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Ranch Hand
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Can someone please explain the following statements:

"In case where you want to use implementation inheritance then it is usually provided by an abstract base class" - what is implementation/class inheritance ?

"Abstract classes let you define some default behaviour and force subclasses to provide any specific behaviour" - what does behaviour mean here, any example ?


 
Ranch Hand
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"Abstract classes let you define some default behaviour and force subclasses to provide any specific behaviour"


Abstract class can have concrete methods which can provide a default behaviour.
A class marked as abstract can have methods which have the method body (i.e method defintion) .
So if any class extends this abstract class it may or may not override the default behaviour provided by the concrete method in an abstract class.
For eg:


But an interface is 100% abstract which implies that there are no concrete methods so the class implementing the interface must provide
the behaviour for all the methods spcified in the interface.

 
Bartender
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Please do not waste everybodys time by asking the same question all over again. Last time you asked it, you were provided a link with the explanation. In case you did not understand anything from that link you can continue in the previous post http://www.coderanch.com/t/488459/Java-General/java/Interface-vs-Abstract-class
 
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