#JAVA REFLECTION TUTORIAL HOW TO#
#JAVA REFLECTION TUTORIAL FULL#
#JAVA REFLECTION TUTORIAL ANDROID#
#JAVA REFLECTION TUTORIAL CODE#

Reflection Example: The Class.forName() method returns the Class object associated with the class/interface with the given name(a string and full qualified name). Introspection Example: The instanceof operator determines whether an object belongs to a particular class.

#JAVA REFLECTION TUTORIAL CODE#

Let us see simple code snippets about the two concepts as below. Reflection is the ability of a program to examine and modify the structure and behavior of an object at runtime. Introspection is the ability of a program to examine the type or properties of an object at runtime. Now let us see the definitions of “Reflection” & “Introspection”.

“Reflection is commonly used by programs which require the ability to examine or modify the runtime behavior of applications running in the Java virtual machine.” This concept is often mixed with introspection. Here in this tutorial i am going to focus little bit on Java’s one of the powerful concept called “Reflection”.

#JAVA REFLECTION TUTORIAL ANDROID#

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#JAVA REFLECTION TUTORIAL HOW TO#

This trail uses a task-oriented approach to theĮach lesson includes a set of related tasks,Īnd every task is explained, step by step,Įxplains how to determine the class of an object,Īnd how to get information about classes and interfaces. The reflection API, this trail uses the term 'field.' Other trails use the term 'member variable'

You should define an interface, and then implement it Your program will be easier to debug and maintain if you Language, you might be tempted to use the Method objects When other tools more natural to the Java programming languageįor example, if you are in the habit of using function pointers in another Invoke a method on an object, even if the method is not known until runtime.Ĭreate a new array, whose size and component type are not known until runtime, and then modify the array's components. Get and set the value of an object's field, Get information about a class's modifiers, fields, methods, constructors, andįind out what constants and method declarations belong to an interface.Ĭreate an instance of a class whose name is not known until runtime. Such as debuggers, class browsers, and GUI builders. You'll want to use the reflection API if you are writing development tools The reflection API represents, or reflects, the classes, interfaces, Your feedback is important to us! If you have comments about this trail, send them to: In your message, put reflection in the subject header.

Java reflection tutorial