- An abstract class may have constructors
- It is illegal to invoke the new operator on an abstract class
- An abstract class is allowed to have method implementations
- There is no restriction about the placement of abstract classes in a class hierarchy
- It is legal for an abstract class to implement an interface and implement one or more interface methods
- A well-encapsulated class must have all of its attributes marked private
- A well-encapsulated class must hide all internal methods.
- NOT all attributes require accessor or mutator methods
From: http://sitestree.com/?p=4936
Categories:Java Short Notes
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Post Data:2008-07-21 09:28:29
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