A.Float B.Integer C.Double D.Character
class Animal{ Animal getOne(){return new Animal();}} class Dog extends Animal{ //insert code here } class AnimalTest{ public static void main(String[] args){ Animal[] animal={ new Animal(), new Dog()}; for(Animal a:animal){ Animal x= a.getOne(); } } } 和代碼: 3a.Dog getOne() { return new Dog();} 3b.Animal getOne() { return new Dog();} 第3行中插入的哪項(xiàng)編譯且運(yùn)行無(wú)異常?
A.3a行或3b行 B.既非3a,也非3b C.3a行 D.3b行
class TestApp{ public static void main(String[] args){ System.out.println(multiply(2,3,4,5)); } public int multiply(int... nums){ int result=1; for(int x:nums) result*=x; return result; } } 程序運(yùn)行后的輸出是哪項(xiàng)?()
A.120 B.24 C.14 D.編譯錯(cuò)誤