René's URL Explorer Experiment

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{"@context":"http:\/\/schema.org","@type":"Article","dateCreated":"2012-11-11T19:35:44+02:00","datePublished":"2012-11-11T19:35:44+02:00","dateModified":"2012-11-11T19:35:44+02:00","headline":"MethodHandle example","name":"MethodHandle example","keywords":"core java,lang","url":"https:\/\/examples.javacodegeeks.com\/java-development\/core-java\/lang\/methodhandle-example\/","description":"public class MethodAccessExampleWithArgs { private final int i; public MethodAccessExampleWithArgs(int i_) { i = i_; } private void bar(int j, String msg) { System.out.println(\"Private Method 'bar' su","copyrightYear":"2012","articleSection":"lang","articleBody":"\n\n\n\n\npublic class MethodAccessExampleWithArgs {\n private final int i;\n \n public MethodAccessExampleWithArgs(int i_) {\n  i = i_;\n }\n \n private void bar(int j, String msg) {\n  System.out.println(\"Private Method 'bar' successfully accessed : \"\n    + i + \", \" + j + \" : \" + msg + \"!\");\n }\n \n \/\/ Using Reflection\n public static Method makeMethod() {\n  Method meth = null;\n \n  try {\n   Class[] argTypes = new Class[] { int.class, String.class };\n \n   meth = MethodAccessExampleWithArgs.class.getDeclaredMethod(\"bar\",\n     argTypes);\n \n   meth.setAccessible(true);\n  } catch (IllegalArgumentException e) {\n   e.printStackTrace();\n  } catch (NoSuchMethodException e) {\n   e.printStackTrace();\n  } catch (SecurityException e) {\n   e.printStackTrace();\n  }\n \n  return meth;\n }\n \n \/\/ Using method handles\n public static MethodHandle makeMh() {\n  MethodHandle mh;\n \n  MethodType desc = MethodType.methodType(void.class, int.class,\n    String.class);\n \n  try {\n   mh = MethodHandles.lookup().findVirtual(\n     MethodAccessExampleWithArgs.class, \"bar\", desc);\n   System.out.println(\"mh=\" + mh);\n  } catch (NoAccessException e) {\n   throw (AssertionError) new AssertionError().initCause(e);\n  }\n  return mh;\n }\n}\nFollowing, is a class meant to test the two approaches of accessing the private method “bar” : \npublic class MethodAccessMain {\n \n private static void withReflectionArgs() {\n  Method meth = MethodAccessExampleWithArgs.makeMethod();\n \n  MethodAccessExampleWithArgs mh0 = new MethodAccessExampleWithArgs(0);\n  MethodAccessExampleWithArgs mh1 = new MethodAccessExampleWithArgs(1);\n \n  try {\n   System.out.println(\"Invocation using Reflection\");\n   meth.invoke(mh0, 5, \"Jabba the Hutt\");\n   meth.invoke(mh1, 7, \"Boba Fett\");\n  } catch (IllegalAccessException e) {\n   e.printStackTrace();\n  } catch (IllegalArgumentException e) {\n   e.printStackTrace();\n  } catch (InvocationTargetException e) {\n   e.printStackTrace();\n  }\n }\n \n private static void withMhArgs() {\n  MethodHandle mh = MethodAccessExampleWithArgs.makeMh();\n \n  MethodAccessExampleWithArgs mh0 = new MethodAccessExampleWithArgs(0);\n  MethodAccessExampleWithArgs mh1 = new MethodAccessExampleWithArgs(1);\n \n  try {\n   System.out.println(\"Invocation using Method Handle\");\n   mh.invokeExact(mh0, 42, \"R2D2\");\n   mh.invokeExact(mh1, 43, \"C3PO\");\n  } catch (Throwable e) {\n   e.printStackTrace();\n  }\n }\n \n public static void main(String[] args) {\n  withReflectionArgs();\n  withMhArgs();\n }\n}\n\nRelated Article: \n \n  \n  A glimpse at Java 7 MethodHandle and its usage \n  \n\nReferences : \nA glimpse at MethodHandle and its usage from our JCG partners at Java 7 Developer Blog \nThe Well-Grounded Java Developer \n\n\n","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\/lang\/methodhandle-example\/","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}}