有一个接口定义如下，下列选项中实现了该接口并且不是抽象的是 interface A { int method1(int i); int method2(int j)； }

A．class Ｂ implements Ａ { int method 1(){} int method 2(){} }

B．class Ｂ { int method 1(int i){} int method 2(int j){} }

C．class Ｂ implements Ａ { int method 1(int i){} int method 2(int j){} }

D．class Ｂ extends Ａ { int method 2(int j){} int method 1(int j){} }