"Go" "Java" using reflection technology, to implement the private method of the class, variable access

Java's package of reflection mechanisms is mainly in java.lang.reflect, and structs,hibernate,spring frameworks are based on the reflection mechanism of java.

Here is a simple example of using Java's reflection mechanism to access private properties and private methods, and hopefully it will help you.

ImportJava.lang.reflect.Field;ImportJava.lang.reflect.Method;Importjava.util.ArrayList; Public classPerson {PrivateString name;//Private Properties     PublicString address;  PublicPerson (String name) { This. name=name; }               Private voidSetaddress (String address) {//Private Methods         This. address=address; }                Public Static voidMain (string[] args) {Try{ person person=NewPerson ("Zhangsan"); Class<Person> Cls=person.class; //Get Private methodsMethod Method=cls.getdeclaredmethod ("Setaddress",NewClass[]{string.class}); //setting private methods can be accessedMethod.setaccessible (true); //Calling Private MethodsMethod.invoke (Person,Newobject[]{"BJUT"}); System.out.println (person.address);//Output Bjut//Accessing private variablesField Field=cls.getdeclaredfield ("name"); Field.setaccessible (true); Field.set (person,"Test China"); System.out.println (Field.get (person));//Output ZhangsanArrayList<String> test =NewArraylist<string> (1000); Class<ArrayList> tcls = ArrayList.class; Field= Tcls.getdeclaredfield ("Size"); Field.setaccessible (true); Field.set (Test,100);                         System.out.println (Field.get (test));                     System.out.println (Test.size ()); }Catch(Exception ex) {ex.printstacktrace (); }                }          Public classTest {PrivateString name;//Private Properties    } }

From: http://zc0604.iteye.com/blog/1168859

"Go" "Java" using reflection technology, to implement the private method of the class, variable access