Android (Java) Learning Note: 109: Get member variables by reflection and use

1  Packagecn.itcast_03;2 3 ImportJava.lang.reflect.Constructor;4 ImportJava.lang.reflect.Field;5 6 /*7 * Get member variables by occurrence and use8  */9  Public classReflectdemo {Ten      Public Static voidMain (string[] args)throwsException { One         //Get bytecode File object AClass C = class.forname ("Cn.itcast_01.Person"); -  -         //get all the member variables the         //field[] fields = C.getfields (); -         //field[] fields = C.getdeclaredfields (); -         //For (Field field:fields) { -         //System.out.println (field); +         // } -  +         /* A * Person p = new person (); p.address = "Beijing"; SYSTEM.OUT.PRINTLN (p); at          */ -  -         //creating an object from a parameterless construction method -Constructor con =c.getconstructor (); -Object obj =con.newinstance (); - System.out.println (obj); in  -         //to get a single member variable to         //get address and assign value to it +Field Addressfield = C.getfield ("Address"); -         //Public void Set (Object obj,object value) the         //sets the field that is represented by this field object on the specified object variable to the specified new value.  *Addressfield.set (obj, "Beijing");//set the value for the Addressfield field of the Obj object to "Beijing" $ System.out.println (obj);Panax Notoginseng  -         //get the name and assign a value to it the         //nosuchfieldexception +Field NameField = C.getdeclaredfield ("name"); A         //illegalaccessexception theNamefield.setaccessible (true); +Namefield.set (obj, "Brigitte"); - System.out.println (obj); $  $         //get age and assign a value to it -Field Agefield = C.getdeclaredfield ("Age"); -Agefield.setaccessible (true); theAgefield.set (obj, 27); - System.out.println (obj);Wuyi     } the}

Android (Java) Learning Note: 109: Get member variables by reflection and use