Java Reference
In-Depth Information
Chapter2 referredto reflection (alsoknownas introspection )asathirdformofruntime
type identification (RTTI). Java's Reflection API lets applications learn about loaded
methods, access fields, call methods, and perform other tasks reflectively.
Chapter3 presenteda StubFinder applicationthatusedpartoftheReflectionAPI
to load a class and identify all the loaded class's public methods that are annotated
with @Stub annotations.Thistoolisoneexamplewhereusingreflectionisbeneficial.
Another example is the class browser , a tool that enumerates the members of a class.
Caution Reflection should not be used indiscriminately. Application performance
time type checking can result in runtime failures.
The java.lang package's Class classistheentrypointintotheReflectionAPI,
whosetypesaremainlystoredinthe java.lang.reflect package. Class isgen-
erically declared as Class<T> , where T identifies the class, interface, enum, or an-
notationtypethatisbeingmodeledbythe Class object. T canbereplacedby ? (asin
Class<?> ) when the type being modeled is unknown.
Table 4-3 describes some of Class 's methods.
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