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abstract classes

sreedhara satuluri
Greenhorn

Joined: Mar 17, 2005
Posts: 12
it is seen and read in theory that abstract class cannot be instantiated but there is a program in which an abstract class is instantiated.



please comment on this

[ EJFH: Added "CODE" tags. ]
[ March 17, 2005: Message edited by: Ernest Friedman-Hill ]
Ernest Friedman-Hill
author and iconoclast
Marshal

Joined: Jul 08, 2003
Posts: 24184
    
  34

You're not instantiating abstclass1 and abstclass2; you're instantiating anonymous inner classes that extend abstclass1 and abstclass2 and provide the missing methods. An anonymous class is a real class, and the compiler generates a .class file for it (in this case, likely called
AbstractClass_Ex3$1.class and AbstractClass_Ex3$2.class .) They just don't appear to have a name at the point of declaration. These anonymous classes are every bit as real as abstclass3 and abstclass4.

Note: when you post code, please use the UBB "code" tags. Below the text area where you type your message, there are a bunch of little buttons; one says "CODE". Use that one, and your code will appear formatted in your post.


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It is sorta covered in the JavaRanch Style Guide.
 
subject: abstract classes