Title: Create Proxy object - Java Code Geeks
Open Graph Title: Create Proxy object - Java Code Geeks
Description: With this example we are going to demonstrate how to create a Proxy object. A proxy is a class functioning as an interface to a network connection, a
Open Graph Description: With this example we are going to demonstrate how to create a Proxy object. A proxy is a class functioning as an interface to a network connection, a
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{"@context":"http:\/\/schema.org","@type":"Article","dateCreated":"2012-11-11T19:20:12+02:00","datePublished":"2012-11-11T19:20:12+02:00","dateModified":"2013-08-20T20:04:01+03:00","headline":"Create Proxy object","name":"Create Proxy object","keywords":"core java,reflection","url":"https:\/\/examples.javacodegeeks.com\/java-development\/core-java\/reflection\/create-proxy-object\/","description":"With this example we are going to demonstrate how to create a Proxy object. A proxy is a class functioning as an interface to a network connection, a large object in memory, a file, or some\u00a0other reso","copyrightYear":"2012","articleSection":"reflection","articleBody":"With this example we are going to demonstrate how to create a Proxy object. A proxy is a class functioning as an interface to a network connection, a large object in memory, a file, or some\u00a0other resource that is expensive or impossible to duplicate. In short, to create a Proxy object we have followed the steps below:We have created an interface, MyInterface with a method and the implementation of the interface, MyInterfaceImpl.We have created MyProxy class,that implements the InvocationHandler. It has an Object o and a constructor where it initializes\u00a0its object. It also has a method, Object invoke(Object proxy, Method m, Object[] args), that uses invoke(Object obj, Object... args) API method of Method to get the underlying method represented by this Method object, on the specified object with the specified parameters and returns this result.We create an instance of a proxy class for the specified interface that dispatches method invocations to the specified invocation handler, using newProxyInstance(ClassLoader loader, Class<?>[] interfaces, InvocationHandler h) API method of Proxy.Then we invoke the method of the object.Let\u2019s take a look at the code snippet that follows:\r\n\r\n\r\npackage com.javacodegeeks.snippets.core;\r\n\r\nimport java.lang.reflect.InvocationHandler;\r\nimport java.lang.reflect.InvocationTargetException;\r\nimport java.lang.reflect.Method;\r\nimport java.lang.reflect.Proxy;\r\n\r\npublic class CreateProxyObject {\r\n\t\r\n\tpublic static void main(String[] args) {\r\n\t\t\r\n\t\t\/\/ return an instance of a proxy class for the specified interfaces\r\n\t \/\/ that dispatches method invocations to the specified invocation handler\r\n\t\tMyInterface myintf = (MyInterface)Proxy.newProxyInstance(\r\n\t\t\t MyInterface.class.getClassLoader(),\r\n\t\t\t new Class[]{MyInterface.class},\r\n\t\t\t new MyProxy(new MyInterfaceImpl())\r\n\t\t);\r\n\r\n\t\t\/\/ Invoke the method\r\n\t\tmyintf.method();\r\n\t\t\r\n\t}\r\n\t\r\n\tprivate static interface MyInterface {\r\n\t void method();\r\n\t}\r\n\r\n\tprivate static class MyInterfaceImpl implements MyInterface {\r\n\t public void method() {\r\n\t \tSystem.out.println(\"Plain method is invoked\");\r\n\t }\r\n\t}\r\n\t\r\n\tprivate static class MyProxy implements InvocationHandler {\r\n\t \r\n\t\tObject obj;\r\n\t public MyProxy(Object o) {\r\n\t\r\n obj = o;\r\n\t }\r\n\r\n\t public Object invoke(Object proxy, Method m, Object[] args) throws Throwable {\r\n\t \t\r\n\t\r\n Object result = null;\r\n\t\r\n \r\n\t\r\n try {\r\n\t\r\n\r\nSystem.out.println(\"Proxy Class is called before method invocation\");\r\n\t\r\n\r\nresult = m.invoke(obj, args);\r\n\t\r\n }\r\n\t\r\n catch (InvocationTargetException e) {\r\n\t\r\n \tSystem.out.println(\"Invocation Target Exception: \" + e);\r\n\t\r\n }\r\n\t\r\n catch (Exception e) {\r\n\t\r\n \tSystem.out.println(\"Invocation Target Exception: \" + e);\r\n\t\r\n }\r\n\t\r\n finally {\r\n\t\r\n \tSystem.out.println(\"Proxy Class is called after method invocation\");\r\n\t\r\n }\r\n\t\r\n return result;\r\n\t\r\n \r\n\t }\r\n\t \r\n\t}\r\n\r\n}\r\n\r\n\r\nOutput:\r\n\r\nProxy Class is called before method invocation\r\nPlain method is invoked\r\nProxy Class is called after method invocation\r\n\r\n \r\nThis was an example of how to create a Proxy object in Java.","publisher":{"@id":"#Publisher","@type":"Organization","name":"Examples Java Code Geeks","logo":{"@type":"ImageObject","url":"\/wp-content\/uploads\/2013\/05\/JavaCodeGeeks-logo.png"},"sameAs":["https:\/\/feeds.feedburner.com\/examplesjavacodegeeks","https:\/\/www.facebook.com\/javacodegeeks","https:\/\/twitter.com\/javacodegeeks","https:\/\/www.linkedin.com\/groups\/3810709\/","https:\/\/www.youtube.com\/channel\/UCxoUc7Rar2q90Gu0nT2ffuQ","https:\/\/github.com\/javacodegeeks\/"]},"sourceOrganization":{"@id":"#Publisher"},"copyrightHolder":{"@id":"#Publisher"},"mainEntityOfPage":{"@type":"WebPage","@id":"https:\/\/examples.javacodegeeks.com\/java-development\/core-java\/reflection\/create-proxy-object\/","breadcrumb":{"@id":"#Breadcrumb"}},"author":{"@type":"Person","name":"Ilias Tsagklis","url":"https:\/\/examples.javacodegeeks.com\/author\/ilias-tsagklis\/"},"image":{"@type":"ImageObject","url":"https:\/\/examples.javacodegeeks.com\/wp-content\/uploads\/2012\/12\/java-logo.jpg","width":1200,"height":150}}
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| article:publisher | https://www.facebook.com/javacodegeeks |
| article:published_time | 2012-11-11T19:20:12+00:00 |
| article:modified_time | 2013-08-20T17:04:01+00:00 |
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| author | Ilias Tsagklis |
| twitter:card | summary_large_image |
| twitter:creator | @javacodegeeks |
| twitter:label1 | Written by |
| twitter:data1 | Ilias Tsagklis |
| twitter:label2 | Est. reading time |
| twitter:data2 | 2 minutes |
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