In java 8, why cannot call the interface static method that the current class is implementing -

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• why class static methods inherited not interface static methods? 3 answers

i'm playing around java 8's new features , observed interesting behaviour:

this okay:

class { static void staticmethodina() {println();} } class b extends {}  b.staticmethodina(); 

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this induce error of: static method may invoked on containing interface class only.

interface { static void staticmethodina() {println();} } class b implements {}  b.staticmethodina(); // here intellij complaints.. 

can tell me why designer of java 8 may choose treat above 2 cases differently?

addition of static methods in interface in java 8 came 1 restriction - methods cannot inherited class implementing it. , makes sense, class can implement multiple interface. , if 2 interfaces have same static method, both inherited, , compiler wouldn't know 1 invoke.

however, extending class, that's no issue. static class methods inherited subclass.

see jls §8.4.8:

a class c inherits direct superclass concrete methods m (both static , instance) of superclass

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a class c inherits direct superclass , direct superinterfaces abstract , default (§9.4) methods m

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a class does not inherit static methods superinterfaces.