About Question enthuware.ocpjp.v8.-2-.1827 :

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johnlong
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About Question enthuware.ocpjp.v8.-2-.1827 :

Post by johnlong »

Hi

Explanation says:
You cannot override a static method with a non-static method and vice-versa.

Code: Select all

interface i1{
	static void m1(){}	
}

interface i2 extends i1{
	default void m1(){}
}
But it's possible to override static method with default one.

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admin
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Re: About Question enthuware.ocpjp.v8.2.1827 :

Post by admin »

What you have shown is not overriding. The concept of overriding applies only to instance method.
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zukras
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Re: About Question enthuware.ocpjp.v8.2.1827 :

Post by zukras »

What "vice-versa" means in this context then? I guess I would suggest to choose different wording. Very confusing.

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Re: About Question enthuware.ocpjp.v8.2.1827 :

Post by admin »

It means you cannot override a non-static method with a static method either. The second line of the explanation already makes it very clear, " You can, however, redeclare a static method of a super interface as a default method in the sub interface."
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crazymind
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Re: About Question enthuware.ocpjp.v8.2.1827 :

Post by crazymind »

You can, however, redeclare a static method of a super interface as a default method in the sub interface.
How about redeclare a default method of a super interface as a static method in the sub interface? Option 1 seems correct ...

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Re: About Question enthuware.ocpjp.v8.2.1827 :

Post by admin »

What happened when you tried it out?
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crazymind
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Re: About Question enthuware.ocpjp.v8.2.1827 :

Post by crazymind »

admin wrote:
Wed Mar 06, 2019 7:49 pm
What happened when you tried it out?
static String getId(){ return "AIN8888"; } }
^
overriding method is static


Why? I am trying to redefine default method to static method not overriding it.

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Re: About Question enthuware.ocpjp.v8.2.1827 :

Post by admin »

So you can see that it is not allowed. Rule of the language.
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bvrulez
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Re: About Question enthuware.ocpjp.v8.2.1827 :

Post by bvrulez »

The explanation to the first (not correct) option is:

"You cannot override a static method with a non-static method. You can, however, redeclare a static method of a super interface as a default method in the sub-interface."

The option was to use "static String getId() {return "AIN8888"; }" to override "public default String...". So, the explanation refers to a different problem and is not fitting the option. The Explanation should say: "You cannot redeclare a default method as a static method in a sub-interface."

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Re: About Question enthuware.ocpjp.v8.2.1827 :

Post by admin »

You are right. Fixed.
thank you for your feedback!
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d0wnvk@gmail.com
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Re: About Question enthuware.ocpjp.v8.2.1827 :

Post by d0wnvk@gmail.com »

admin wrote:
Thu Feb 20, 2020 4:49 am
You are right. Fixed.
Not fixed.
The latest version of question bank is 1/81.

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Re: About Question enthuware.ocpjp.v8.2.1827 :

Post by admin »

It is fixed. The explanation says, "You cannot override a non-static method with a static method and vice versa.". The last part was not there earlier.
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