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java.lang.reflect.Proxy.getProxyClass() Method Example
Description
The java.lang.reflect.Proxy.getProxyClass(ClassLoader loader, Class<?>... interfaces) method returns the java.lang.Class object for a proxy class given a class loader and an array of interfaces. The proxy class will be defined by the specified class loader and will implement all of the supplied interfaces. If a proxy class for the same permutation of interfaces has already been defined by the class loader, then the existing proxy class will be returned; otherwise, a proxy class for those interfaces will be generated dynamically and defined by the class loader.
Declaration
Following is the declaration for java.lang.reflect.Proxy.getProxyClass(ClassLoader loader, Class<?>... interfaces) method.
public static Class<?> getProxyClass(ClassLoader loader, Class<?>... interfaces) throws IllegalArgumentException
Parameters
loader − the class loader to define the proxy class.
interfaces − the list of interfaces for the proxy class to implement.
Returns
a proxy class that is defined in the specified class loader and that implements the specified interfaces.
Exceptions
IllegalArgumentException − if any of the restrictions on the parameters that may be passed to getProxyClass are violated.
NullPointerException − if the interfaces array argument or any of its elements are null.
Example
The following example shows the usage of java.lang.reflect.Proxy.getProxyClass(ClassLoader loader, Class<?>... interfaces) method.
package com.tutorialspoint; import java.lang.reflect.InvocationHandler; import java.lang.reflect.InvocationTargetException; import java.lang.reflect.Method; import java.lang.reflect.Proxy; public class ProxyDemo { public static void main(String[] args) throws IllegalArgumentException, InstantiationException, IllegalAccessException, InvocationTargetException, NoSuchMethodException, SecurityException { InvocationHandler handler = new SampleInvocationHandler() ; Class proxyClass = Proxy.getProxyClass( SampleClass.class.getClassLoader(), new Class[] { SampleInterface.class }); SampleInterface proxy = (SampleInterface) proxyClass. getConstructor(new Class[] { InvocationHandler.class }). newInstance(new Object[] { handler }); proxy.showMessage(); } } class SampleInvocationHandler implements InvocationHandler { @Override public Object invoke(Object proxy, Method method, Object[] args) throws Throwable { System.out.println("Welcome to TutorialsPoint"); return null; } } interface SampleInterface { void showMessage(); } class SampleClass implements SampleInterface { public void showMessage(){ System.out.println("Hello World"); } }
Let us compile and run the above program, this will produce the following result −
Welcome to TutorialsPoint