Abstract Class

[Hemant Gupt]

code:
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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 }

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this Code give me an error can any one explain me.. why compiler come up with error ?

[Hemant Gupt]

Apologies for d above format
code:
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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 ?

[marc weber]

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 ]