多选题In which two cases does the compiler supply a default constructor for class A?()Aclass A{}Bclass A { public A(){} }Cclass A { public A(int x){} }Dclass Z {} class A extends Z { void A(){} }

多选题
In which two cases does the compiler supply a default constructor for class A?()
A

class A{}

B

class A { public A(){} }

C

class A { public A(int x){} }

D

class Z {} class A extends Z { void A(){} }


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