By Ira R. Forman
Meant for intermediate Java programmers, this e-book provides numerous how one can produce versatile code utilizing mirrored image. The authors, who've taught a software program styles direction on the college of Texas, speak about dynamic loading, dynamic proxies, classification stack introspection, the category loader, class-to-class ameliorations, and function size strategies. instance code for an imaginary animal simulation software program corporation runs in the course of the booklet. allotted within the U.S. via self reliant Publishers team.
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Extra resources for Java Reflection in Action
Class has other methods for introspecting about methods. 1. As in the previous example, the queries use an array of Class to indicate the types of the parameters. 1 The methods defined by Class for method query Method Description Method getMethod ( String name, Class parameterTypes ) Returns a Method object that represents a public method (either declared or inherited) of the target Class object with the signature specified by the second parameters Method getMethods () Returns an array of Method objects that represent all of the public methods (either declared or inherited) supported by the target Class object Method getDeclaredMethod ( String name, Class parameterTypes ) Returns a Method object that represents a declared method of the target Class object with the signature specified by the second parameters Method getDeclaredMethods () Returns an array of Method objects that represent all of the methods declared by the target Class object 12 CHAPTER 1 A few basics querying for a parameterless method, it is legal to supply null, which is treated the same as a zero-length array.
4 This is a Unified Modeling Language (UML) diagram describing Dolly the cloned sheep. The diagram shows an object, dolly, which is an instance of the class Sheep. It describes Sheep as a Mammal that implements Cloneable. The important thing to notice about this diagram is that it includes both objects and classes, as is necessary for describing reflective systems. 1 for a while, one of his team members, Martha, runs into a problem. Martha tells George that setObjectColor is not seeing a setColor method inherited by her component.
Supplying an args array of incorrect length or with entries of the wrong type also causes an IllegalArgumentException. If any exception is thrown by the method being invoked, that exception is wrapped in an InvocationTargetException and then thrown. Dynamic invocation is a truly important feature in Java reflection. 1. In later chapters, we return to dynamic invocation for more advanced applications and expose other powerful ways to use information gained through introspection. 4. 4 combines UML class and object diagrams.