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
Question
Chapter 4, Problem 40E
Program Plan Intro
To define a field for the type ArrayList within the club that is intended to store the objects of membership.
Write a program in BlueJ using Java and achieve the target of storing membership objects in a collection. Also, to use appropriate import statement for the same to use the collection.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solutionStudents have asked these similar questions
Q2 Create MusicOrganizer project using BlueJ .
(i) Create a MusicOrganizer class and declare an ArrayList for storing the file
names of music files into the String object.
(ii) Create a constructor for the music organizer class and assign the field to the
ArrayList.
(iii) Write a method to add a file to the collection.
(iv) Write a method to return the number of files in the collection.
(v) Write a method to remove a file from the collection.
(vi) Make a screen shot of the coding and output.
It is time for you to demonstrate your skills in a project of your own choice. You must DESIGN,ANALYSE AND CODE any method for the GENERIC MyLinkedList class that will manipulate the linkedlist. You can decide yourself what it should be following the specification below:1. Purpose: The method must make logical sense – it should be of some purpose to somebody.You should describe in the text who will use the method for which purpose.2. Clearly explain the problem. Then clearly explain how your method will solve it.3. Test program: Test the method using a wrapped class like Integer however, you will get extramarks if you can test it with the new classes you created in I_Do1 and I_Do2.
It is time for you to demonstrate your skills in a project of your own choice. You must DESIGN,ANALYSE AND CODE any method for the GENERIC MyLinkedList class that will manipulate the linkedlist. You can decide yourself what it should be following the specification below:1. Purpose: The method must make logical sense – it should be of some purpose to somebody.You should describe in the text who will use the method for which purpose.2. Clearly explain the problem. Then clearly explain how your method will solve it.3. Test program: Test the method using a wrapped class like Integer wrapper class.
All of this must be done using generic linked lists, and coded in java.
Chapter 4 Solutions
Objects First with Java: A Practical Introduction Using BlueJ (6th Edition)
Ch. 4 - Prob. 1ECh. 4 - What happens if you create a new MusicOrganizer...Ch. 4 - Prob. 3ECh. 4 - Prob. 4ECh. 4 - Write a declaration of a local variable called...Ch. 4 - Prob. 6ECh. 4 - Write assignments to the library, cs101. and track...Ch. 4 - If a collection stores 10 objects, what value...Ch. 4 - Write a method call using get to return the fifth...Ch. 4 - Prob. 10E
Ch. 4 - Write a method call to add the object held in the...Ch. 4 - Write a method call to remove the third object...Ch. 4 - Suppose that an object is stored at index 6 in a...Ch. 4 - Add a method called checklndex to the...Ch. 4 - Write an alternative version of checkIndex called...Ch. 4 - Rewrite both the 1istFi1e and removeFi1e methods...Ch. 4 - Prob. 17ECh. 4 - Prob. 18ECh. 4 - We know that the first file name is stored at...Ch. 4 - Prob. 20ECh. 4 - Create a MusicOrganizer and store a few file names...Ch. 4 - Create an ArrayList<String> in the Code Pad by...Ch. 4 - If you wish, you could use the debugger to help...Ch. 4 - Challenge exercise The for-each loop does not use...Ch. 4 - Prob. 25ECh. 4 - Prob. 26ECh. 4 - Prob. 27ECh. 4 - Write out the header of a for-each loop to process...Ch. 4 - Suppose we express the first version of the key...Ch. 4 - Write a while loop (for example, in a method...Ch. 4 - Write a while loop to add up the values 1 to 10...Ch. 4 - Write a method called sum with a while loop that...Ch. 4 - Challenge exercise Write a method isPrime (int n)...Ch. 4 - In the findFirst method, the loop's condition...Ch. 4 - Prob. 35ECh. 4 - Have the MusicOrganizer increment the play count...Ch. 4 - Prob. 37ECh. 4 - Prob. 38ECh. 4 - Prob. 39ECh. 4 - Prob. 40ECh. 4 - Complete the numberOfMembers method to return the...Ch. 4 - Prob. 42ECh. 4 - Prob. 43ECh. 4 - Prob. 44ECh. 4 - Challenge exercise Write a method to play every...Ch. 4 - Prob. 46ECh. 4 - Prob. 47ECh. 4 - Add a close method to the Auction class. This...Ch. 4 - Add a getUnsold method to the Auction class with...Ch. 4 - Suppose the Auction class includes a method that...Ch. 4 - Rewrite getLot so that it does not rely on a lot...Ch. 4 - Prob. 52ECh. 4 - Prob. 53ECh. 4 - Prob. 54ECh. 4 - Prob. 55ECh. 4 - Open the products project and complete the...Ch. 4 - Implement the findProduct method. This should look...Ch. 4 - Implement the numberInStock method. This should...Ch. 4 - Prob. 59ECh. 4 - Challenge exercise Implement a method in...Ch. 4 - Java provides another type of loop: the do-while...Ch. 4 - Prob. 85ECh. 4 - Prob. 86ECh. 4 - Find out about Java's switch-case statement. What...
Knowledge Booster
Similar questions
- Guide to working through the project Steps: Write the GradeBook constructor that reads student information from the data file into the ArrayList roster). For now, ignore the grades. Test your GradeBook class before proceeding to the next step. Create the Grade class. Test your Grade class before proceeding to the next step. Modify the Student class to include an ArrayList of Grade. Test the Student class before proceeding to the next step. Finish writing the GradeBook constructor to process the grades as they are read in from the data file. Test the GradeBook class before proceeding to the next step. Add additional functionality to the GradeBook and Student classes one method at a time. Here is Grade.jave code is shown below. public class Grade { // TODO: complete this class as described in this task write-up } GradeBook Class The GradeBook class has a single instance variable roster, an ArrayList of Student. This class performs all operations related to the scores of all…arrow_forwardThis lab was designed to reinforce programming concepts from this lab, you will practice: Declaring and initializing ArrayList. Add elements to the Arraylist. Display the content of the ArrayList. Write a class name PhoneBookEntry that has fields for a person’s name and phone number. The class should have a constructor and the appropriate accessor and mutator methods. Then write a program that creates at least 5 PhoneBookEntry objects and stores them in an ArrayList. Use a loop to display the contents of each object in the ArrayList.arrow_forwardTo demonstrate working with ArrayLists, we will be working with four source files: a Dessert class, two classes that extend Dessert called IceCream and Cake, and a TestDessert class. The TestDessert class contains a main() method that declares an ArrayList to hold Dessert objects. This ArrayList is referenced by the variable named "list". Examine TestDessert's main() method and notice the four comments. You are to implement code that accomplishes the tasks described in each step. For step 1, you are to populate the ArrayList with 10 IceCream and Cake objects. These objects should be inserted into the ArrayList at random. This means each run of the program should produce an ArrayList with different proportions of IceCream and Cake objects. After this operation, the ArrayList should contain 10 total objects (IceCream and Cake objects). Display the ArrayList after the operation. For step 2, if the first and last dessert in the ArrayList are different (one is IceCream and the other is…arrow_forward
- The UnsortedTableMap class is located in the maps folder. In the attachment, you will find a partially implemented class called UnsortedMapOfLists, which extends UnsortedTableMap. The values associated with the keys in UnsortedMapOfLists are arrays. So you have an array with each key. Off course you can save an array in the value of UnsortedTableMap class without the class we are going to develop, but our class makes this easier, as it allows using a syntax like this: myMap["somekey", 1] to reach element at index 1 in the array associated with key "somekey". I already implemented methods __setitem__ and __getitem__. Your task is to: implement method __delitem__ . Deletion will be performed for an element in the array. If index is not given, delete the array associated with the key. implement a function (not a method in the class) to swap the arrays associated with two given keys. Add the required comment in method __getitem__. implement a main to verify that your code is working…arrow_forwardQ8. Write a declaration of a private field named department that can hold an ArrayList. The elements of the ArrayList are of type Student. Write an assignment to the department variable to create an appropriate ArrayList object. Q9. (A) If a collection stores 20 objects, what value would be returned from a call to its size method? (B) Write a method call using get to return the fifth object stored in a collection called department. Q10. Write a method call to add the object held in the variable student1 to a collection department files.arrow_forwardin Jave create two methods work(), and interwork() with the follow instructions: You may assume that the work() method is passed a List that does not contain any null elements. (Note: The List may contain missing elements.) The work() method must not have any side effects. That is, it must not change the parameters that it is passed in any way and it must not change any attributes in any way. The work() method must return the weighted average of the elements in the List it is passed. The label of the result must equal the parameter named rl. The data parameter contains the values to use in the calculation. If an element of data is missing (i.e., has a value attribute that is null) then that element must be ignored in the calculation. The weights attribute contains the weights to use in the calculation. If the weights attribute is null then all weights used in the calculation must be 1. You may assume that all of the elements of weights (if it is non-null) are…arrow_forward
- in Jave create two methods work(), and interwork() with the follow instructions: You may assume that the work() method is passed a List that does not contain any null elements. (Note: The List may contain missing elements.) The work() method must not have any side effects. That is, it must not change the parameters that it is passed in any way and it must not change any attributes in any way. The work() method must return the weighted average of the elements in the List it is passed. The label of the result must equal the parameter named rl. The data parameter contains the values to use in the calculation. If an element of data is missing (i.e., has a value attribute that is null) then that element must be ignored in the calculation. The weights attribute contains the weights to use in the calculation. If the weights attribute is null then all weights used in the calculation must be 1. You may assume that all of the elements of weights (if it is non-null) are…arrow_forwardGiven a base Plant class and a derived Flower class, complete main() to create an ArrayList called myGarden. The ArrayList should be able to store objects that belong to the Plant class or the Flower class. Create a method called printArrayList(), that uses the printInfo() methods defined in the respective classes and prints each element in myGarden. The program should read plants or flowers from input (ending with -1), add each Plant or Flower to the myGarden ArrayList, and output each element in myGarden using the printInfo() method. Ex. If the input is: plant Spirea 10 flower Hydrangea 30 false lilac flower Rose 6 false white plant Mint 4 -1 the output is: Plant 1 Information: Plant name: Spirea Cost: 10 Plant 2 Information: Plant name: Hydrangea Cost: 30 Annual: false Color of flowers: lilac Plant 3 Information: Plant name: Rose Cost: 6 Annual: false Color of flowers: white Plant 4 Information: Plant name: Mint Cost: 4 import java.util.Scanner;import java.util.ArrayList;import…arrow_forwardCreate a new project named lab10. You will be implementing two classes: A SolarSystem class, and a Planet class. The SolarSystem contains Planet objects stored in a vector. A UML diagram for the Solar System and Planet classes The first part you should implement is the Planet class. Don't add the SolarSystem files to the project at the beginning, just work on the Planet class. Test the different overloaded operators as we did during lecture for your Planet class, and then move on to the SolarSystem class. The SolarSystem default constructor should resize the vector to zero. The default constructor values for Planet can be whatever you’d like, but make the mass a very small number, so later on when you're looking for the largest planet, it doesn't use the default Planet value. The addPlanets() method will take a number as an argument for the number of Planets that will be in your SolarSystem. So if you call addPlanets with 5 as an argument, there will be 5 Planets to add to the…arrow_forward
- Say we are about to build an ArrayList. Your ArrayList should guarantee that the array capacity is at most four times the number of elements. What would you like to do to maintain such a limit on the capacity? What is the benefit of using iterators? Can you describe your first experience of GUIs? And could you describe what is the advantage of using GUIs over Command-Line Interface (CLI) operations?arrow_forwardWhat are wrapper classes and why are they useful for ArrayLists? Include examples of autoboxing and unboxing.arrow_forwardPart 2: Sorting the WorkOrders via dates Another error that will still be showing is that there is not Comparable/compareTo() method setup on the WorkOrder class file. That is something you need to fix and code. Implement the use of the Comparable interface and add the compareTo() method to the WorkOrder class. The compareTo() method will take a little work here. We are going to compare via the date of the work order. The dates of the WorkOrder are saved in a MM-DD-YYYY format. There is a dash '-' in between each part of the date. You will need to split both the current object's date and the date sent through the compareTo() parameters. You will have three things to compare against. You first need to check the year. If the years are the same value then you need to go another step to check the months, otherwise you compare them with less than or greater than and return the corresponding value. If you have to check the months it would be the same for years. If the months are the same you…arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
- Database System ConceptsComputer ScienceISBN:9780078022159Author:Abraham Silberschatz Professor, Henry F. Korth, S. SudarshanPublisher:McGraw-Hill EducationStarting Out with Python (4th Edition)Computer ScienceISBN:9780134444321Author:Tony GaddisPublisher:PEARSONDigital Fundamentals (11th Edition)Computer ScienceISBN:9780132737968Author:Thomas L. FloydPublisher:PEARSON
- C How to Program (8th Edition)Computer ScienceISBN:9780133976892Author:Paul J. Deitel, Harvey DeitelPublisher:PEARSONDatabase Systems: Design, Implementation, & Manag...Computer ScienceISBN:9781337627900Author:Carlos Coronel, Steven MorrisPublisher:Cengage LearningProgrammable 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