🚀 go-pugleaf

there is no need to cast, instance_Of_myClass will have the 
proper runtime type "automatically". To verify this try 
System.out.println(instance_Of_myClass.getClass().getName());
The reference type (compile time) however is Object.

You can't simulate the following:
MyClass instanceOfMyClass = (MyClass)myClass_list.get(i);
Note that the *compile time* type of instanceOfMyClass now
is MyClass rather then Object. The runtime type is MyClass in 
both examples.

Casting includes a compile time check and Class.forName() stuff
is run-time only. 
http://java.sun.com/docs/books/jls/second_edition/html/conversions.doc.html#20232

You would probably want the above to work because you need to 
access members of your instanceOfMyClass. If so, you would need 
to use reflection to access those members.
http://java.sun.com/docs/books/tutorial/reflect/index.html

Torsten

"wuliao999" no wrote:
>   String className="com.borland.myClass";
>   ArrayList myClass_List;
>   Object Instance_Of_myClass=myClass_list.get(i);
>
>Then, how can I cast Instance_of_myClass to myClass ?