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Java Abstraction

 
Greenhorn
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Someone asked me to do abstraction without using abstract keyword. and told possible ways but he didn'e agree. so that pls tell me how we do this.
 
Bartender
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The only abstract thing in Java I can think of which doesn't need (but can use) the abstract keyword are interfaces.
 
Greenhorn
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What about wrapper classes? I can write wrappers to classes and abstract the actual implementation of the method from the user. Isnt this abstraction without using the keyword then? Even in case of patterns, factory pattern, abstract factory pattern etc, user does not know the actual implementation.
 
NarendraMohan Prasad
Greenhorn
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hi this not a way bcause we can use the wrapper object into our programs
 
Bartender
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Was this "someone" your teacher? What are the "possible ways" you came up with?
 
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