Summary of Classes

The following table summarizes the classes that comprise the reflection API. The Class and Object classes are in the java.lang package. The other classes are contained in the java.lang.reflect package.

Class	Description
Array	Provides static methods to dynamically create and access arrays.
Class	Represents, or reflects, classes and interfaces.
Constructor	Provides information about, and access to, a constructor for a class. Allows you to instantiate a class dynamically.
Field	Provides information about, and dynamic access to, a field of a class or an interface.
Method	Provides information about, and access to, a single method on a class or interface. Allows you to invoke the method dynamically.
Modifier	Provides static methods and constants that allow you to get information about the access modifiers of a class and its members.
Object	Provides the getClass method.

So on the class basis:
For each of these three types of class components -- constructors, fields, and methods -- see here for more--http://www.ibm.com/developerworks/library/j-dyn0603/