#JAVA REFLECTION API HOW TO#

If a type is available but there is no instance then it is possible to obtain a Class by appending “.class” to the name of the type.It can be used for primitive data type also. Moreover, it can be used with primitives. Simple Java Reflection: API getClass() method of Object class

Let’s see the simple example of forName() method.

It should be used if you know the fully qualified name of class.This cannot be used for primitive types.

There are 3 ways to get the instance of Class class.

#JAVA REFLECTION API HOW TO#

Let us move forward with article, How to get the object of Class class? Public Method getDeclaredMethod(String name,Class parameterTypes)throws NoSuchMethodException,SecurityException Returns the total number of constructors of this class. Public Constructor getDeclaredConstructors()throws SecurityException Returns the total number of methods of this class. Public Method getDeclaredMethods()throws SecurityException Returns the total number of fields of this class. Public Field getDeclaredFields()throws SecurityException Public Object newInstance()throws InstantiationException,IllegalAccessException Loads the class and returns the reference of Class class. Public static Class forName(String className)throws ClassNotFoundException No let us take a look at Java Reflection API methods, Methods used in Modifier : This class is used to gather information about a particular access modifier.Constructor : This class is used to gather declarative information such as access modifier, name and parameter types of a constructor.Method : This class is used to gather declarative information such as access modifier, return type, name, parameter types and exception type of a method.Field : This class is used to gather declarative information such as datatype, access modifier, name and value of a variable.So what is Class in Java lang reflect package? Class in Package?įollowing is a list of various Java classes in to implement reflection. IDE (Integrated Development Environment) e.g.So let us get started with these pointers in this article on Java Reflection API Where is Java Reflection API used? Advantages and Disadvantages of Using Java Reflection API.This article will focus on following pointers: In This article we would understand Java Reflection API in detail. Java Reflection API is used to manipulate class and its members which include fields, methods, constructor, etc. Java Reflection is a process of examining or modifying the run time behavior of a class at run time.

Java reflection api