public class Pet{
private String name;
public Pet(){
System.out.print(1);
}
public Pet(String name){
System.out.print(2);
}
}
public class Dog extends Pet{ public Dog(String name){
//這里隱藏了一句代碼:super.pet();
System.out.print(3);
}
}
執(zhí)行new Dog(“棕熊”);后程序輸出是哪項(xiàng)?()
A. 23
B. 1 3
C. 123
D. 321