Which of the following statements regarding abstract classes are true? Options: A . &nbspAn abstract class can be extended. B . &nbspAll of these C . &nbspAn abstract class can be used as a data type. D . &nbspA subclass of a non-abstract superclass can be abstract. E . &nbspA subclass can override a concrete method in a superclass to declare it abstract.

Which of the following statements regarding abstract classes are true?

Question

Which of the following statements regarding abstract classes are true?

Options:

A . An abstract class can be extended.

B . All of these

C . An abstract class can be used as a data type.

D . A subclass of a non-abstract superclass can be abstract.

E . A subclass can override a concrete method in a superclass to declare it abstract.

Answer: Option B

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Question 1. 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....B b = new A();4. B b = new B();

Question 2. Which of the following class definitions defines a legal abstract class?....

Question 3. Which of the following is a correct interface?....

Question 4. Given the following piece of code:public interface Guard{ void doYourJob();}abstract public class Dog implements Guard{ ....Dog implements Guard{ }which of the following statements is correct?

Question 5. What will be the output?interface A{public void method();}class One{public void method(){System.out.println("Class One m....extends Two{public static void main(String[] args){A a = new Two();a.method();}}

Question 6. In Java, declaring a class abstract is useful....

Question 7. Determine output of the following code.interface A { }class C { }class D extends C { }class B extends D implements A { }....(b instanceof C) System.out.println("b is an instance of C"); }}

Question 8. Which two of the following are legal declarations for abstract classes and interfaces?1. final abstract class Test {}2. ....{}5. protected interface Test {}6. abstract public class Test {}

Question 9. What will happen after compiling this program code?abstract class MyClass{ //line 1 private int a, b; public void call(i....args[]){ MyClass m = new MyClass(); //line 2 m.call(12,25); }}

Question 10. Interface Test{ int p = 10; //line 1 public int q = 20; //line 2 public static int r = 30; //line 3 public static final ....//line 4}Which of the above line will give compilation error?

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