You cannot instantiate an interface but you can do so to an abstract class. True False
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A: Answer 1: A- cannot make class A abstract Abstract classes can not be instantiated.
Q: An interface can have : instance variables. only method headings without implementation.…
A: Refer to step 2 for the answer.
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A: this statement is true You can only instantiate concrete classes, not abstract ones, but you can…
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A: To explain: To explain why a class need to implement a destructor in a program
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Q: Why is it necessary for a class to implement a destructor? Fill in the blanks with your response.
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Q: True or False An interface can contain only abstract methods and constants.
A: solution:True
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A: Given:
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A: The answer:
Q: An object can be created from an abstract class is it true or false
A: Ans : False that An object can be created from an abstract class.
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A: INTRO The question is about variables and class and here is the solution in the next step.
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A: Required: To implement an interface, a concrete class must implement AT LEAST ONE method headings…
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A: The answer :
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Q: Write the difference between interface and abstract class.
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Q: True or False A class can implement more than one interface.
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Q: Write an abstract class, it can be anything well defined from the very basics.
A:
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:
Abstract Class:
- An abstract class is a class that is declared abstract.
- It may or may not contain an abstract method.
- An abstract class can not be instantiated but can be subclassed.
Step by step
Solved in 2 steps
- T/F1. Interface classes cannot be extended but classes that implement interfaces can be extended.It has just one Main class which tests abstract class Animal and its 3 subclasses: Dog, Cat, and Fish. It also tests the Talkers: Dog, Cat, and Radio. So your job is to write all 6 of these simple classes (they should be less than one page each) : Talker.java - the interface Talker, which has just one void method called speak() Animal.java - the abstract class Animal, which stores an animal's name. (No abstract methods). It should contain 2 methods: a constructor with 1 argument (the name) a method getName() which returns the name. Dog.java - the class Dog, which extends Animal and implements Talker. It should contain 3 methods: a constructor with no arguments, giving the dog a default name of "Fido" a constructor with 1 argument (the name) a speak() method that prints "Woof" on the screen. Use @Override Cat.java - the class Cat, which extends Animal and implements Talker. It should contain just 2 methods: a constructor with 1 argument (the name) (no default name like dogs…1. Design a new Triangle class that extends the abstract GeometricObject class. Draw the UML diagram for the classes Triangle and GeometricObject then implement the Triangle class. Write a test program that prompts the user to enter three sides of the triangle, a color, and a Boolean value to indicate whether the triangle is filled. The program should create a Triangle object with these sides, and set the color and filled properties using the input. The program should display the area, perimeter, color, and true or false to indicate whether it is filled or not.using java programming
- It has just one Main class which tests abstract class Animal and its 3 subclasses: Dog, Cat, and Fish. It also tests the Talkers: Dog, Cat, and Radio. So your job is to write all 6 of these simple classes (they should be less than one page each) : Talker.java - the interface Talker, which has just one void method called speak() Animal.java - the abstract class Animal, which stores an animal's name. (No abstract methods). It should contain 2 methods: a constructor with 1 argument (the name) a method getName() which returns the name. Dog.java - the class Dog, which extends Animal and implements Talker. It should contain 3 methods: a constructor with no arguments, giving the dog a default name of "Fido" a constructor with 1 argument (the name) a speak() method that prints "Woof" on the screen. Use @Override Cat.java - the class Cat, which extends Animal and implements Talker. It should contain just 2 methods: a constructor with 1 argument (the name) (no default name like dogs…Write an abstract class, it can be anything well defined from the very basics.Create a project to play a bunch of games. Add a class that has main() in it. Create an abstract class called Game. Define one instance variable for the name of the game. Define a constructor that takes the name of the game as a parameter and sets it. Define an abstract method called playGame. It takes no arguments and returns void. Create a child class of Game called BoardGame. Rather than implementing playGame, declare BoardGame abstract. Create a child class of BoardGame called Chess or Battleship or Monopoly or whatever board game you want. Implement the playGame with only a message that says the name of the game and that it is being played. Create a child class of Game called CardGame. Rather than implementing playGame, declare CardGame abstract. Create a child class of CardGame for War. Implement the playGame method by with a message that says the game of war is being played. Create a child class of Game called VideoGame. Rather than implementing playGame,…
- Create 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.…Create 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.…Create 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 petDefine 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.Override walk…
- Write the code below for the Computer class. The Computer class must be an abstract class, and have the following methods and attributes: • a public string called HostName • a private int called MemorySize • a public abstract method called shutdown that takes no arguments and returns nothing • a public abstract method called runProgram that takes a String for the name of the program and returns a boolean. • Also include getter/setter methods for the attributesIn what scenarios would you choose to use an abstract class over an interface, and vice versa?Create an abstract super class called Employee with the following attributes: Use JavaDoc comments in the Parent and Child Classes only but use @author for the driver name : String and the following methods getter and setter for the one attribute two constructors an abstract method called getPay() equals() toString() Create a sub class of Employee called SalaryEmployee with the following attribute yearlyPay : double and the following methods getter and setter for the one attribute two constructors getPay() that returns the yearlyPay divided by 52 equals() toString() Create a sub class of Employee called HourlyEmployee with the following attributes: hoursWorked : double payrate : double and the following methods getters and setters for the two attributes two constructors getPay() that returns the weekly pay (multiply hoursWorked by payrate - overtime included and 1.5 times payrate for hours > 40) equals() toString() Create a sub class of Employee called SalesEmployee with the…