In the following statement: public abstract class Vehicle extends DD implements Car{ ...} DD can never be an abstract class.
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Q: An abstract class can extend another abstract class and implement multiple interfaces.
A: Because Classes can only extend from one other class, but can implement multiple interfaces.
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Q: Abstract classes need their subclasses to implement their abstract methods. Is it true?
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A: Please find the detailed answer in the following steps.
Q: Given the following definitions: public abstract class Manager extends Employee { ... } public class…
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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: What is fundamental difference/s between an abstract classes and interface
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Q: A subclass of an abstract class must implement all abstract methods of the parent class. True or…
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A: Ans : False that An object can be created from an abstract class.
Q: parent's
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Q: ds in an abstract class must be overriden and implemented classes only become useful when we create…
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Q: What is an abstract class? Explain in detail with a coding example.
A: What is an abstract class? Explain in detail with a coding example.
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- Vehicle is an abstract class. Create the Airplane class as a subclass of Vehicle. Extend and override Airplane as necessary to meet the criteria below. The travel method should return the distance traveled by the Airplane object. CODE: abstract class Vehicle { public abstract double travel(double time);} //add class definitions below this line //add class definitions above this line public class Exercise2 { public static void main(String[] args) { //add code below this line //add code above this line }}Make 3 choices. Which of the following are incorrect? Select 3 correct answer(s) An abstract class contains constructors. The constructors in an abstract class should be protected. The constructors in an abstract class are private. You may declare a final abstract class. An interface may contain constructors.public abstract class Staff implements Payroll { private String name; private String department; private double baseSalary; private LocalDate joinedDate; What to do/change 1. (5) Provide the following: (2.5) Provide a fully parameterized constructor. (2.5) Provide getters and setters for all attributes. Base Salary must be a non-negative value (make all the necessary changes) 2. (5) Add a toString method. The string it returns should first include the name of the class (Doctor and Nurse should be subclasses of Staff). It should look similar to to the following: Expected Output: Doctor Name: Dr. Ahmed Department: Family Medicine Base Salary: 10000.0 Joined Date:2019-03-04
- An instance of an abstract class is made by using the keyword 'new'. true or falseGiven the following definitions: public abstract class Manager extends Employee {...} public class Executive extends Manager { ... } What kind of classes are Manager and Executive, respectively? Abstract, overridden O Abstract, concrete Abstract, final O Public, finalYour are given the following classes: public abstract class Animal{ public abstract void talk(); } public class Dog extends Animal{ public void talk(){ System.out.println ("Woof"); } } public class Cat extends Animal{ public void talk(){ System.out.println ("Meow"); } } You must modify the class Owner provided below, so that objects of this class can hold objects of both classes Dog and Cat in their array. Note you must also modify the methods add and getPet accordingly. Answer: (penalty regime: 0 %) Reset answer public class Owner{ private Dog[] dogs; private int numDogs=0; 3 4 public Owner(){ dogs = new Dog[5]; } 6. 7 8 public void add(Dog a){ dogs[numDogs] = a; numDogs++; } 9 10 11 12 13 public Dog getPet (int index){ return dogs[index]; } 14 15 16 17 }
- A subclass of an abstract class must be able to do all of the things the parent class can do. True or not?Incorrect Question 7 public abstract class Shape { public abstract int getNumberSides(); } public class Triangle extends Shape { } public int getNumberSides () { return 3; } public abstract class Square extends Shape { } Which of the following are correct? We can create objects of type Shape. We can create objects of type Square. We can create objects of type Triangle. Square needs to be an abstract class because it does not define the numberSides method.. The class header for Square should not have the word abstract in it.A subclass of an abstract class must implement all of the parent class's abstract methods. Is it true or false?
- 1- public class Student { 2 3 public abstract double calcScore(); 4 5 } Which of the following is true about the code segment above? O a. Add return statement in the public abstract double calcScore(); O b. Student class should be declared abstract. O c. public abstract double calcScore(); is not a valid method declaration. O d. public abstract double calcScore(); should not end with semicolon. Clear my choice4. Given, an abstract class as the following: abstract class Test{ abstract void add(); } Which one of the following statement is valid? a. Test to =new Test() b. new Test(); c. Test [Jarray=new Test[5]; d. Test to =new Test(10);Design a class that implements the basic properties of a die. Consider the definition of the following class die.(Beginner) class die { public: die(); //Default constructor //Sets the default number rolled by a die to 1 void roll(); //Function to roll a die. //This function uses a random number generator to randomly //generate a number between 1 and 6, and stores the number //in the instance variable num. int getNum() const; //Function to return the number on the top face of the die. //Returns the value of the instance variable num. private: int num; }; a) Write the definitions of the functions to implement the operations for the class die. b) Write a program that uses the class die to roll 10 dice. (Use an array of size 10 to implement 10 dice.) The program prompts the user to enter the desired sum and the number of times the dice are to be rolled. The program outputs the number of times the desired sum was rolled. Test run your program to roll the 10 dice 10000 times with the desired…
