chun-ju Lin

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since Feb 18, 2004
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Recent posts by chun-ju Lin

Can someone tell me why abstract class can't produce instance object?
Thanks.
19 years ago
Thank you ,but I still hadn't get the point.
My text book wrote that ,"Excepiton" is what we can control and "Error" is what we can't control . Maybe what you talked about is "Error",not"Runtime Exception". Please tell me.
19 years ago
I only know that if I don't want to "try and catch" a Checked Exception,I can "throws" it away,and if I want to show some mistake message,I can "throw" a Runtime Excepiton/Checked Exception object in a method.
If I "throw" a Checked Exception object in a method ,I have to "throws" it in the method declearation,or it will compile error.
My problem is that,"if we throw a Runtime Excepitonobject,why don't we need to throws it?".
What time shoud we "throws" a Runtime Excepiton ?
19 years ago
I get the point,thank you for help.
19 years ago
Could someone tell me the difference between instance ,static and local variable?I only know that static variable comes with class and instance variable comes with object,but how about local variable?In what situation should I use local variable?
Sorry ,my English is very poor.
19 years ago
I am just a bigginer,so maybe my question is a little stupid.
Dose overload only happen in one class,or just like override,one child class can overload it's parent class's method?
20 years ago