Concept explainers
Circle Class
Write a Circle class that has the following fields:
- radius: a double
- PI: a final double initialized with the value 3.14159
The class should have the following methods:
- Constructor. Accepts the radius of the circle as an argument.
- Constructor. A no-arg constructor that sets the radi us field to 0.0.
- setRadius. A mutator method for the radius field.
- GetRadius. An accessor method for the radius field.
- area. Returns the area of the circle, which is calculated as
area = PI * radius * radius
- diameter. Returns the diameter of the circle, which is calculated as
diameter = radius * 2
- circumference. Returns the circumference of the circle, which is calculated as
circumference = 2 * PI * radius
Write a
Learn your wayIncludes step-by-step video
Chapter 6 Solutions
Starting Out with Java: From Control Structures through Objects (7th Edition) (What's New in Computer Science)
Additional Engineering Textbook Solutions
Differential Equations: Computing and Modeling (5th Edition), Edwards, Penney & Calvis
Java: An Introduction to Problem Solving and Programming (8th Edition)
Problem Solving with C++ (10th Edition)
Starting out with Visual C# (4th Edition)
C How to Program (8th Edition)
C Programming Language
- Car ClassWrite a class named Car that has the following fields:• yearModel. The yearModel field is an int that holds the car’s year model.• make. The make field references a String object that holds the make of the car.• speed. The speed field is an int that holds the car’s current speed. In addition, the class should have the following constructor and other methods.• Constructor. The constructor should accept the car’s year model and make as arguments. These values should be assigned to the object’s yearModel and make fields. The constructor should also assign 0 to the speed field.• Accessors. Appropriate accessor methods should get the values stored in an object’s yearModel, make, and speed fields.• accelerate. The accelerate method should add 5 to the speed field each time it is called.• brake. The brake method should subtract 5 from the speed field each time it is called.Demonstrate the class in a program that creates a Car object, and then calls the accelerate method five…arrow_forwardTemp Class - Create Temp class whos job is to hold a temp in degrees F and gives methods to get the temp in F, Celsius, and Kelvin. The class should follow the instance variable (field): ftemp (double type that holds F temp)Follow these methods with the class.. Constructor --Will accept Fahrenheit temperature as a double to store it in the ftemp field. setFahrenheit - The setFahrenheit method accepts a Ftemperature as a doubleto stores it in the ftemp field. getFahrenheit - Returns the value of the ftemp field, as a Fahrenheit temperature (no conversion required). getCelsius - Returns the value of the ftemp field converted to Celsius. [C e l s i u s = ( 5.0 / 9.0 ) × ( F a h r e n h e i t − 32 )] getKelvin - Returns the value of the ftemp field converted to Kelvin. [K e l v i n = ( ( 5.0 / 9.0 ) × ( F a h r e n h e i t − 32 ) ) + 273] Exemplify the temp class by writing a (test) program that is separate and promotes users for an F Fahrenheit temp. The program must create an…arrow_forwardBuild a class named car. This class is defined as follows: It has the fields: Car ID, Car model , Car make, Car color, Car year. Build a constructor that accepts the five parameters (Car ID, Car model , Car make,Car color, Car year). Override the method toString() to return the string representation of Car ID, Carmodel , Car make, Car color, Car year.arrow_forward
- JAVA PROGRAMMING: Lesson – Overloading Constructors Create a class named House that includes data fields for the number of occupants and the annual income as well as methods named setOccupants(), setIncome(), getOccupants() and getIncome() that set and return those values respectively. Additionally, create a constructor that requires no arguments and automatically sets the occupants field to 1 and income field to 0. Create an additional overloaded constructor . This constructor receives an integer argument and assigns the value to the occupants field. Create a third overloaded constructor this time, the constructor receives 2 arguments, the values of which are assigned to the occupants and income fields respectively. Create another class named I_house that instantiates the House class and see if the constructors work correctly.arrow_forwardDesign a LandTract class that has two fields (i.e. instance variables): one for the tract’s length(a double), and one for the width (a double). The class should have: a constructor that accepts arguments for the two fields a method that returns the tract’s area(i.e. length * width) an equals method that accepts a LandTract object as an argument. If the argument object holds the same data (i.e. length and width) as the calling object, this method should return true. Otherwise, it should return false. a toString method (that returns a String representation of the tract’s length, width, and area). Demonstrate the class in a program by creating an array of three LandTract objects initialized with user input. Then, print the info of the LandTract objects stored in the array by invoking the toString method (implicitly or explicity). Also, use the equals method to compare at least two LandTract objects and print wether they are of equal size or not. Sample Output:…arrow_forwardFreezing and Boiling PointsThe following table lists the freezing and boiling points of several substances.Substance Freezing Point || Boiling PointEthyl Alcohol -173 || 172Oxygen -362 || -306Water 32 || 212Design a class that stores a temperature in a temperature field and has the appropriate accessor and mutator method for the field. In addition to appropriate constructors, the class should have the following methods:• isEthylFreezing. This method should return the boolean value true if the tempera-ture stored in the temperature field is at or below the freezing point of ethyl alcohol. Otherwise, the method should return false.• isEthylBoiling. This method should return the boolean value true if the tempera-ture stored in the temperature field is at or above the boiling point of ethyl alcohol. Otherwise, the method should return false.• isOxygenFreezing. This method should return the boolean value true if the tem-perature stored in the temperature field is at or below the freezing…arrow_forward
- Exercise 1-Account class • Design a class named Account that contains : • A private int data field named id for the account • A private double data field named balance for the account • A privet Date data field named dateCreated that stores the date when the account was created • A no-arg constructor that creates a default account • A constructor that creates an account with the specified id and initial balance • The getters (i.e., accessors) and setters (i.e., mutators) methods for id and balance • The getter method for dateCreated • A method named withdraw that withdraws a specified amount from the account • A method named deposit that deposits a specified amount to the accountarrow_forwardCreate a class Employee a) private and static field nextAvailableID (int): create a static constructor to initialize this field to a random number (hint: you can use Random class). You can assume that IDs are numbers between 1-9999. Since nextAvailableID is static, all the Employee objects will share this field. b) with properties FirstName (string) LastName (string), ID (int): make it read only to allow initializing only with a constructor and then no more. c) Add a constructor to allow setting properties FirstName and LastName. Hint: ID will be initialized to nextAvailableID (make sure to increment nextAvailableID by one) Add ToString Method to display the full name and ID of the employee Then, write a Main method to test your class Employee. Create four Employee objects with references e1, e2, and e3 by providing first and last name of each employee Display the full name and id of each employee - note that each employee will have an automatically generated ID…arrow_forwardCircle Class (Easy) Write a Circle class that has the following member variables: radius : a double The class should have the following member functions: Default Constructor: default constructor that sets radius to 0.0. Constructor: accepts the radius of the circle as an argument. setRadius: an mutator function for the radius variable. getRadius: an accessor function for the radius variable. getArea: returns the area of the circle, which is calculated as area = pi * radius * radius getCircumference: returns the circumference of the circle, which is calculated as circumference = 2 * pi * radius Step1: Create a declaration of the class. Step2: Write a program that demonstrates the Circle class by asking the user for the circle’s radius, creating Circle objects, and then reporting the circle’s area, and circumference. You should create at least two circle objects, one sets the radius to 0.0 and one accepts the radius as an…arrow_forward
- JAVA - USING CONSTRUCTORS Create a class named House that includes data fields for the number of occupants and the annual income as well as methods named setOccupants(), setIncome(), getOccupants() and getIncome() that set and return those values respectively. Additionally, create a constructor that requires no arguments and automatically sets the occupants field to 1 and income field to 0. Create an additional overloaded constructor . This constructor receives an integer argument and assigns the value to the occupants field. Create a third overloaded constructor this time, the constructor receives 2 arguments, the values of which are assigned to the occupants and income fields respectively. Create another class named I_house that instantiates the House class and see if the constructors work correctly.arrow_forwardDefine a class named Employee. This class should extend the Person class from the previous question. The class should have a constructor, which takes the name, age, employer (String) and salary (int) as parameters (in that order). The first two parameters should be passed to the constructor of the superclass and the value of the last two parameters should be stored in instance variables. The class should define the methods, getSalary which returns the salary of the employee and getEmployer which returns the name of the employer. Any methods from the previous question that need to be overridden should be overridden! Use super and instanceof as appropriate. I.e., for the following methods you should be able to call the method in the superclass for specific situations (e.g. the compareTo method in the superclass can be called if you receive anything other than an Employee, and this also holds for the equals method). The toString method only needs to append details and as such can also…arrow_forwardDesign a Class You’ll design a class named Car that has the following fields: yearModel—An Integer that holds the car’s model year make—A String that holds the make of the car speed—An Integer that holds the car’s current speed The class should have the following constructor and other methods: The constructor should accept the car’s model year and make as arguments. These values should be assigned to the object’s yearModel and make fields. The constructor should also assign 0 to the speed field. Design appropriate accessor methods to get the values stored in an object’s yearModel, make, and speed fields. The accelerate method should add 5 to the speed field each time it’s called. The brake method should subtract 5 from the speed field each time it’s called. Part 2: Design a Program You’ll create both pseudocode and a flowchart to design a program that creates a Car object and then calls the accelerate method five times. Then, call the brake method five times. After each call to the…arrow_forward
- Microsoft Visual C#Computer ScienceISBN:9781337102100Author:Joyce, Farrell.Publisher:Cengage Learning,EBK JAVA PROGRAMMINGComputer ScienceISBN:9781337671385Author:FARRELLPublisher:CENGAGE LEARNING - CONSIGNMENT