将下列哪个代码替换下列程序中的【代码】不会导致编译错误? A: publicintf(){return100+M;} B: intf(){return100;} C: publicdoublef(){return2.6;} D: publicabstractintf();

将下列(A,B,C,D)哪个代码替换下列程序中的【代码】不会导致编译错误。 A: publicdoublef(){return2.6;} B: intf(){return100;} C: publicintf(){return100+M;} D: publicabstractintf();

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