Concept explainers
Challenge exercise Suppose we wished a single TicketMachine object to be able to issue tickets of different prices. For instance, users might press a button on the physical machine to select a discounted ticket price. What further methods and/or fields would need to be added to TicketMachine to allow this kind of functionality? Do you think that many of the existing methods would need to be changed as well?
Save the better-ticket-machine project under a new name, and implement your changes in the new project
Want to see the full answer?
Check out a sample textbook solutionChapter 2 Solutions
Objects First with Java: A Practical Introduction Using BlueJ (6th Edition)
Additional Engineering Textbook Solutions
Starting Out with Java: From Control Structures through Objects (6th Edition)
Starting Out with Java: From Control Structures through Data Structures (4th Edition) (What's New in Computer Science)
Problem Solving with C++ (10th Edition)
Modern Database Management (12th Edition)
Starting Out with Java: Early Objects (6th Edition)
Database Concepts (8th Edition)
- Create a new project for this program called TestOldMaid and add a class with a main() method. In the project: Copy your Deck and Card class from the earlier project into it. Create a subclass of Deck called OldMaidDeck. It is special because one of the Queens is missing so it only has 51 cards. Create a constructor method that calls the super class constructor, then removes a queen. Override the toString method so it returns the name of the deck and the number of cards in it. Write the test main() method. Create an OldMaidDeck object and deal all the cards to six players. It is ok if not everyone has an equal number of cards. Use arrays or ArrayLists for the players hands. Show the hands of all 6 players. Refer to the web to find out more about the Old Maid card game: https://bicyclecards.com/how-to-play/old-maid/ Fully document all classes with your name, date and description. And each data member and method is documented. Each block that does something is also documented.arrow_forwardCreate a new project for this program called TestOldMaid and add a class with a main() method. In the project: Copy your Deck and Card class from the earlier project into it. Create a subclass of Deck called OldMaidDeck. It is special because one of the Queens is missing so it only has 51 cards. Create a constructor method that calls the super class constructor, then removes a queen. Override the toString method so it returns the name of the deck and the number of cards in it. Write the test main() method. Create an OldMaidDeck object and deal all the cards to six players. It is ok if not everyone has an equal number of cards. Use arrays or ArrayLists for the players hands. Show the hands of all 6 players. Refer to the web to find out more about the Old Maid card game. Fully document all classes with your name, date and description. And each data member and method is documented. Each block that does something is also documented. Without removing the Queensarrow_forwardWrite a new snowflake class that extends AbstractShape. Your snowflake should be a unique and simple shape unlike any other student’s. Use the drawing methods provided in the imported Graphics class The SimpleSnowFlake is provided in the project as an additional reference. Add an equals(Object o) method that will compare unique instance variable data and return true if two of your snowflakes are the same. Your equals method should override the method from the Object class and call the equals method of AbstractShape Your snowflake should be a different color and move in a different and unique way.arrow_forward
- Write the code for the timeTick method in ClockDisplay that displays hours, minutes, and seconds, or even implement the whole class if you wish.arrow_forwardthe answer dose not include the main method. Write a main method inside the LibraryManagementSystem class, create a menu system that allows the Librarian input commands to interact with the system. Below is the menu system that students should aim to recreate. Give an appropriate message after each action to notify the Librarian if an action was successful. Make use of the toString() to print the Book objects.arrow_forwardPLEASE ENSURE TO USE THE FRAMEWORK PROVIDED IN THE IMAGES, AND THAT IT WORKS WITH THE TESTER CLASS. PLEASE EDIT BOTH THE TEST CLASS, DO NOT EDIT THE MAIN METHOD. Write a BankAccountTester class whose main method constructs a bank account, deposits $1,000, withdraws $500, withdraws another $400, and then prints the remaining balance. Also print the expected result.arrow_forward
- How many different ways can you think of to indicate that a method has received incorrect parameter values or is otherwise unable to complete its task? Consider as many different sorts of applications as you can—for instance: those with a GUI; those with a textual interface and a human user; those with no sort of interactive user, such as software in a vehicle’s enginemanagement system; or software in embedded systems such as a cash machine.arrow_forwardLook at the API of the Point class and find out how to construct a Point object. Write a Java program “PointTester”, that constructs two points with coordinates (3, 4) and (–3, –4). Find the distance between them, using the distance method. Print the distance, as well as the expected value. (You may draw a sketch on graph paper to find the value you will expect.) - Update your program so it randomly select coordinate points (x,y), where −50 ≤ ? ≤ 50 ??? ? ∈ [−90, 90].arrow_forwardImplement the "paint fill"feature seen in several picture editing products.To put it another way, if you have a screen (represented by a two-dimensional array of colours), a point, and a new colour, Fill in the surrounding area until the colour shifts away from the original.arrow_forward
- Create another ticket machine for tickets of a different price; remember that you have to supply this value when you create the machine object. Buy a ticket from that machine. Does the printed ticket look any different from those printed by the first machine?arrow_forwardIn this task, you will create your own interface, which is not provided in the Java library. Let’s start with a simple example. Say we have a collection of animal classes, with each class represents a kind of animal. They all share a common ability of “speak”. Dog speak in the way of “Woof! Woof!”, cats speak in the way of “Meow! Meow!”, etc. In order to capture this common characteristic, we need an interface named Speakable: public interface Speakable { // put the method header here } Think about what method is needed for the Speakable interface? (what method can describe the speakable feature? ) We simply need one method speak() to print out the way that the animal “speaks”. Put the method header in the interface body. This method does not take any parameter and does not return any value. Be reminded that you only need to put the method header with a semicolon (abstract method) into the interface. BE NOTED: Adding an interface is different from adding a class. You need to click File…arrow_forwardPlease help me create a cave class for a Hunt the Wumpus game (in java). You can read the rules in it's entirety of the Hunt the Wumpus game online to get a better idea of the specifications. It's an actual game. INFORMATION: The object of this game is to find and kill the Wumpus within a minimum number of moves, before you get exhausted or run out of arrows. There is only one way to win: you must discover which room the Wumpus is hiding in and kill it by shooting an arrow into that room from an adjacent room. The Cave The Wumpus lives in a cave of 30 rooms. The rooms are hexagonal. Each room has up to 3 tunnels, allowing access to 1, 2 or 3 (out of 6) adjacent rooms. The attached diagram shows the layout of rooms in the cave. The map wraps around such that rooms on the edges (white cells) have neighbors from the opposite edge (blue cells). E.g., the neighbors of room 1 are rooms 25, 26, 2, 7, 6, and 30, and you could choose to connect room 1 to any of these rooms. Observe how…arrow_forward
- 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