Question

Suppose A is an abstract class, B is a concrete subclass of A, and both A and B have a default constructor. Which of the following is correct?
1. A a = new A();
2. A a = new B();
3. B b = new A();
4. B b = new B();
A.1 and 2
B.2 and 4
C.3 and 4
D.1 and 3

Answer 1

I think (3) options is correct

Answer 2

Option B is Correct:

Explanation:

• In programming languages, an abstract class is a generic class (or sort of object) used as a foundation for developing .
• Abstract methods can't have body. Abstract class may have static fields and static method, like other classes.
• When no access modifier is specified for a class, method, or data member – It is stated to be having the default get right of entry to modifier through default.
• The data members, class or methods which aren't declared the usage of any get right of entry to modifiers i.e. having default access modifier are on hand best in the equal package.

Answer = Option B (2 , 4)