6. (Immutable Data Class Objects) Built-in types int, float, str and tuple are immutable. Data classes can simulate immutability by designating that objects of the class should be "frozen" after they're created. Client code cannot assign values to the attributes of a frozen object. Research "frozen" data classes, then reimplement this chapter's Complex class as a "frozen" data class. Show that you cannot modify a Complex object after you create it.

6. (Immutable Data Class Objects) Built-in types int, float, str and tuple are immutable. Data classes can simulate immutability by designating that objects of the class should be "frozen" after they're created. Client code cannot assign values to the attributes of a frozen object. Research "frozen" data classes, then reimplement this chapter's Complex class as a "frozen" data class. Show that you cannot modify a Complex object after you create it.

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

See similar textbooks

Similar questions

(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…
(Writing Java code)
(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:
[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…
C++ Exercise 2 (inheritance):Consider a circle class that has a single attribute R (radius).1. Write a program that allows you to create this class that contains:o A single attribute.o A default constructor that initializes R to 1.o A parameterized constructor.2. Create another cylinder class that inherits the circle class publicly. Theclass cylinder contains:o A single H (Height) attribute.o A parameterized constructor.o A member function to calculate and display the volume of the cylinder.
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…
Can you write in C++
* Lab Objectives: > To understand the use of static variables and methods. > To understand visibility modifiers and data field encapsulation. > To pass and return objects from methods. > To read input from the console. You should define each class in a separate file. * Implement the following class named Item with the following UML diagram: Item + name: String - reviews: String[] priceWithoutTax: double ·salesTax: double= 0.16 + Item( ) + getReviews(): String[] + addReview(): void + getPriceWithoutTax(): double + setPriceWithoutTax(price: double): void + getSalesTax(): double + setSalesTax(tax:double): void + getPriceWithTax():double + printReviews():void The no-arg constructor should read the name and price without tax of the item from the user, and initialize the reviews array with 0 elements. Note that the constructor should only accept positive nonzero values for the price and keep on asking the user to enter a valid value if he enters an invalid value. The method addReview should…