Dynamically converting java object of Object class to a given class when class name is known

Question

Yeah  I know  Long title of question    So I have class name in string  I m dynamically creating object of that class in this way     String className    com package MyClass      Class c   Class forName className   Object obj   c newInstance      How I can dynamically convert that obj to MyClass object  I can t write this way   MyClass mobj    MyClass obj       because className can be different

User · Answer

SuppressWarnings  unchecked   private static  lt T extends Object gt  T cast Object obj        return  T  obj

User · Answer

If you didnt know that mojb is of type MyClass  then how can you create that variable   If MyClass is an interface type  or a super type  then there is no need to do a cast

User · Answer

You don t have to convert the object to a MyClass object because it already is  Wnat you really want to do is to cast it  but since the class name is not known at compile time  you can t do that  since you can t declare a variable of that class  My guess is that you want need something like  duck typing   i e  you don t know the class name but you know the method name at compile time  Interfaces  as proposed by Gregory  are your best bet to do that

User · Answer

you don t  declare an interface that declares the methods you would like to call   public interface MyInterface     void doStuff       public class MyClass implements MyInterface     public void doStuff           System Console Writeln  done             then you use  MyInterface mobj    myInterface obj  mobj doStuff      If MyClassis not under your control then you can t make it implement some interface  and the other option is to rely on reflection  see this tutorial

User · Answer

I think its pretty straight forward with reflection   MyClass mobj   MyClass class cast obj     and if class name is different  Object newObj   Class forName classname  cast obj

[java] Dynamically converting java object of Object class to a given class when class name is known

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