java reflect反射机制（java reflect反射机制）.docVIP

java reflect反射机制（java reflect反射机制） In the Object class, the following methods are defined that are inherited by all subclasses: public, final, Class, getClass (); The Class class is the source of the Java reflection. You can find the name of the class by object reflection. There are three ways to instantiate a Class class object 1, through the Class.forName () method; Such as: Class, C = Class.forName (com.dwtia.case.Login); The most common method of development 2, class.Class; Such as: Class, C = Login.class; 3, object.GetClass (); Such as: Class, C = new, Login (),.GetClass (); Reflective applications 1. Generate objects Public, static, void, main (String[], args) { Class C = null; {try C = Class.forName (com.reflect.Person); } catch (ClassNotFoundException, e) { E.printStackTrace (); } //====================================== Constructor []cons = c.getConstructors (); {try No / / construction method; / / if there is, there must be an empty construction method; Person P = (Person) c.newInstance (); P.setName (Qin River); P.setAge (28); System.out.println (P); According to the construction method of / Person, P2 = (Person) cons[0].newInstance (dwtia, 30); System.out.println (P2); } catch (Exception, e) { E.printStackTrace (); } //====================================== {try No / / construction method; / / if there is, there must be an empty construction method; Constructor con = c.getConstructor (new, Class[]{}); Person P = (Person) con.newInstance (new, Object[]{}); P.setName (Qin River); P.setAge (28); System.out.println (P); According to the construction method of / Constructor CON1 = c.getConstructor (new, Class[]{String.class, int.class}); Person, P1 = (Person) con1.newInstance (new, Object[]{, dwtia, 30}); System.out.println (P1); } catch (Exception, e) { E.printStackTrace (); } } 2, call the class method Public, static, void, main (String[], args) { {try Class C = Class.forName (com.reflect.Person); / / method call no parameters Method M1 = c.getMethod (say