(T/F) Mutable classes can easily be made immutable by taking out the setter methods. Yes o No
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- (JAVA) The use case description for the View Exam Grades use case is described below. Determineclasses that are needed to implement the use case. Also, define each class's attributes andmethods. Represent class and its attributes and methods using the UML class notation.Use case name: View Exam Grades.Summary: The student looks at his/her exam grade of CS2365 OOP or CS3365 SoftwareEngineering.Actor: StudentPrecondition: None.Main sequence:1. The student enters the student ID and password into the system.2. The system checks if the student ID and password are valid.3. The system displays the course numbers (e.g., CS2365 and CS3365) if the ID andpassword are valid.4. The customer chooses only a course to view the grade.5. The system displays the course grade to the student.Alternative sequence:Step 3: If the student's ID and password are invalid, the system displays an error messageand asks to enter another ID and password into the system. If the ID and password arevalid, the system…A1. Find the output of the following code in order. public class Faculty extends Employee ( E public static void main (String[) args) ( new Faculty () : System.out.println("GCood Luck") public Faculty () ( System.out.println(" Eaculty's no-arg constructor is invoked"): class Employee extends Person ( public Employee () ( System.ont.println( Employee's no-arg constructor is invoked") class Person ( public Person () ( this ("Invoke Person s overloaded constructor"); System.oub.println('Person s no-arg constructor is invoked"); public Person (String s) ( System.out.println(s) ロ(JAVA) What is the benefit of an abstract class? Group of answer choices A) There is a guarantee that all classes that inherit from the abstract class have the methods and fields of the abstract class. B) They cannot be instantiated, so you only need to write the code for the fields and methods that are common to all classes that extend it. You also need to initialize those fields in a constructor. C) All choices are correct. D) All classes that extend the abstract class will automatically inherit all the methods from the abstract classes without need to implement them again.
- Question 5 (6 marks) Given the following interface class interface Bigoperation { public Biglnteger operation (Biglnteger x, Biglnteger y); Write Lambda expressions to implement BigOperation to simulate three arithmetic operations *, / and % on Biglnteger. You can call them op1, op2 and op3 respectively. Note that the three operations in Biglnteger are called multiply, divide and remainder respectively. Using these three operations, we wish to multiply all the digits in a Biglnteger. For example, if the Biginteger is 234, the product is 2* 3*4 = 24. The method has the following method heading: static BigInteger product (Biglnteger n, BigOperation op1, BigOperation op2, BigOperation op3) Compare the implementation of this method using two approaches: Iterative and Recursive. Put the Lambda expressions in a main method. Construct a few Biglnteger objects, invoke the methods to test our design. The following shows some of the sample outputs:Can we pass parameters to base class constructor though derived class or * ?derived class constructor No Yes May Be O Can't Say O[JAVA] Question 4: Write the source code of the classes ReportCurrentRevenue and ReportPastIncome. The ReportCurrentRevenue class is responsible from calculating the current amount of money to be gained if all the guests would leave from the hotel. The ReportPastIncome class is responsible from calculating the money gained so far from the previous visits of guests. Class Hotel will create one instance of this class and execute it in multithreaded fashion in its report method. You will code Hotel.report in the next question. Question 5: Write the source code of only the following methods of the class Hotel. The explanations of the methods you need to code are given below. Don’t forget to address the multithreading issues when coding. report: The details of this method are given in Question 4. restore: This method loads the Hashtable members and LinkedList visits from the path given by the fileName parameter. However, if there are ongoing multithreaded operations, it must first wait…
- Q. Can I have a static method in a class that implements a data type?Instructions-Java Assignment is to define a class named Address. The Address class will have three private instance variables: an int named street_number a String named street_name and a String named state. Write three constructors for the Address class: an empty constructor (no input parameters) that initializes the three instance variables with default values of your choice, a constructor that takes the street values as input but defaults the state to "Arizona", and a constructor that takes all three pieces of information as input Next create a driver class named Main.java. Put public static void main here and test out your class by creating three instances of Address, one using each of the constructors. You can choose the particular address values that are used. I recommend you make them up and do not use actual addresses. Run your code to make sure it works. Next add the following public methods to the Address class and test them from main as you go: Write getters and…(Java) The Abstract Art Class Write an abstract class as follows: The class is named Art It inherits from the Comparable interface It has a private String member variable named name It has a private String member variable named artist It has a private int member variable called year It has a default constructor that assigns the values "No name" to name, "No artist" to artist and -1 to the year. This default constructor calls the three argument constructor. It has a three-argument constructor to assign values to the name, artist and year variables. It has a copy constructor that makes a copy of another non-null Art object It has getters and setters for the name, artist and year variables It has a toString() method that creates a string of artist, with name and year tabbed once on subsequent lines (see sample output) It has an equals method that compares this Art to another Object It has a compareTo method that compares in this order: 1) artist, 2) name, 3) year This class contains no…
- Explain when explicit casting is required when dealing with objects built from derived classes.Question: 2Implement the design of the Chillox and Customer classes so that the following code generates the output below:print(f"It's been a good day!. \nToday, we have already served {Chillox.order_id} customers.")print("**************************************************")outlet1 = Chillox()print("1.==========================================")print("Burger Menu:")print(Chillox.menu)print("2.==========================================")outlet1.addBurger("Chicken Burger",180,"Chicken with Cheese",200)print("3.==========================================")print("Burger Menu:")print(Chillox.menu)print("4.==========================================")c1 = Customer("Samin")c1.order = "2xChicken Burger"outlet1.placeOrderof(c1)print("5.==========================================")outlet1.addBurger('Chicken Smoky BBQ Cheese',225)c2 = Customer("Rafi")c2.setOrder("2xChicken with Cheese,3xChicken Smoky BBQ…g) Make a class Class (as in a class of students, not a class as in a class of objects) that stores several Student objects. Store a list of students in an attribute called students. The initializer method should initialize the class as an empty class (no students). Implement a method add_student() that takes an object of class Student and adds it to class. Implement method pass_rate() that determines the fraction of students that pass the class (have a grade of >= 6). python code!!
