rich tooltips Key tips Ribbon minimized mode Visual groups in ribbon bands Ribbon flow bands Hosting core Swing components in ribbon Rich popup panels Ribbon help button A03 plugin for Flamingo High fidelity Substance skins Polished command button strip visuals Control over command button gap scaling

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Further Reading http://java.net.dev : SwingX, Swinghttp://www.swinglabs.org : SwingXhttp://www.pushing-pixels.org: Flamingohttp://frankappiahnsiah.wordpress.com :

SwingX

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Questions ?

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