#Multiple Choice homework problem

16 messages · Page 1 of 1 (latest)

prime cairn
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I spent hours searching the web and trying to understand this : D

Which of the following statements about abstract class are true? (Choose all that apply)
-Abstract class is a hybrid of concrete class and abstract interfaces.
-Abstract class can be initiated itself.
-Abstract class cannot have attributes.
-Abstract method is only allowed to be in abstract class.
-Abstract method must be implemented.
-Abstract class can extend from a superclass and implement multiple interfaces.

covert kestrelBOT
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stiff halo
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2 3 are wrong, 4 5 6 are right

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And 1 is wrong

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Hope it will help you

prime cairn
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Oh i thought an abstract method doesn't need to be implemented in abstract class itself since its only job of the subclasses is to implement it

stiff halo
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Finally,it has to be implement to be used

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Otherwise,there is no meaning to create this abstract method

prime cairn
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ohhhh

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thanks sm

covert kestrelBOT
# prime cairn thanks sm

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prime cairn
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also I said 1, 4, and 5 are correct here:

Which statements about polymorphism and method inheritance are correct? (Choose all that apply)

  • It cannot be determined until runtime which overridden method will be executed in a parent class.
    -It cannot be determined until runtime which hidden method will be executed in a par- ent class.
    -Marking a method static prevents it from being overridden or hidden.
    -Marking a method final prevents it from being overridden or hidden.
    -The reference type of the variable determines which overridden method will be called at runtime.
    -The reference type of the variable determines which hidden method will be called at runtime.
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I think that's correct

stiff halo
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If you wanna see the answer after you finished,you can use chatgpt,and in addition you can let it explain to you.