Concept explainers
You hear someone make the following comment: "A blueprint is a design for a house. A carpenter can use the blueprint to build the house. If the carpenter wishes, he or she can build several identical houses from the same blueprint." Think of this as a metaphor for classes and objects. Does the blueprint represent a class, or does it represent an object?
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- Now we are going to use the design pattern for collecting objects. We are going to create two classes, a class AmazonOrder that models Amazon orders and a class Item that models items in Amazon orders. An item has a name and a price, and the name is unique. The Item class has a constructor that takes name and price, in that order. The class also has getters and setters for the instance variables. This is the design pattern for managing properties of objects. The setName() method should do nothing if the parameter is the empty string, and the setPrice() method should do nothing if the parameter is not positive. The class also has a toString() method that returns a string representation for the item in the format “Item[Name:iPad,Price:399.99]”. For simplicity, we assume an Amazon order can have at most 5 items, and class AmazonOrder has two instance variables, an array of Item with a length of 5 and an integer numOfItems to keep track of the number of items in the…arrow_forwardWAKA, WAKA. Pac-Man was a big hit back in the 80s. One of the things he could do was “teleport” from one side of the screen to the other, and that’s what we’re going to implement here. For this program, you’re going to write a class that only has two attributes: an X and Y location. Imagine the player is on a 10x10 grid. If the player exceeds the bounds of the screen, their location teleports to the other side of the screen (e.g. far-right players go to the far-left). The class should include methods for going up, down, left and right. Finally, you should make a “driver” that brings an instance of this class to life in the middle of the “screen” and enables the player to move up, down, left and right. Implement (source code) this program. C++ Pleasearrow_forwardSome programmers look at the code and decide to create relationships between classes. Is this recommended? Justify your answer by considering an example that should be presented and discussed. Answer:arrow_forward
- What is the difference between an object and a class? Give some examples.arrow_forwardThese two pictures are my resource and driver classes. Please, help me with the error in my resource class. I want my resource class to have getName, getSalary, getThePercentageThatTheEmployeeWantToRaise, and calculateTheNewSalary methods. For my driver class, I want the driver class to ask the user to input their name, salary, how much they want to raise, and print out their new salary.arrow_forwardI need to write a jave program to keep track of a team sport. Write a class, Team.java, that has the following: * two private instance variables: a String named color and an int named score. * a default constructor with no parameters that initializes color to "Red" and score to zero. * a constructor that takes two parameters (one for each instance variable) and sets the values of the instance variables. * a public getter and setter method for each instance variable. * a toString method that returns the color and score in the following format: "Red Team with 0 points."arrow_forward
- Can I get help with this question ?: write a simple Java class, CD, that models a Compact Disc. Part 1: basic setting up of the CD class The information stored about each CD will include its title, called title; the artist on the CD, called artist; the number of tracks on the CD, called numberOfTracks; the cost of the CD to the library, called costInPence. There should also be a constructor which allows you to pass arguments to initialise these four attributes in the order specified above. For this Part and Part 2, do not add extra parameters. accessor and mutator methods for each field, and a printReport() method which prints, to the terminal window, details of each field. Each piece of information must be printed on a separate line AND in the order given below AND using the exact format given below (though, of course, replacing these example values below with your own values): Title: Greatest Hits Artist: Queen Number of tracks: 12 Cost in pence: 1500 Note that…arrow_forwardWrite a Java program: In the board game Scrabble, each tile contains a letter, which is used to spell words in rows and columns, and a score, which is used to determine the value of words. The point of this exercise is to practice the mechanical part of creating a new class definition: Write a definition for a class named Tile that represents Scrabble tiles. The instance variables should be a character named "letter" and an integer named "value". Write a constructor that takes parameters named letter and value, and initializes the instance variables. Create getters for both of the attributes. (No setters, so that a Tile is immutable.) Implement the .toString() and .equals methods for a Tile.arrow_forwardGiven the following class diagram, interfaces and classes that model various kinds of animals. What will be the errors in the main method? For each error, indicate the line number of each incorrect statement and explain in one sentence why it is wrong.arrow_forward
- In python how do you: Complete the FoodItem class by adding a constructor to initialize a food item. The constructor should initialize the name to "None" and all other instance attributes to 0.0 by default. If the constructor is called with a food name, grams of fat, grams of carbohydrates, and grams of protein, the constructor should assign each instance attribute with the appropriate parameter value. The given program accepts as input a food item name, fat, carbs, and protein and the number of servings. The program creates a food item using the constructor parameters' default values and a food item using the input values. The program outputs the nutritional information and calories per serving for both food items. Ex: If the input is: M&M's 10.0 34.0 2.0 1.0 where M&M's is the food name, 10.0 is the grams of fat, 34.0 is the grams of carbohydrates, 2.0 is the grams of protein, and 1.0 is the number of servings, the output is: Nutritional information per serving of None:…arrow_forwardConsider the following diagram that details the classes Circle and Cylinder. The second row for each box (class) represents the data member (characteristics) of the classes and the third row lists the methods, including constructors, (behavior) of the classes. (Please note that -/+ sign represents private and public modifiers respectively.) Create these two classes, with class Cylinder inheriting the class Circle. Also, using your newly created classes, write a program that asks the user to input the radius and height of a cylinder and prints its surface area and volume.arrow_forwardFirst, you need to design, code in Java, test and document a base class, Student. The Student class will have the following information, and all of these should be defined as Private: A first name (given name) A last name (family name/surname) Student number (ID) – an integer number (of type long) The Student class will have at least the following constructors and methods: (i) two constructors - one without any parameters (the default constructor), and one with parameters to give initial values to all the instance variables of Student. (ii) only necessary set and get methods for a valid class design. (iii) a reportGrade method, which you have nothing to report here, you can just print to the screen a message “There is no grade here.”. This method will be overridden in the respective child classes. (iv) an equals method which compares two student objects and returns true if they have the same student number (ID), otherwise it returns false. You may add other…arrow_forward
- Microsoft Visual C#Computer ScienceISBN:9781337102100Author:Joyce, Farrell.Publisher:Cengage Learning,C++ Programming: From Problem Analysis to Program...Computer ScienceISBN:9781337102087Author:D. S. MalikPublisher:Cengage Learning