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what s the difference between abstract class and interface?
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pinakin raval
Greenhorn
Joined: Jun 28, 2005
Posts: 5
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what is the difference between abstract class and interface?
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Dave Wingate
Ranch Hand
Joined: Mar 26, 2002
Posts: 262
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An interface provides a contract that all implementing classes must meet. If a class is declared to implement an interface, then it must provide an implementation for each method defined in the interface.
An abstract class is similar in that it may declare abstract methods whose implementation is defered to child class(es). An abstract class cannot be instantiated. Sometimes it is useful to use abstract classes becausem unlike interfaces, you can include method implementations for no abstract methods that will be common to all child classes (assuming you don't override them).
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Fun programming etcetera!
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Ernest Friedman-Hill
author and iconoclast
Marshal
Joined: Jul 08, 2003
Posts: 24057
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Moving to JiG(Beginner).
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[Jess in Action][AskingGoodQuestions]
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Ilja Preuss
author
Sheriff
Joined: Jul 11, 2001
Posts: 14112
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http://faq.javaranch.com/view?InterfaceVsAbstractClass
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The soul is dyed the color of its thoughts. Think only on those things that are in line with your principles and can bear the light of day. The content of your character is your choice. Day by day, what you do is who you become. Your integrity is your destiny - it is the light that guides your way. - Heraclitus
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subject: what s the difference between abstract class and interface?
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