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An important aspect of reflection is its ability to instantiate objects and execute methods dynamically, at runtime For example, you can use reflection to query the capabilities of a class and then create an object of that class and execute methods on it This is a powerful capability because it enables you to write programs that use classes that are not necessarily present at compile time It is, of course, also useful when using components, such as JavaBeans This recipe shows the basic procedure needed to discover the capabilities of a class, create an instance of the class, and then call methods on that instance
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To create an object and invoke methods on it at runtime using reflection involves these steps: 1 Obtain a Class object that represents the class you want to use 2 Obtain a list of the constructors supported by the class by calling getDeclaredConstructors( ) on the Class object It returns an array of type Constructor, with each element representing one form of the constructor 3 You can determine how many and what type of parameters a constructor has by calling getParameterTypes( ) on a Constructor object 4 Using the list of constructors obtained in Step 2 and the parameter type information obtained in Step 3, create an instance of the class by calling newInstance( ) on one of the Constructor objects 5 Obtain a list of the methods supported by the class by calling getDeclaredMethods( ) on the Class object It returns an array of type Method, with each element representing one specific method 6 You can determine how many and what type of parameters a method has by calling getParameterTypes( ) on a Method object 7 You can determine the return type of a method by calling getReturnType( ) on a Method object 8 Using the list of methods obtained in Step 5, the parameter type information obtained in Step 6, and the return type obtained in Step 7, call the desired method by calling invoke( ) on the Method object
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The general procedure needed to obtain a Class object that represents a class, and to obtain a list of constructors and methods for the class, is given in Use Reflection to Obtain Information about a Class at Runtime That information is not repeated here However, recall that getDeclaredConstructors( ) returns an array of type Constructor (which represents the constructors declared by the class) and getDeclaredMethods( ) returns an array of type Method (which represents the methods declared by the class) After calling getDeclaredConstructors( ), you can determine what type and how many parameters a constructor has by calling getParameterTypes( ) on a Constructor object It is shown here: Class< >[ ] getParameterTypes( )
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It returns an array of Class objects that represent the types of the constructor s parameters The number of parameters is equal to the length of the array If the constructor has no parameters, then a zero-length array is returned To dynamically create an instance of a class, use the newInstance( ) method defined by Constructor It is shown here: T newInstance(Object arglist) throws IllegalAccessException, IllegalArgumentException, InstantiationException, InvocationTargetException This method calls the constructor whose parameter list matches the type and number of the arguments passed via arglist It returns an object of type T, which will be the class that is represented by the Class object from which the Constructor instance was obtained After calling getDeclaredMethods( ), you can determine what type and how many parameters a method has by calling getParameterTypes( ) on a Method object It is shown here: Class< >[ ] getParameterTypes( ) It returns an array of Class objects that represent the types of the method s parameters The number of parameters is equal to the length of the array If the method has no parameters, then a zero-length array is returned You can obtain a method s return type by calling getReturnType( ) on a Method object It is shown next: Class< > getReturnType( ) It returns a Class object that describes the return type of the method To call one of the methods obtained from getDeclaredMethods( ), call invoke( ) on the Method object that represents the method that you want to execute The invoke( ) method is shown here: Object invoke(Object obj, Object arglist) throws IllegalAccessException, IllegalArgumentException, InvocationTargetException The method whose argument list matches the type and number of that specified is executed The object returned by invoke( ) contains the return value of the method
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