Parent class is a subclass of a generic class that inherits the parent class

Implementation: The parent class is a generic class, the subclass inherits the parent class,
This allows the generic object to be obtained in the parent class. is the generic type that is set when the subclass inherits the parent class.




If, for example, it is under a COM package
The parent class is: public class person<t>
Subclass: public class Student extends person<student>


Getsuperclass () Gets the parent class of the class: Com. Person
Getgenericsuperclass () Gets the parent class (if there is generics, also bring the generics): COM. Person<com. Student>


Getgenericsuperclass () If the parent class is not a class with a generic type. The result returned is the same as Getsuperclass ().


Gets the generic parameter type.


This.getclass (). Getgenericsuperclass () Gets the parent class (if there is a generic, gets the parent class with the generic type)


((Parameterizedtype) This.getclass (). Getgenericsuperclass ()). Getactualtypearguments () [0] Gets the first parameter type of a generic parameter




Getactualtypearguments () The method is to get a generic type array, [0] to get the first value




===================== Example: ======================
Parent class:
public class Dao<t> {

Private class<t> entity;


/**
*
*/
Public Dao () {
Super ();
TODO auto-generated Constructor stub
System.out.println ("Class:" +this.getclass ());
Entity= (class<t>) ((Parameterizedtype) This.getclass (). Getgenericsuperclass ()). Getactualtypearguments () [0] ;
System.out.println (Entity.getname ());
}

Public class<t> getentity () {
return entity;
}
}


Sub-class:
public class Userdao extends dao<user>{


public void Test1 () {
System.out.println ("Name:" +this.getentity (). GetName ());
}
}


JavaBean
public class User {


String name;
String ID;
}


Test:
public class Testmain {


public static void Main (string[] args) {
Userdao dao=new Userdao ();
Dao.test1 ();
}
}
===================== Example: ======================