Objects First with Java: A Practical Introduction Using BlueJ (6th Edition)
6th Edition
ISBN: 9780134477367
Author: David J. Barnes, Michael Kolling
Publisher: PEARSON
expand_more
expand_more
format_list_bulleted
Videos
Textbook Question
Chapter 1, Problem 17E
Add a second sun to the picture. To do this, pay attention to the field definitions close to the top of the class. You will find this code:
You need to add a line here for the second sun. For example:
Then write the appropriate code in two different places for creating the second sun and making it visible when the picture is drawn.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
OBAFGKM are the seven categories that are used to describe the absorption lines of a spectrum.
Access the Spectral Types Color Slider by opening the Eclipsing Binary Stars section of the NAAP Labs Application and then the Spectral Types of Stars subsection (it is the last simulation on the page) and use it to complete the data table below.
Spectral Type: include a letter and a number (no space).
Temperature: Kelvin (K) is assumed for Temperature.
Color: choose from Blue, White, Orange, or Red (spelling counts!).
Please do P1 by redefining and using the student.py code. Strictly use the student.py code, you can change and add some code but you have to use it to create P1. Thanks a lot!
P1: Add three methods to the Student class that compare two Student objects. One method should test for equality. A second method should test for less than. The third method should test for greater than or equal to. In each case, the method returns the result of the comparison of the two students’ names. Include a main function that tests all of the comparison operators.
***student.py***
"""File: student.pyResources to manage a student's name and test scores."""
class Student(object): """Represents a student."""
def __init__(self, name, number): """All scores are initially 0.""" self.name = name self.scores = [] for count in range(number): self.scores.append(0)
def getName(self): """Returns the student's name.""" return self.name def…
Every circle has a center and a radius. Given the radius, we can determine the circle’s area and circumference. Given the center, we can determine its position in the x-y plane. The center of the circle is a point in the x-y plane. Design a class, circleType, that can store the radius and center of the circle.Because the center is a point in the x-y plane and you designed the class to capture the properties of a point. you must derive the class circleType from the class pointType. You should be able to perform the usual operations on the circle, such as setting the radius, printing the radius, calculating and printing the area and circumference, and carrying out the usual operations on the center. Also, write a program to test various operations on a circle.
Note:
use c++ language
solve as soon as possible
explain by double linne comments
Chapter 1 Solutions
Objects First with Java: A Practical Introduction Using BlueJ (6th Edition)
Ch. 1 - Prob. 1ECh. 1 - Prob. 2ECh. 1 - Prob. 3ECh. 1 - Prob. 4ECh. 1 - This is a very simple example, and not many colors...Ch. 1 - Prob. 6ECh. 1 - Prob. 7ECh. 1 - Prob. 8ECh. 1 - Prob. 9ECh. 1 - Select Show Terminal from the View menu. This...
Ch. 1 - Select Show Code Pad from the View menu. This...Ch. 1 - Prob. 12ECh. 1 - Prob. 13ECh. 1 - Prob. 14ECh. 1 - Look at the pop-up menu of class Picture again....Ch. 1 - In the source code of class Picture, find the part...Ch. 1 - Add a second sun to the picture. To do this, pay...Ch. 1 - Prob. 18ECh. 1 - Prob. 19ECh. 1 - Prob. 20ECh. 1 - Create an object of class Student. You will notice...Ch. 1 - Prob. 22ECh. 1 - Prob. 23ECh. 1 - Call the numberOfStudents method of that class....Ch. 1 - Look at the signature of the enrollStudent method....Ch. 1 - Prob. 26ECh. 1 - Prob. 27ECh. 1 - Prob. 28ECh. 1 - Prob. 29ECh. 1 - In this chapter we have mentioned the data types...Ch. 1 - What are the types of the following values?...Ch. 1 - Prob. 32ECh. 1 - Write the header for a method named send that has...Ch. 1 - Prob. 34ECh. 1 - Prob. 35ECh. 1 - Prob. 36E
Additional Engineering Textbook Solutions
Find more solutions based on key concepts
a. In what way are general-purpose registers and main memory cells similar? b. In what way do general-purpose r...
Computer Science: An Overview (12th Edition)
Course Grades In a course, a teacher gives the following tests and assignments: A lab activity that is observed...
Starting Out with Java: Early Objects (6th Edition)
Write a function with the following prototype: / Determine whether arguments can be subtracted without overflow...
Computer Systems: A Programmer's Perspective (3rd Edition)
Give an example of a data constraint.
Database Concepts (7th Edition)
Write a program segment with a do-while loop that displays whether a user-entered integer is even or odd. The c...
Starting Out with C++: Early Objects (9th Edition)
The ____________ is always transparent.
Web Development and Design Foundations with HTML5 (9th Edition) (What's New in Computer Science)
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
- Create the VisualCounter class, which supports both increment and decrement operations. Take the constructor's two arguments N and max, where N indicates the maximum operation number and max specifies the counter's maximum absolute value. Make a plot that displays the value of the counter each time its tally changes as a byproduct.arrow_forwardIN JAVA LANGUAGE Write an ATM class with an ArrayList of Account objects as an attribute. In the constructor, add 3 Account objects to your ArrayList. They can all have a start balance of $100 and an annual interest rate of 0.12. Include two methods, menu and makeSelection as outlined below. Please note that since both methods get user input, create a Scanner attribute to use in both. menu method This method does not have any parameters and does not return a value. It should: Get the account number from the user. This corresponds to the index of the items in the ArrayList. Since there are 3 elements in your ArrayList, you are going to ask them for a number between 1 and 3, but keep in mind that the indices of the ArrayList are 0-2, so you'll have to adjust the value you get from the user accordingly. Present the user with a main menu as shown below: Get their menu selection Call the makeSelection method, passing it the account index obtained in step 1 and the menu selection…arrow_forwardIt's time for the opening quidditch match of the season! We represent the various positions for players with the QuidditchPlayer class and its subclasses. Every player begins with a base_energy level, but every position requires a different proportion of energy. Fill in the energy method for the Beater, Chaser, Seeker, and Keeper classes, according to their docstrings. In addition, fill in the init____ method for the Chaser class. class Beater (QuidditchPlayer): role="bludgers" def energy (self, time): ****** Returns the amount of energy left after playing for time minutes. After playing for time minutes, Beaters lose their base energy level divided by the number of minutes. If time is 0, catch the ZeroDivisionError and print "You can't divide by zero!" instead. >>> fred Beater ("Fred Weasley", 640) >>> fred.energy (40) 624.0 >>> fred.energy (0) You can't divide by zero! ***** "***** YOUR CODE HERE *****" Use OK to test your code: python3 ok -q Beater.energy class Chaser…arrow_forward
- In this assignment, you will need to add a new method to the Date class, which you can find on D2L in the "Sample Code" section. The new method should make a Date object's day, month, and year value change to the next day. In other words, add one day to the object's current date. Do not use any part of the built-in DateTime class, but you may want to use the DaysInMonth() method from the Date class. Examples: • If the Date object stores the date 12/31/2021, then after calling your method it should store the date 1/1/2022 • If the Date object stores the date 2/28/2022, then after calling your method it should store the date 3/1/2022 As noted in the common instructions, you only need to turn in your new method, not the entire Date class.arrow_forwardCreate two enumerations that hold colors and car modeltypes. You will use them as field types in a Car class and write ademonstration program that shows how the enumerations are used.arrow_forwardAdd a toString method to your Account class. For the purposes of this assignment, please use the toString display the following: This account contains $x. You have earned $y in the last month. where x is the account balance (please don't format the decimals) and y is the monthly interest earned, obtained from the getMonthlyInterest method. Compile and test in a driver by creating and printing an Account object. Add an equals method to your Account class. Two Account objects are equal if their balance and annualInterestRates are equal. Compile and test in your driver by creating 2 Account objects to see if they are equal.arrow_forward
- For this lab task, you will work with classes and objects. Create a class named text that works similar to the built-in string class. You will need to define a constructor that can be used to initialize objects of this new class with some literal text. Next, define three methods: to_upper() that will convert all characters to uppercase, reverse() that will reverse the text and length() that will return the length of the text. After you have completed this part, copy the following mainfunction to your code and check if the implementation is correct. int main() { text sample = "This is a sample text"; cout << sample.to_upper(); // This should display "THIS IS A SAMPLE TEXT" cout << endl;cout << sample.reverse(); // This should display "txet elpmas a si sihT"cout << endl; cout << sample.length(); // This should display 21 }arrow_forwardFor this assignment, you are asked to create a ColorfulBouncingCircle class. ColorfulBouncingCircle should extend ColorfulCircle. Unlike the other Circle classes, it will include a velocity for the x and y axes. The constructor for ColorfulBouncingCircle includes these parameters:public ColorfulBouncingCircle(double radius, double centerX, double centerY, Color color, double xVelocity, double yVelocity) Note that we are treating x as increasing to the right and y as increasing down, as with Java’s graphics coordinates system. This was also seen with Circle’s draw method. ColorfulBouncingCircles will bounce around in a playing field which the tester will provide. The ColorfulBouncingCircle class should have a public static method to set the playing field width and height: public static void setPlayingFieldSize(double newWidth, double newHeight) ColorfulBouncingCircle will also include a method which should alter its centerX and centerY with each time tick (similar to a metronome’s…arrow_forwardWrite a program that asks the user for two points (x, y) and use them to create two Point2D objects. Then, use the methods in the Point2D class to determine and display the distance between the two points and the midpoint between the two points.arrow_forward
- I think you forgot to apply encapsulation in classes where every data is editablearrow_forwardYou will create a couple of classes that could be used to create a Text Adventure game. The class will be called "Item" and will represent an item in the game that can be carried and used by a player (such as a weapon or a tool). The Item Class The Item class will have only one property: A string description. The Item class will have exactly 3 methods: There will be a default constructor that takes no parameters. This constructor will give a generic, default description of the Item. There will be a constructor that takes a string parameter, and it will initialize the Item's description based on the parameter. There will be a method called "print" that will print the Item's description to standard output. PLEASE MAKE SURE ITS POSSIBLE TO COMPILE WITH THIS CODE. THANKS. #include "Item.h" #include <iostream> #include <string> using namespace std; int main() { Item sword("Sword of Destiny"); Item potion("Healing Potion"); Item key("Key of Wisdom"); string name; cout…arrow_forwarda. Carly's Catering provides meals for parties and special events. In Chapters 3 and 4, you created an Event class for the company. Now, make the following changes to the class: Currently, the class contains a field that holds the price for an Event. Now add another field that holds the price per guest, and add a public method to return its value. Currently, the class contains a constant for the price per guest. Replace that field with two fields—a lower price per guest that is $32, and a higher price per guest that is $35. Add a new method named isLargeEvent() that returns true if the number of guests is 50 or greater and otherwise returns false. Modify the method that sets the number of guests so that a large Event (more than 50 guests) uses the lower price per guest to set the new pricePerGuest field and calculate the total Event price. A small Event uses the higher price. Save the file as Event.java. b. In Chapter 4, you modified the EventDemo class to demonstrate two Event…arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
EBK JAVA PROGRAMMINGComputer ScienceISBN:9781337671385Author:FARRELLPublisher:CENGAGE LEARNING - CONSIGNMENT
EBK JAVA PROGRAMMING
Computer Science
ISBN:9781337671385
Author:FARRELL
Publisher:CENGAGE LEARNING - CONSIGNMENT
Memory Management Tutorial in Java | Java Stack vs Heap | Java Training | Edureka; Author: edureka!;https://www.youtube.com/watch?v=fM8yj93X80s;License: Standard YouTube License, CC-BY