Which of the following is true of abstract classes? a.An abstract class cannot have child classes b.An abstract class is a parent class with more than one child class. c.An abstract class cannot be instantiated. d.An abstract class is another name for a base class.   Which of the following is true of abstract methods? Select one: a.An abstract method is a method of the child class which overrides a parent method. b.An abstract method is a method without a body which is declared using the keyword abstract. c.An abstract method is any method of an abstract class d.An abstract method is a method which cannot be inherited.   Can an abstract class define both abstract and non abstract methods. a.No. All methods must be one or the other. b.No. All methods must be abstract. c.Yes, but the child classes do not inherit the abstract methods. d.Yes. The child classes inherit both.

Q: 5)When the inheritance is private, the private methods in base class are __________ in the derived…

A: 4. Answer b. Compiler Error in line "Base  *bp=new Derived"; 5. Answer a. Inaccessible.

Q: 4. Supposed you would like to override a method with a default modifier in the superclass, which…

A: Rule for Access Modifier of overridden method : Access Modifier of the overriding method (method of…

Q: It is the ability of an object to have many forms? Select one: O a. Interface O b. Polymorphism O c.…

A: Interface :- In this function declared only there is no function body   Inheritance :- class that…

Q: Define two classes, Patient and Billing, whose objects are records for aclinic. Derive Patient from…

A: UML(Unified Model Language)class diagram of the Person, Billing, Patient, and Doctor:

Q: Create a class named 'Member' having the following members: Data members 1 - Name 2 - Age 3 - Phone…

A: EXPLANATION -  A class employee is created and which inherit class member and declare…

Q: Q2\A\ fill the blanks ( answer three) 1- The private part of Class called -------- and the public…

A: Here, I have to answer the above questions.

Q: What is a characteristic of static members? O a. For every object created, there is only one field…

A: About Characteristics of static members

Q: Can a derived class (i.e., Subclass) directly invoke a private method of the base class (i.e., Super…

A: Given: Can a derived class (i.e., Subclass) directly invoke a private method of the base class…

Q: Can a derived class (i.e., Subclass) directly invoke a private method of the base class (i.e., Super…

A: No. We can't derive a private method directly from it's base class Private access specifier allow…

Q: Given: abstract class A{ int a; int b; } class B extends A{ int a; } O cannot make class A abstract…

A: Answer 1: A- cannot make class A abstract   Abstract classes can not be instantiated.

Q: If class A is a subclass of class B, then A has access to all of B's instance variables, including…

A: Private data: A private data can be accesses within the class only.  Private data not allowed to…

Q: II. Answer the following questions; provide appropriate explanations for your answer. 1. Every…

A: INTRODUCTION: We need to tell the ways inheritance promotes defect reduction.

Q: 3. What is the difference between method overriding and method overloading?

A: 3. What is the difference between method overriding and method overloading? Method…

Q: Create an interface Wheel with methods setWheels (int c) and getWheels () and a class Vehicle with…

A: Create an interface Wheel with methods setWheels (int c) and getWheels () and a class Vehicle with…

Q: 2 a) Suppose that two methods are defined in a same class. One method is static and another one is…

A: A. REASON -  It is not possible to call directly a non static method from a static method  , because…

Q: Q# Which of the following might have only method signatures? Group of answer choices 1. An interface…

A: Given:- Which of the following might have only method signatures?

Q: Build an abstract class named Salary that has the following: -One abstract method named…

A: Code: abstract class Salary{ abstract void calculateSalary(); void MinimumSalary() {…

Q: Given the following classes, answer the below questions. 1. Person (abstract class) that has the…

A:

Q: How many default constructors can a class have?   a.  A class cannot have a default constructor.…

A: Correct Option - b: only one

Q: an a derived class (i.e., Subclass) directly invoke a private method of the base class (i.e., Super…

A: The given problem is related to Object-oriented programming where the Inheritance feature is being…

Q: I'm trying to override a superclass method by redefining the method in the child class, but the code…

A: ALGORITHM:- 1. Define a Parent and child class. 2. Override the display function() in child class.…

Q: In this Assignment you will use an abstract class to define, read, store, and print questions for a…

A: The objective is to write the code of program and create a class to define, read, store, and print…

Q: me B is a subclass of A. Which of the statements about the following assignment is false? A a = new…

A: Lets see the solution.

Q: What will be the output of the following code? a. Compilation error in line 1 (abstract method…

A: The given code is: abstract class student{ private abstract void addStudent();    abstract void…

Q: Define the class Student which has the private members name, department, and mark. It has the public…

A: The, code has given below:

Q: 1. Can you declare a class that contains abstract methods a non-abstract class? 2. Can you declare…

A: 1. No, the abstract methods can't be declared in non abstract class, it is the same reason you can't…

Q: Convert the UML class diagram above into a java code with the following conditions The methods in…

A: Actually, UML  stands for Unified Modeling Language.

Q: ou need to write the complete code as mentioned below:  i) The main class with necessary codes.…

A: Summary:In this question, we need to create a superclass, subclass, and test class to test the…

Q: Q4. In a restaurant, whenever customers visit, they are provided with items from two categories, one…

A: Source codeBattery classpackage com.company;public class Battery {    //instance variable…

Q: When would you be most likely to use an abstract class? when you need to derive a class from…

A: An abstract class is most likely to be used when a superclass is required that should be not be…

Q: Write the difference between interface and abstract class

A: Interfaces and abstract classes are features of object-oriented programming languages (Java, C#) The…

Q: Create a base class with an abstract print( ) method that is overridden in a derived class. The…

A: Program approach: Creating an abstract base class named as Base Creating an abstract method inside…

Q: UESTION 16 What must be true of a class with one abstract method? O The class must also implement…

A: 16) The abstract method must have the static modifier 17)   Because we're using an array, all pets…

Q: Which of the following are incorrect? (Choose all that apply A. You may declare a final abstract…

A: We cannot make an abstract class as final because as we know a final class cannot be subclassed and…

Q: Answer with True or False for the following. Explain your answers. -It is legal to write a method…

A: While overriding only occurs in an inheritance relationship, overloading can occur within the same…

Q: 4. Given, an abstract class as the following: abstract class Test{ abstract void add(); } Which one…

A: Answer: The right choice is option b.new Test() ;   Simply in the given question right option b is…

Q: 5. Is it compulsory for a class, which has been declared as abstract, to have at least one abstract…

A: An abstract class is defined as hiding the implementation and showing the function definition to the…

Q: Write a Java operator/keyword, which can be used to check the validity of reference before…

A: Note-Since your question contain multiple question but we can answer only one at a time for you due…

Q: What is the output of the following code? Convert the abstract class into an interface and modify…

A: To do: Output of the given code

Q: Which statement is true?   Question 14 options:   An abstract method is a method that appears in a…

A: Answer to the above question about true statements of Abstract method is in step 2.

Q: Write only the appropriate classes definition for described below: Let's consider class Employee's.…

A: public class Employee{    //declaring instance variables    private String firstName;    private…

Q: Which of the following statements is TRUE about abstract classes in Java? A. An abstract class…

A: An abstract method is a method which has only declaration and definition is provided in some other…

Q: Using any application of your choice, write a Java program that meets the following requirements: It…

A: public abstract class Student //declaring abstract class { private int studentNumber; //declaring…

Q: A method defined within a class and whose header does NOT include the static modifier is known as…

A: A class is a collection of methods and members and there are various types of methods and let's…

Q: Class A is composed of objects of class B, class B is extended by C & D. There should be a copy…

A: Explanation: A is composed of objects of class B, so it does not need a copy constructor. B is…

Q: When should you use an abstract class? Group of answer choices   1. All options are correct.   2.…

A: Answer: when abstract class use then two or more classes can share identical method so option 2 is…

Q: Which of the given modifiers is used when an abstract method is implemented by a derived class? a.…

A: Answer to the above question is in step2.

Q: Use the parent classes to the left to help you solve this problem. The first parent is the Person…

A: