When a concrete class inherits from an abstract class, you have to implement all abstract methods declared in the super class before you can instantiate it (the concrete class). True False
Q: What is the difference between a concrete and an abstract class?
A: Find Your Answer Below
Q: A subclass of an abstract class must implement all of the parent class's abstract methods. Is it…
A: When an abstract class is subclassed, the subclass usually provides implementations for all of the…
Q: Consider the foliowing code snippct which throw co.pilation error. Explain the reason of compilation…
A: You can declare a class as final by adding the modifier final in the class header. If you declare a…
Q: Can we use a default constructor of a class even if an explicit constructor is defined?
A: 1) The default constructor is the no-argument constructor automatically generated unless you define…
Q: en the inheritance is private, the private methods in base class are * .in the derived class (in…
A: Ans.) Option B i.e. Unreachable. Expalanation:- When the inheritance is private, the private…
Q: A class type cast can be used to force an object reference to be converted nto another object…
A: type cast is process of converting one type into another type. It could be implicit or explicit
Q: rewrite the following class code to make employeeType as an abstract class, if you know that both…
A: In C++, an abstract class is one that contains one or more than one pure virtual function (a…
Q: A subclass of an abstract class must be able to do all of the things the parent class can do. True…
A: The answer of this question is as follows:
Q: What are the differences between abstract classes and concrete classes?
A: Abstract Class: Abstract class in java is declared by using keyword abstract. An object of abstract…
Q: If a class is abstract, what cannot be done with the class?
A: If a class is abstract, it implies that the class desires to hide the implementation details of it.…
Q: Consider the following code snippet which throw compilation error. Explain the reason for the…
A: We are given a java code where a declaration is given and this part of the code is throwing a…
Q: You need a means of guarding against unintentional corruption of class fields.
A: Introduction Field protection: There are primarily two methods for field protection against…
Q: You only can instantiate concrete classes, not abstract ones. But you can extend abstract classes as…
A: this statement is true You can only instantiate concrete classes, not abstract ones, but you can…
Q: True/False: When instantiating an object of an abstract class, you can do it with the keyword new.
A: Abstract Class: Like Interfaces, an abstract class is an incomplete class. They have abstract…
Q: Create an abstract class named Monster. It should contain a single abstract method,…
A: abstract class Monster{ public abstract double areaOfDestruction();}public class Robot extends…
Q: True or False Properties in a base class cannot be overridden in the same way that methods can be…
A: The answer is given below,
Q: Write the classes as shown in the following class diagram. Add a tester that asks the user for a…
A: public abstract class Animal{ //declaring variable private String name; //constructor…
Q: Declaring a class virtual transforms it into an abstract class. T/F
A: Introduction: When it comes to object-oriented programming, a virtual class is a form of class where…
Q: You can make a class abstract by declaring it with keyword abstract. An abstract class normally…
A: An abstract class is a class which can have 0 or more abstract methods An abstract class is declared…
Q: When invoking a constructor from a subclass, its superclass’s no-arg constructor is always invoked.…
A: Please find the answer to the above question below:
Q: An cannot be instantiated, they act as place holders for abstraction. a. Abstract class O b.…
A: A correct option is an option a i.e Abstract class
Q: : Java Class Inheritance with an abstract class Define a class Employee with the following…
A: As per our guidelines we are suppose to answer the first question. Kindly post the remaining…
Q: True or false? When invoking a constructor from a derived class, its base class’s no-arg constructor…
A: Given: True or false? When invoking a constructor from a derived class, its base class’s no-arg…
Q: What is primary difference between an abstract class and a regular class?
A: Difference between an abstract class and a regular class:
Q: 17. In an interface. can have concrete as well as abstract method all methods need to be concrete…
A: Given:
Q: Given the following definitions: public abstract class Manager extends Employee { } public class…
A: Answer: We have explain some classes in java in brief explanation
Q: What makes an abstract class different from other classes?
A: What makes an abstract class different from other classes?
Q: Q10: Selct a false statement about abstract classes. a. An abstract class cannot be instantiated…
A: False Statement from the above abstract class
Q: Which of these is not a correct statement about abstract class? a. Every class containing abstract…
A: Abstract Classes are the classes that contain 0 or more abstract methods
Q: An instance of an abstract class is made by using the keyword 'new'. true or false
A: An instance of an abstract class is made by using the keyword 'new' :
Q: To implement an interface, a concrete class must implement AT LEAST ONE method heading
A: The answer:
Q: Abstract methods must be implemented by any subclass of an abstract class that is derived from it.…
A: Given: Abstract methods must be implemented by every abstract class subclass that is inherited from…
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: In a subclass, may the overridden method's scope be altered?
A: your question is about In a subclass, may the overridden method's scope be altered? let's solve the…
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: When we extend a class, the subclass's constructor only needs to call the super() constructor if we…
A: Solution: Given, Correct answer is : True Explanation:
Q: An cannot be instantiated, they act as place holders for abstraction. O a. Abstract class O b.…
A: an Abstract class can be Subclassed but it cannot be instantiated. Also, only this acts as place…
Q: Both abstract classes and interfaces may be used to specify the behavior of common objects. Which…
A: Introduction: Interfaces and abstract classes are both characteristics of object-oriented…
Q: Create an abstract class named capstone with necessary abstract methods in Package 1 and define…
A: 1. create an abstract class to let the other class know.2. create base class which extends the…
Q: Write the difference between interface and abstract class.
A: Basic Interface Class Abstract Class implementations Method interface can't have implementation…
Q: A subclass must fully implement all of the abstract methods of its parent class in order to be…
A: Given: If the subclass being used is not itself an abstract class, then the subclass of an abstract…
Q: Write an abstract superclass encapsulating a student. This abstract superclass named Student has two…
A: Required Java code with Screenshot of sample output provided below :
Q: Why would a class be declared as abstract?
A: REASONS TO DECLARE THE CLASS AS ABSTRACT: Abstract class are used for the purpose of providing…
Q: Create a class Animal and Add a protected data member named id of integer type. Add get/set methods…
A: Key Points When we make any object of class at that time constructor would be called. And when…
Q: True or False, An abstract class must have at least one abstract method.
A: An abstract class is defined as a class which contains 0 or more abstract methods. If it contains…
Q: Write an abstract class, it can be anything well defined from the very basics.
A:
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: Private methods can not be overrided in inheritance. True or false.
A: In java, private methods are not visible to the child class or any other class which confines…
Q: If a class inheriting an abstract class does not define all of its functions then it is known as?…
A: HELLO THEREI AM ADDING ANSWER BELOW PLEASE GO THROUGH IT THANK YOU
OOPs
In today's technology-driven world, computer programming skills are in high demand. The object-oriented programming (OOP) approach is very much useful while designing and maintaining software programs. Object-oriented programming (OOP) is a basic programming paradigm that almost every developer has used at some stage in their career.
Constructor
The easiest way to think of a constructor in object-oriented programming (OOP) languages is:
Step by step
Solved in 2 steps
- Overloading is achieved when two or more methods in the same class have the same1. Create abstract class Pet , which is the abstract super class of all animals.1. Declare an integer attribute called legs, which records the number of legs for this animal.2. Define a constructor that initializes the legs attribute.3. Declare an abstract method eat.4. Declare a concrete method walk that prints out something about how the animals walks (include the number of legs).2. Create the Dog class that implements Pet class.1. This class must include a String attribute to store the name and food of the pet2. Define a default constructor that calls the super class constructor to specify that all dogs have 4 legs and name.3. override the eat and walk method.3. Create the Cat class that Implements Pet class.1. This class must include a String attribute to store the name of the pet, and a string to save food .2. Define a constructor that takes one String parameter that specifies the cat's name. This constructor must also call the super class constructor to specify that all cats have…What happens if you try to override a non-virtual or final method in a derived class?
- Declaring a class virtual transforms it into an abstract class. T/FCreate a class Animal and Add a protected data member named id of integer type. Add get/set methods for id data member in Animal class with public access. Also provide default constructor this should initialize id to 0. Also provide parameterized constructor and toString method. Add an abstract method tellAboutSelf method to Animal class with public access Add another abstract method speak method to Animal class. Reptile, Bird, Mammal Next create the three child classes which extends form Animal class. Add a default constructor to each of the above created class. The constructor should initialize the id data member id, Reptile, Bird and Mammal, to 1, 2 and 3 respectively also it display a message “(class Name)’s default constructor”. E.g. for Bird it says “Bird’s default constructor”. Add a parameterized constructor to each of the above created class. The constructor should initialize the id data member, Reptile, Bird and Mammal, to the specified id passed to the constructor also it…True or False a. If you do not write a constructor for a class, java will supply a default constructor. b. Java does not allow constructors to be overloaded. Abstract methods must have a void return type. d. All classes have a default equals (Object) method even if their programmer didn't write one for it. You can override a static method defined in a superclass. A method can have at most one return statement. g. A method cannot return a Wrapper class reference. h. The reserved word super can be used to access a constructor in a parent class. i. Object is an abstract class. e. f.
- An instance of an abstract class is made by using the keyword 'new'. true or falseIn-class Assignment Day 8 You should draw the hierarchy for your classes to understand how the coding should be structured. Be sure to notate any classes that are abstract. Write an abstract class for Shape. The intended subclasses are Polygon, Circle, Triangle, and Rectangle. All of these will have a name, an area, and a perimeter. (Consider which methods might be abstract.) Add a toString method that will return the information about the Shape, for example: Triangle, Area: 7.5, Perimeter: 12.0 Write the class Rectangle. A Rectangle is a Shape and should have a width and a height. When a Rectangle is outputted, it should read: Rectangle, Length: #, Width: #, Area: #, Perimeter: # Write the class for Circle. Every circle is a Shape that has a radius. Be sure to provide an accessor method (getter) for the radius. When a circle is outputted, it should read: Circle, Radius: #, Area: #, Circumference: # Write a TestShape class that has the main method, which creates…2. Implement the class below such that it should provide structure with necessary Data Members to all the sub-classes of itself. The object creation of this class is not mandatory. Book -name:String -author:Author -price:double -qty:int = 0
- public class date { private int day; // from 1 to 31 private int month; // from 1 to 12 private int year; // from 2000 upwards public void advance (); // move to next day }; Implement a constructor that initializes new objects of date class to be set to the 1st of January 2000. Implement setters for day, month, and year. Implement the advance method, which moves to the next day, ensuring that all data members are updated appropriately.QUESTION 16 What must be true of a class with one abstract method? O The class must also implement the Iterable interface Any derived class must implement the method The abstract method must have the static modifier O The method cannot specify a return value QUESTION 17 Suppose we wanted to design a set of classes for a veterinarian's office. Our Customer class looks like this: public class Customer { Pet [] pets; } Select all the statements that are true Once the size of the pets array has been set, it cannot be changed Because we're using an array, all pets must be the same A customer must have at least one pet We also need to declare a Pet class QUESTION 18 What is the proper use of an enumeration? To define a set of ordered values To enforce the use of the Comparable interface O To define, or enumerate, the values returned by a Random object generator O To define the classes in an inheritance hierarchyCreate abstract class Pet , which is the abstract superclass of all animals. Declare a integer attribute called legs, which records the number of legs for this animal. Define a constructor that initializes the legs attribute. Declare an abstract method eat. Declare a concrete method walk that prints out something about how the animals walks (include the number of legs). Create the Dog class. The Dog class extends the Pet class. This class must include a String attribute to store the name and food of the pet Define a default constructor that calls the superclass constructor to specify that all dogs have 4 legs and name. override the eat and walk method. Create the Cat class that extends Pet. This class must include a String attribute to store the name of the pet, and a string to save food . Define a constructor that takes one String parameter that specifies the cat's name and food. This constructor must also call the superclass constructor to specify that all cats have four legs.…