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Abstract Class

 
Greenhorn
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code:
--------------------------------------------------------------------------------

public class AS{ private class AB extends A{} } abstract class A { // 1 private abstract void m1(); // 2 private abstract class B {} // 3 private class C extends B {} // 4 }

--------------------------------------------------------------------------------



this Code give me an error can any one explain me.. why compiler come up with error ?
 
Hemant Gupt
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Apologies for d above format
code:
--------------------------------------------------------------------------------

public class AS{
private class AB extends A{}
}

abstract class A { // 1
private abstract void m1(); // 2
private abstract class B {} // 3
private class C extends B {} // 4 }

--------------------------------------------------------------------------------



this Code give me an error can any one explain me.. why compiler come up with error ?
 
Sheriff
Posts: 11343
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Originally posted by Hemant Gupt:
...this Code give me an error can any one explain me.. why compiler come up with error ?


I think the error messages are pretty clear:
  • illegal combination of modifiers: abstract and private [in] private abstract void m1();
  • AS.AB is not abstract and does not override abstract method m1() in A

  • If a method is abstract, that means the implementation will be provided is a subclass. But if a method is private, then it cannot be overridden. Therefore, abstract and private cannot be used together on a method.

    If a class extends an abstract class, then it must either provide implementation for any abstract methods it inherits or be declared abstract itself.
    [ June 16, 2008: Message edited by: marc weber ]
     
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