Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
expand_more
expand_more
format_list_bulleted
Related questions
Question
In this lab, you will create a programmer-defined class and then use it in a Java program. The program should create two Rectangle objects and find their area and perimeter.
Instructions
- Make sure the class file named Rectangle.java is open.
- In the Rectangle class, create two private attributes named length and width. Both length and width should be data type double.
- Write public set methods to set the values for length and width.
- Write public get methods to retrieve the values for length and width.
- Write a public calculateArea()method and a public calculatePerimeter() method to calculate and return the area of the rectangle and the perimeter of the rectangle.
- Open the file named MyRectangleClassProgram.java.
- In the MyRectangleClassProgramclass, create two Rectangle objects named rectangle1 and rectangle2.
- Set the length of rectangle1 to 10.0 and the width to 5.0. Set the length of rectangle2 to 7.0 and the width to 3.0.
- Print the value of rectangle1’s perimeter and area, and then print the value of rectangle2’s perimeter and area.
- Execute the program.
// This program uses the programmer-defined Rectangle class.
public class MyRectangleClassProgram
{
publicstaticvoidmain(Stringargs[])
{
// Create rectangle1 and rectangle2 objects here.
Rectangle rectangle1=newRectangle();
Rectangle rectangle2=newRectangle();
// Set the length of rectangle1 to 10.0 here.
rectangle1.setLength(10.0);
// Set the width of rectangle1 to 5.0 here.
rectangle1.setWidth(5.0);
// Print the area and perimeter of rectangle1 here.
System.out.println("Area of rectangle1: "+rectangle1.calculateArea());
System.out.println("Perimeter of rectangle1: "+rectangle1.calculatePerimeter());
// Set the length of rectangle2 to 7.0 here.
rectangle2.setLength(7.0);
// Set the width of rectangle2 to 3.0 here.
rectangle2.setWidth(3.0);
// Print the area and perimeter of rectangle2 here.
System.out.println("Area of rectangle2: "+rectangle2.calculateArea());
System.out.println("Perimeter of rectangle2: "+rectangle2.calculatePerimeter());
System.exit(0);
}
}
Expert Solution
This question has been solved!
Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.
This is a popular solution
Trending nowThis is a popular solution!
Step by stepSolved in 3 steps with 1 images
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, computer-science and related others by exploring similar questions and additional content below.Similar questions
- In python, must have docstrings Thank youarrow_forwardIn java language Class Design – Date V0.0 & V1.0 Create a new project for this lab and create a new class inside called Date. If you created a Date class last week, you may use it as a base. What does it mean to be a Date? What data items (called “state”) do you need to keep track of? Alternatively, what does a date have? (“has a” == composition) What can a Date do? What are the actions and verbs that can be applied to a date? Come up with one or two. These become the class’s methods. Try adding 3 data items to your Date to manage the month, day and year. Should these be local variables? Class-level (or instance) variables? Now let’s build a method to set the date This function should take 3 integers as input and assign these to your instance variables declared in the previous step. public void setDate(int m, int d, int y) { And, let’s build a method to report the date This function takes no input and uses the console to output the Date in the format…arrow_forwardDescription is " A MathVector object will be passed to your method. Return its contents as a String. If you look in the file MathVector.java you'll see there is a way to output the contents of a MathVector object as a String. This makes it useful for displaying to the user. You might have noticed that there's an @override term there. That's because many objects already have a "toString()" method associated with them... because Java was designed to include them by default. Here, the override tells Java "I know, I know. You already have a toString() that you'd assign here. But it's not good enough. Here's a better one for this particular kind of object." It's a little bit like saying "Most humans have two legs. So, by default, I'll give everyone two legs. But sometimes we override that and give no legs, or just one leg to a person. And sometimes we give them four so that they can be a centaur!" To use this in a println() method, just name your object. The toString()…arrow_forward
- In Java Write a Fraction class that implements these methods:• add ─ This method receives a Fraction parameter and adds the parameter fraction to thecalling object fraction.• multiply ─ This method receives a Fraction parameter and multiplies the parameterfraction by the calling object fraction.• print ─ This method prints the fraction using fraction notation (1/4, 21/14, etc.)• printAsDouble ─ This method prints the fraction as a double (0.25, 1.5, etc.)• Separate accessor methods for each instance variable (numerator , denominator ) in theFraction classProvide a driver class (FractionDemo) that demonstrates this Fraction class. The driver class shouldcontain this main method : public static void main(String[] args) { Scanner stdIn = new Scanner(System.in); Fraction c, d, x; // Fraction objects System.out.println("Enter numerator; then denominator."); c = new Fraction(stdIn.nextInt(), stdIn.nextInt()); c.print(); System.out.println("Enter numerator; then denominator."); d = new…arrow_forwardThe Object data type (and those related to it like Function and Date) is the only JavaScript data type that has methods. True or False (Include valid reason)arrow_forwardWrite a Java class named PhoneRecord.java that performs the following functions: The class should contain the following data attributes and methods: private String name - The customer's name private String number - The customer's phone number public PhoneRecord(String personName, String phoneNumber) - Constructor get/set Methods - For each data attribute public String toString( ) - Special method to be used when printing a phoneRecord object Thank you so much for your help. Trying to write this class has really been stumping me.arrow_forward
- In Java Write a Fraction class that implements these methods:• add ─ This method receives a Fraction parameter and adds the parameter fraction to thecalling object fraction.• multiply ─ This method receives a Fraction parameter and multiplies the parameterfraction by the calling object fraction.• print ─ This method prints the fraction using fraction notation (1/4, 21/14, etc.)• printAsDouble ─ This method prints the fraction as a double (0.25, 1.5, etc.)• Separate accessor methods for each instance variable (numerator , denominator ) in theFraction classProvide a driver class (FractionDemo) that demonstrates this Fraction class. The driver class shouldcontain this main method : public static void main(String[] args) { Scanner stdIn = new Scanner(System.in); Fraction c, d, x; // Fraction objects System.out.println("Enter numerator; then denominator."); c = new Fraction(stdIn.nextInt(), stdIn.nextInt()); c.print(); System.out.println("Enter numerator; then denominator."); d = new…arrow_forwardMake any necessary modifications to the RushJob class so that it can be sorted by job number. Modify the JobDemo3 application so the displayed orders have been sorted. Save the application as JobDemo4. An example of the program is shown below: Enter job number 22 Enter customer name Joe Enter description Powerwashing Enter estimated hours 4 Enter job number 6 Enter customer name Joey Enter description Painting Enter estimated hours 8 Enter job number 12 Enter customer name Joseph Enter description Carpet cleaning Enter estimated hours 5 Enter job number 9 Enter customer name Josefine Enter description Moving Enter estimated hours 12 Enter job number 21 Enter customer name Josefina Enter description Dog walking Enter estimated hours 2 Summary: RushJob 6 Joey Painting 8 hours @$45.00 per hour. Rush job adds 150 premium. Total price is $510.00 RushJob 9 Josefine Moving 12 hours @$45.00 per hour. Rush job adds 150 premium. Total price is $690.00 RushJob 12 Joseph Carpet cleaning 5 hours…arrow_forwardIn python and include doctring: First, write a class named Movie that has four data members: title, genre, director, and year. It should have: an init method that takes as arguments the title, genre, director, and year (in that order) and assigns them to the data members. The year is an integer and the others are strings. get methods for each of the data members (get_title, get_genre, get_director, and get_year). Next write a class named StreamingService that has two data members: name and catalog. the catalog is a dictionary of Movies, with the titles as the keys and the Movie objects as the corresponding values (you can assume there aren't any Movies with the same title). The StreamingService class should have: an init method that takes the name as an argument, and assigns it to the name data member. The catalog data member should be initialized to an empty dictionary. get methods for each of the data members (get_name and get_catalog). a method named add_movie that takes a Movie…arrow_forward
- Objectives: Use Javadocs to document a class and methods Design and write a Java class Use fields (instance variables) Write multiple constructors Write accessor methods Write mutator methods Use the this keyword Use string concatenation Round floating point numbers (using Math.round()) Use a Scanner object Description ProduceItem class For this project, you get to design and write a ProduceItem class that stores a description, cost and weight as fields. Include both a constructor without any parameters and one with parameters for the description (String), cost (double) and weight (double) (in that order). For the constructor without parameters, set the description to an empty string, the cost to 0.0 and the weight to 0.0. Include appropriate accessor and mutator methods (and label them with comments including the terms "accessor" or "mutator"). So that the test cases compile, name the accessor methods: getDescription() getCost() getWeight() Additionally, name the mutator methods:…arrow_forwardPythonarrow_forwardDesign a class in python named Book that holds a stock number, author, title, price, and number of pages. Include methods to set and get the values for each data field. Also include a displayInfo() method that displays each of the Book's data fields with explanations.Design a class named TextBook that is a child class of Book. Include a new data field for the grade level of the book. Override the Book class displayInfo() method to accommodate the new grade-level field.arrow_forward
arrow_back_ios
arrow_forward_ios
Recommended textbooks for you
- Database System ConceptsComputer ScienceISBN:9780078022159Author:Abraham Silberschatz Professor, Henry F. Korth, S. SudarshanPublisher:McGraw-Hill Education
Starting Out with Python (4th Edition)Computer ScienceISBN:9780134444321Author:Tony GaddisPublisher:PEARSON
Digital Fundamentals (11th Edition)Computer ScienceISBN:9780132737968Author:Thomas L. FloydPublisher:PEARSON 
C How to Program (8th Edition)Computer ScienceISBN:9780133976892Author:Paul J. Deitel, Harvey DeitelPublisher:PEARSON
Database Systems: Design, Implementation, & Manag...Computer ScienceISBN:9781337627900Author:Carlos Coronel, Steven MorrisPublisher:Cengage Learning
Programmable Logic ControllersComputer ScienceISBN:9780073373843Author:Frank D. PetruzellaPublisher:McGraw-Hill Education
Database System Concepts
Computer Science
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:McGraw-Hill Education
Starting Out with Python (4th Edition)
Computer Science
ISBN:9780134444321
Author:Tony Gaddis
Publisher:PEARSON
Digital Fundamentals (11th Edition)
Computer Science
ISBN:9780132737968
Author:Thomas L. Floyd
Publisher:PEARSON
C How to Program (8th Edition)
Computer Science
ISBN:9780133976892
Author:Paul J. Deitel, Harvey Deitel
Publisher:PEARSON
Database Systems: Design, Implementation, & Manag...
Computer Science
ISBN:9781337627900
Author:Carlos Coronel, Steven Morris
Publisher:Cengage Learning
Programmable Logic Controllers
Computer Science
ISBN:9780073373843
Author:Frank D. Petruzella
Publisher:McGraw-Hill Education