Invoke() : We use the method to invoke / execute a class method at runtime– Method.invoke(Object, parameter) ParameterType - parameter is an array of Class objects MethodName- the name of method whose object is to be created For this method, the syntax is Class.getDeclaredMethod(methodName, parameterType) GetDeclaredMethod () : Creating a method object to be invoked. We are using two methods below for this purpose: We can call / execute any technique / method by reflecting whether we recognize its procedure name and its parameter types.Important observations based on above java program : The name of constructor is ReflectionTest Output: The name of class is ReflectionTest Method myMethodcall3 = cls.getDeclaredMethod('myMethod3') Method myMethodcall2 = cls.getDeclaredMethod('myMethod1')

Method methodcall1 = cls.getDeclaredMethod('myMethod2', ('The name of class is ' +Ĭonstructor constructor = m圜ls.getConstructor() ReflectionTestreflectionTest= new ReflectionTest() Public static void main(String args) throws Exception The Reflection package required, the '' package, allows us to invoke methods, regardless of the access modifier, at runtime. // Below program to show the use of reflection in java import import import class ReflectionTest Java's Reflection API is used to control class and its members at runtime, including fields, methods, constructor. Reflection is an API for evaluating or altering the behavior of runtime methods, classes and interfaces. The best surfaces for reflecting light are very smooth, such as a glass mirror or polished metal, although almost all surfaces will reflect light to some degree.Java Tutorial By KnowledgeHut REFLECTION IN JAVA Java Reflection is the method of evaluation and adjustment at runtime of all the capabilities of a class. It is important to note that the light is not separated into its component colors because it is not being 'bent' or refracted, and all wavelengths are being reflected at equal angles. This concept is often termed the Law of Reflection. Thus, the angle of incidence is equal to the angle of reflection for visible light as well as for all other wavelengths of the electromagnetic radiation spectrum. Visible white light that is directed onto the surface of a mirror at an angle (incident) is reflected back into space by the mirror surface at another angle (reflected) that is equal to the incident angle, as presented in the tutorial for the action of a sinusoidal light wave on a smooth, flat mirror. When light reflects from a smooth surface, the incoming light wave is referred to as an incident wave, and the wave that is bounced away from the surface is termed the reflected wave. Beneath the sliders, the mathematics involved in calculating the angle of the reflected wave is reviewed for each incident and reflected angle as the Incident Angle slider is adjusted. The Wavelength and Incident Angle sliders can be utilized to adjust these parameters of the wave, which will be immediately executed in the tutorial. The incident light is reflected from the surface according to the Law of Refraction and leaves with the same angle at which it arrives. The tutorial initializes with a red sinusoidal wave incident on a smooth, mirrored surface at an angle of 40 degrees. This tutorial explores the incident and reflected angles of a single light wave impacting on a smooth surface. Reflection of light (and other forms of electromagnetic radiation) occurs when the waves encounter a surface or other boundary that does not absorb the energy of the radiation and bounces the waves away from the surface.

Java reflection tutorial for beginners