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how to achieve abstraction in java

Praveen palukuri
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Joined: Feb 10, 2005
Posts: 65
thank u
Svend Rost
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Joined: Oct 23, 2002
Posts: 904
Inheritence. Use abstract classes and interfaces.

My pleasure..

/Svend Rost
Marilyn de Queiroz
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Joined: Jul 22, 2000
Posts: 9046
    
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Create a method. That method will do something. When calling the method, you are not concerned about how the method does what it does. That's abstraction.


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"Yesterday is history, tomorrow is a mystery, and today is a gift; that's why they call it the present." Eleanor Roosevelt
Stan James
(instanceof Sidekick)
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Joined: Jan 29, 2003
Posts: 8791
There are many definitions of abstraction, but it's about ignoring certain details so you can focus on larger issues. One definition says it's not about being imprecise but finding a new language about the problem so you can be more precise.

In Java abstraction is often about referring to an abstract type - a superclass or interface - rather than a concrete type. I might make a method that refers to List:

You might call my method with an ArrayList or a LinkedList. By ignoring the detail of the exact type I can focus on the big picture of what I want to do with the list.

Does that help?


A good question is never answered. It is not a bolt to be tightened into place but a seed to be planted and to bear more seed toward the hope of greening the landscape of the idea. John Ciardi
 
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