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java.lang.reflect.Proxy.newProxyInstance() Method Example
Description
The java.lang.reflect.Proxy.newProxyInstance(ClassLoader loader, Class<?>[] interfaces, InvocationHandler h) method returns an instance of a proxy class for the specified interfaces that dispatches method invocations to the specified invocation handler.
Declaration
Following is the declaration for java.lang.reflect.Proxy.newProxyInstance(ClassLoader loader, Class<?>[] interfaces, InvocationHandler h) method.
public static Object newProxyInstance(ClassLoader loader, Class<?>[] interfaces, InvocationHandler h) throws IllegalArgumentException
Parameters
loader − the class loader to define the proxy class.
interfaces − the list of interfaces for the proxy class to implement.
h − the invocation handler to dispatch method invocations to.
Returns
A proxy instance with the specified invocation handler of a proxy class that is defined by 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, or if the invocation handler, h, is null.
Example
The following example shows the usage of java.lang.reflect.Proxy.newProxyInstance(ClassLoader loader, Class<?>[] interfaces, InvocationHandler h) method.
package com.tutorialspoint; import java.lang.reflect.InvocationHandler; import java.lang.reflect.Method; import java.lang.reflect.Proxy; public class ProxyDemo { public static void main(String[] args) throws IllegalArgumentException { InvocationHandler handler = new SampleInvocationHandler() ; SampleInterface proxy = (SampleInterface) Proxy.newProxyInstance( SampleInterface.class.getClassLoader(), new Class[] { SampleInterface.class }, handler); Class invocationHandler = Proxy.getInvocationHandler(proxy).getClass(); System.out.println(invocationHandler.getName()); } } 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 −
com.tutorialspoint.SampleInvocationHandler