Reflection in java

Using Java™ Technology Reflection to Improve Design

Agenda ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

What Is Reflection ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

What Is Reflection ,[object Object],[object Object],1. J. R. Jackson, A. L. McClellan, Java™ 1.2 By Example, Sun Microsystems, 1999. 2. M. Campione, et al, The Java™ Tutorial Continued, Addison Wesley, 1999.

The History of Reflection ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Why Runtime Class Identification ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Runtime Class Identification Example Code ,[object Object],[object Object],[object Object]

How the Class Object Works ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Proof of Dynamic Loading public static void main (String[] args) { System.out.println ("inside main"); new A (); System.out.println ("After creating A"); try { Class.forName ("B"); } catch (ClassNotFoundException e) { e.printStackTrace (); } System.out.println ("After forName (amp;quot;Bamp;quot;)"); new C (); System.out.println ("After creating C"); }

Late Dynamic Binding ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Class Literals ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

The instanceof Keyword ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

The Reflection API ,[object Object],[object Object],[object Object],[object Object],[object Object]

Core Reflection Classes ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Core Reflection Classes (Cont.) ,[object Object],[object Object],[object Object],[object Object]

Core Reflection Classes (Cont.) ,[object Object],[object Object],[object Object]

Core Reflection Classes (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Core Reflection Classes (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Commonly Used Classes ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Using Reflection ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

What Can I Do With Reflection ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Here Is How To… ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Here Is How To… ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Here Is How To… ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Here Is How To… ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Four Myths of Reflection ,[object Object],[object Object],[object Object],[object Object]

“Reflection Is Only Useful for JavaBeans™ Technology-based Components” ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

“Reflection Is Too Complex for Use in General Applications” ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

“Reflection Reduces the Performance of Applications” ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

“Reflection Cannot Be Used With the 100% Pure Java™ Certification Standard” ,[object Object],[object Object],[object Object],3. Sun Microsystems, 100% Pure Java™ Certification Guide, version 3.1, May 2000.

Advanced Reflection Issues ,[object Object],[object Object],[object Object],[object Object],[object Object]

Why Use Reflection ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Use Reflection With Design Patterns ,[object Object],[object Object],[object Object],[object Object]

Design Patterns and Reflection ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Design Pattern Implications ,[object Object],[object Object],[object Object],[object Object]

Design Strategies for Using Reflection ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Challenge UI Listeners ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Improvements to Reflection in JDK™ 1.2 Release ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Improvements to Reflection in JDK™ 1.3 Release ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Capabilities Not Available Using Reflection ,[object Object],[object Object],[object Object],[object Object],[object Object]

Review ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Benefits of Reflection ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Reflection in java

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Reflection in java