Java Reflection in Action by Ira R. Forman

By Ira R. Forman

Meant for intermediate Java programmers, this e-book offers a number of how you can produce versatile code utilizing mirrored image. The authors, who've taught a software program styles path on the college of Texas, speak about dynamic loading, dynamic proxies, classification stack introspection, the category loader, class-to-class changes, and function size concepts. instance code for an imaginary animal simulation software program corporation runs through the publication. allotted within the U.S. by means of self sustaining Publishers workforce.

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Extra info for Java Reflection in Action

Example text

If this feature is disabled, all of these methods throw a SecurityException. 1 Methods of Class for field introspection Method Description Field getField( String name) Returns a Field object that represents the specified public member field of the class or interface represented by this Class object Field[] getFields() Returns an array of Field objects that represents all the accessible public fields of the class or interface represented by this Class object Field getDeclaredField( String name ) Returns a Field object that represents the specified declared field of the class or interface represented by this Class object Field[] getDeclaredFields() Returns an array of Field objects that represents each field declared by the class or interface represented by this Class object Unfortunately, neither getFields nor getDeclaredFields provides exactly the information necessary for serialization.

In this case, metaobjects are objects that hold information about the program. Class and Method are classes whose instances represent the program. We refer to these as classes of metaobjects or metaobject classes. Metaobject classes are most of what make up Java’s reflection API. We refer to objects that are used to accomplish the main purposes of an application as base-level objects. In the setObjectColor example above, the application that calls George’s method as well as the objects passed to it as parameters are baselevel objects.

A Method object also provides the ability to call the method that it represents. For our example, we are most interested in the ability to call methods, so the rest of this section focuses on the invoke method. 1 Using dynamic invocation Dynamic invocation enables a program to call a method on an object at runtime without specifying which method at compile time. 2, George does not know which setColor method to call when he writes the program. His program relies upon introspection to examine the class of a parameter, obj, at runtime to find the right method.

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