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Class encapsulates the run-time state of an object or interface Objects of type Class are created automatically, when classes are loaded You cannot explicitly declare a Class object Generally, you obtain a Class object by calling the getClass( ) method defined by Object Some of the most commonly used methods defined by Class are shown in Table 14-13 Table 14-13 Some Methods Defined by Class
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static Class forName(String name) throws ClassNotFoundException static Class forName(String name, boolean how, ClassLoader ldr) throws ClassNotFoundException Class[ ] getClasses( )
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Returns a Class object given its complete name
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Returns a Class object given its complete name The object is loaded using the loader specified by ldr If how is true, the object is initialized; otherwise it is not (Added by Java 2)
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Returns a Class object for each of the public classes and interfaces that are members of the invoking object Returns the ClassLoader object that loaded the class or interface used to instantiate the invoking object Returns a Constructor object for all the public constructors of this class Returns a Constructor object for all the constructors that are declared by this class
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ClassLoader getClassLoader( )
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Constructor[ ] getConstructors( ) throws SecurityException Constructor[ ] getDeclaredConstructors( ) throws SecurityException Field[ ] getDeclaredFields( ) throws SecurityException
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Returns a Field object for all the fields that are declared by this class
Method[ ] getDeclaredMethods( ) Returns a Method object for all the methods that throws SecurityException are declared by this class or interface Field[ ] getFields( ) throws SecurityException Returns a Field object for all the public fields of this class
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Class[ ] getInterfaces( )
When invoked on an object, this method returns an array of the interfaces implemented by the class type of the object When invoked on an interface, this method returns an array of interfaces extended by the interface Returns a Method object for all the public methods of this class Returns the complete name of the class or interface of the invoking object Returns the protection domain associated with the invoking object (Added by Java 2) Returns the superclass of the invoking object The return value is null if the invoking object is of type Object Returns true if the invoking object is an interface Otherwise, it returns false Creates a new instance (ie, a new object) that is of the same type as the invoking object This is equivalent to using new with the class' default constructor The new object is returned Returns the string representation of the invoking object or interface
Method[ ] getMethods( ) throws SecurityException String getName( )
ProtectionDomain getProtectionDomain( ) Class getSuperclass( )
boolean isInterface( )
Object newInstance( ) throws IllegalAccessException, InstantiationException String toString( )
The methods defined by Class are often useful in situations where run-time type information about an object is required As Table 14-13 shows, methods are provided that allow you to determine additional information about a particular class, such as its public constructors, fields, and methods This is important for the Java Beans functionality, which is discussed later in this book The following program demonstrates getClass( ) (inherited from Object) and getSuperclass( ) (from Class): // Demonstrate Run-Time Type Information class X { int a; float b; } class Y extends X { double c; } class RTTI { public static void main(String args[]) { X x = new X(); Y y = new Y(); Class clObj; clObj = xgetClass(); // get Class reference Systemoutprintln("x is object of type: " +
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clObjgetName()); clObj = ygetClass(); // get Class reference Systemoutprintln("y is object of type: " + clObjgetName()); clObj = clObjgetSuperclass(); Systemoutprintln("y's superclass is " + clObjgetName());
The output from this program is shown here: x is object of type: X y is object of type: Y y's superclass is X
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