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The first step when using reflection is to obtain a Class object that represents the class in question One way to obtain this object is to call the static method forName( ) This method is defined by javalangClass and returns a Class object given the name of the class It is shown here: static Class<set> forName(String name) throws ClassNotFoundException The name of the class (which must be fully qualified with its package name) is specified by name A Class object representing the class is returned If the class is not found, a ClassNotFoundException is thrown Given a Class object, you can obtain information about the class that it represents
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NOTE You can also use forName( ) to obtain a Class object that represents an interface and
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reflection can be used to obtain information about that interface at runtime The same basic techniques apply However, the focus of this recipe is on obtaining information about a class To obtain an array that describes the constructors defined by the class, call getDeclaredConstructors( ) on the Class object It is shown here: Constructor< >[ ] getDeclaredConstructors( ) throws SecurityException It returns an array of Constructor objects that encapsulate information about each constructor defined by the class This also includes the default constructor (Be aware that if you call getDeclaredConstructors( ) on a Class object that represents an interface, array, primitive type, or void, a zero-length array is returned) To obtain an array that describes the methods of the class, call getDeclaredMethods( ), shown here: Method[ ] getDeclaredMethods( ) throws SecurityException It returns an array of Method objects that encapsulate information about each method defined by the class If there are no methods, a zero-length array is returned
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To obtain an array that describes the fields of the class, call getDeclaredFields( ), shown here: Field[ ] getDeclaredFields( ) throws SecurityException It returns an array of Field objects that encapsulate information about each field declared by the class If the class has no fields, a zero-length array is returned The Constructor, Method, and Field classes are packaged in javalangreflect, and they encapsulate information about a constructor, method, and field, respectively An easy way to display this information is to call the toString( ) method defined by each of these classes (Recall that toString( ) is called automatically when you output to the console via println( ), for example) This is the approach used by this recipe
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The following program illustrates the basic mechanism used to obtain information about a class at runtime through the use of reflection It creates a class called MyClass and then uses reflection to display information about its constructors, methods, and fields
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// Demonstrate reflection basics import javalangreflect*; // The members of this class will be reflected class MyClass { private int count; MyClass(int c) { count = c; } MyClass() { count = 0; } void setCount(int c) { count = c; } int getCount() { return count; } void showcount() { Systemoutprintln("count is " + count); } } class ReflectionDemo { public static void main(String args[]) { try { // Get a Class object that represents MyClass
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Class c = ClassforName("MyClass"); Systemoutprintln("Reflecting MyClass\n"); // Obtain and display information about // the constructors, methods, and fields // declared by MyClass Systemoutprintln("Constructors:"); Constructor constructors[] = cgetDeclaredConstructors(); for(Constructor cons : constructors) Systemoutprintln(" " + cons); Systemoutprintln("\nMethods:"); Method methods[] = cgetDeclaredMethods(); for(Method meth : methods) Systemoutprintln(" " + meth); Systemoutprintln("\nFields:"); Field fields[] = cgetDeclaredFields(); for(Field fld : fields) Systemoutprintln(" " + fld); } 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); } } }
The output is shown here:
Reflecting MyClass Constructors: MyClass() MyClass(int) Methods: void MyClasssetCount(int) int MyClassgetCount() void MyClassshowcount() Fields: private int MyClasscount
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