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The following example shows how to use reflection to dynamically create an object and execute methods on it Notice how class literals are used to determine at runtime the type of a parameter or return value
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// Use reflection to dynamically discover the // capabilities of a class Then, instantiate // an object of that class and call methods on it import javalangreflect*;
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// The members of this class will be reflected class MyClass { private int count; MyClass(int c) { Systemoutprintln("Executing MyClass(int)" + " Argument is " + c); count = c; } MyClass() { Systemoutprintln("Executing MyClass()"); count = 0; } void setCount(int c) { Systemoutprintln("Executing setCount(int)" + " Argument is " + c); count = c; } int getCount() { Systemoutprintln("Executing getCount()" + " Return value is " + count); return count; } void showcount() { Systemoutprintln("Executing showCount()"); Systemoutprintln("count is " + count); } } class UseReflection { public static void main(String args[]) { try { // Get a Class object that represents MyClass Class c = ClassforName("MyClass"); Systemoutprintln("Use Reflection to execute MyClass " + "constructors and methods\n"); Systemoutprintln("Create an instance of MyClass"); // Find a MyClass constructor that takes one int argument Constructor constructors[] = cgetDeclaredConstructors(); Object obj = null; for(Constructor cons : constructors) { Class[] params = consgetParameterTypes(); if(paramslength == 1 && params[0] == intclass) { obj = consnewInstance(10); break; } }
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// Make sure that an object was instantiated if(obj == null) { Systemoutprintln("Can't Create MyClass object"); return; } // Execute all methods declared by MyClass Systemoutprintln("\nExecute all MyClass methods"); // Get an array of all the methods Method methods[] = cgetDeclaredMethods(); for(Method meth : methods) { // Get the parameter type list for each method Class[] params = methgetParameterTypes(); // Execute methods based on parameters and return // values if(paramslength == 1 && params[0] == intclass) // If a method takes one int parameter, then // execute it by passing an argument of 99 methinvoke(obj, 99); else if(paramslength == 0) { if(methgetReturnType() == intclass) { // Execute a method that returns an int // and that has no parameters Object retval = methinvoke(obj); Systemoutprintln("Method returns: " + (Integer)retval); } else if(methgetReturnType() == voidclass) // Execute a void method that has no parameters methinvoke(obj); } } } catch(Exception exc) { // Handle all exceptions with a single catch In a real // application, you may want to handle the various // exceptions individually Systemoutprintln(exc); } } }
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Use Reflection to execute MyClass constructors and methods Create an instance of MyClass Executing MyClass(int) Argument is 10
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Execute all MyClass methods Executing setCount(int) Argument is 99 Executing getCount() Return value is 99 Method returns: 99 Executing showCount() count is 99
Options and Alternatives
In addition to instantiating objects and calling methods, you can get or set the value of a field by using various methods defined by Field For example, after obtaining a Field object that represents a field (which can be done by calling a method such as getDeclaredField( ) on the Class object that represents the class), you can get the value of an int field by calling getInt( ) or set the value of a double field by calling setDouble( ) You can determine the type of a field by calling getType( ) on the Field object You can obtain information about an annotation that is associated with an element, such as a class, constructor, method, and so on, by first obtaining an Annotation object that represents each annotation associated with the element This is done by calling a method such as getAnnotations( ) on the object that represents the element This method is available in these (and other) classes: Class, Constructor, Method, and Field There are many other methods available in the Constructor, Method, and Field classes that give you access to additional details For example, all define the getName( ) method, which returns the name of the method or field (Of course, for Constructor, getName( ) returns the name of the class) All also define the getModifiers( ) method, which returns the modifiers, such as private, static, and so on, applied to the element If you will be making significant use of reflection, then you will want to carefully study these methods and interfaces (and the others) declared in javalangreflect
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