interfaceA{doublef(doublex,doubley);}classBimplementsA{publicdoublef(doublex,doubley){returnx*y;}intg(inta,intb){returna+b;}}publicclassE{publicstaticvoidmain(Stringargs[]){Aa=newB();System.out.println(a.f(3,5));//【代码1】Bb=(B)a;System.out.println(b.g(3,5));//【代码2】}}代码1输出()代码2输出()

下列程序段运行结果是()interfaceA{doublef(doublex,doubley);}classBimplementsA{publicdoublef(doublex,doubley){returnx*y;}intg(inta,intb){returna+b;}}publicclassE{publicstaticvoidmain(String[]args){Aa=newB();System.out.println(a.f(3,5));Bb=(B)a;System.out.println(b.g(3,5));}} A: 15.0,8.0 B: 15.08 C: 158 D: 815

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 methodl(int i)； int method2(int j)； } A: classBimplementsA B: { C: int methodl(){) D: int method2(){) E: } F: classB G: { H: int methodl(inti){) I: int method2(intj){) J: } K: class B implements A L: { M: int methodl(int i){) N: int method2(int j){) O: } P: class B extends A Q: { R: int methodl(int i){} S: int method2(int J){} T: }