题目内容

下列接口的定义,__________ 是正确的?

A. interface A { void print() { }; }
B. abstract interface A { print(); }
C. abstract interface A { abstract void print() { };}
D. interface A { void print();}

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A. class A implements B
B. class B implements A
C. class A extends B
D. class B extends A

A. 程序没有输出
B. b is an instance of A.
C. b is an instance of C.
D. b is an instance of A b is an instance of C.

A a = new A();
B. A a = new B();
C. B b = new A();
D. B b = new B();