導入包而不指定類

Question

在我的演講中，我得到了以下問題，並告訴他答案是iii.It compiles, runs and prints the string “Hello”但是我相信答案是i. It has a compilation error i. It has a compilation error這是由於B類導入packA的方式不正確，而應該是import packA.A或packA。*我的問題是-這是拼寫錯誤還是可以繼續運行並打印“ Hello”

   J.   Assuming the class A and class B given below are defined in different packages, packA and packB.

    package packA;
    public class A {
        protected void msg() {
            System.out.println("Hello");
        }
    }

    package packB;
    import packA;
    class B extends A {
        public static void main(String[] args) {
            B obj = new B();
            obj.msg();
        }
    }


    which of the following is correct about the class B?

    i.  It has a compilation error
    ii. It has a run time error
    iii.It compiles, runs and prints the string “Hello”
    iv. None of the above

Answer 1

導入確實存在錯誤。 應該是import packA.A; 。