Java Reflection Call Demo

Base class. For demo reflex Exercises

1  PackageFanshe;2 3  Public classPerson {4      PublicString name;5     PrivateString age;6     Private intp;7      PublicPerson () {};8      PublicPerson (string name, String age) {9         Super();Ten          This. Name =name; One          This. Age =Age ; A     } -     PrivatePerson (string name, String age,intp) { -         Super(); the          This. Name =name; -          This. Age =Age ; -          This. P =p; -     } +      PublicString GetName () { -         returnname; +     } A @Override at      PublicString toString () { -         return"Person [name=" + name + ", age=" + Age + "]" + "P-" +p; -     } -      Public voidsetName (String name) { -          This. Name =name; -     } in      PublicString getage () { -         returnAge ; to     } +      Public voidsetage (String age) { -          This. Age =Age ; the     } *}

Reflection Demo Class

1  PackageFanshe;2 3 ImportJava.lang.reflect.Constructor;4 ImportJava.lang.reflect.Field;5 Importjava.lang.reflect.InvocationTargetException;6 ImportJava.lang.reflect.Method;7 8  Public classDemo1 {9 Ten      Public Static voidMain (string[] args) { One         //TODO auto-generated Method Stub A         Try { - d_3 (); -}Catch(Exception e) { the             //Todo:handle Exception - e.printstacktrace (); -         } -     } +      -     Private Static voidd_1 () { +Person p =NewPerson (); AClass C =P.getclass (); at      -     } -      -     Private Static voidd_2 () { -Class C = person.class; - System.out.println (c); in     } -     Private Static voidD_3 ()throwsclassnotfoundexception, Nosuchmethodexception, SecurityException, Instantiationexception, Illegalaccessexception, IllegalArgumentException, InvocationTargetException, nosuchfieldexception { toClass C = Class.forName ("Fanshe. Person "); +          -         //--------------------------// theConstructor con = c.getconstructor ();//constructor public to get null arguments *Object o= con.newinstance ();//How to run the obtained constructor $ System.out.println (o.tostring ());Panax Notoginseng          -         //--------------------------// theConstructor Con2 = C.getconstructor (String.class, String.class);//to get a constructor with parameters public +Object O2 = (person) con2.newinstance ("A", "22"); A System.out.println (o2.tostring ()); the          +         //--------------------------// -          $Constructor Con3 = C.getdeclaredconstructor (String.class, String.class,int.class);//get a constructor with parameters private $Con3.setaccessible (true); -Object O3 = (person) con3.newinstance ("A", "22", 14); - System.out.println (o3.tostring ()); the          -         //--------------------------//WuyiObject tmp_obj =c.newinstance (); theField f_name = C.getfield ("name");//GET member variable public -F_name.set (Tmp_obj, "abc");//Setting Variables Wu System.out.println (tmp_obj); -          About         //--------------------------// $Field f_age = C.getdeclaredfield ("Age");//GET member variable public - System.out.println (f_age); -          -         //--------------------------// AMethod m_getname = C.getmethod ("GetName");//Get class function no parameter public +Object O1 = M_getname.invoke (tmp_obj);//run the GetName method. Return value back to obj the System.out.println (O1); -          $         //--------------------------// theMethod m_setname = C.getmethod ("SetName", String.class); theM_setname.invoke (Tmp_obj, "Abcdqweqwe"); the System.out.println (tmp_obj.tostring ()); the     } -}

by reflection. Bypass Generics

1arraylist<string> arr =NewArraylist<string>();2Arr.add ("a");3Class Carr =Arr.getclass ();4Method Arr_add = Carr.getmethod ("Add", Object.class);5Arr_add.invoke (arr, 1);6Arr_add.invoke (arr, 2);7Arr_add.invoke (arr, 3);8Arr_add.invoke (arr, 4);9System.out.println (arr);

Java Reflection Call Demo