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
Concept explainers
Textbook Question
Chapter 3, Problem 56E
Describe the changes that would be required to the ClockDisplay class in order to be able to display hours, minutes, and seconds. How many NumberDisplay objects would a ClockDisplay object need to use?
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solutionStudents have asked these similar questions
When I write the code here to visual studio, I get errors and I don't know how to fix it. Please examine it in detail and I would appreciate it because I have no right to ask any more questions.
class Main {
public class GameManagement { // This class holds all the team & score management
private List<Team> teams = new ArrayList<Team>();
private int countTeam;
private static int MAX_TEAMS=8;
public GameManagement (){
try {
FileReader fr = new FileReader("player.txt"); // reading from the text file
Scanner in = new Scanner(fr);
while (in.hasNextLine()){
String line = in.nextLine();
Team team = new Team(line);
teams.add(team);
}
} catch (...) {}
}
public List<Team> getTeams(){
return teams;
}
}
public class GameTournamentGUI extends JFrame {
GameManagement manager…
Python:
Write a code snippet that imports the tkinter library and creates a new window object root.
Add a label widget to the window object root with the text "Hello, World!".
Write a code snippet that adds a button widget to the window object root with the text "Click me!", and binds the button to a function button_click() that prints "Button clicked!" to the console.
Hint: You may find the Label, Button, and command attributes in tkinter useful for completing parts 2 and 3
Note: For each part of the question, make sure to provide clear instructions and examples for the code snippets. Also, make sure to test your code snippets to ensure that they work as intended.
AVA code
OVERVI EW
This is a review exercise, so the primary goal of the exercise is to get your mind working and in the correct space.In this activity you will create a imaginary grid of locations that goes from −?≤?≤?, −?≤?≤?, with the coordinate (0,0) being "home". On this grid you will keep track of various animal objects as they move around the grid. Make sure that all animals stay within that grid at all timesincluding when they are created. Zwill be the map size and will control the highest number allowed on themap before wraping around. Using Java, create the following classes and primary program that uses the classes that you developed.
INS T RUCT IONS
Create the following classes.
A N I MA L C LA SS
Create an Animal class. Each animal has a name, an x and y integer coordinate. The Animal class should have at minimum the following methodsbelowbut you may want to add more if necessary:
Also note, everyanimal will need to have to have “z”passed to it so that it knows how big the…
Chapter 3 Solutions
Objects First with Java: A Practical Introduction Using BlueJ (6th Edition)
Ch. 3 - Prob. 1ECh. 3 - At what time (s) can a class diagram change? How...Ch. 3 - At what time(s) can an object diagram change? How...Ch. 3 - Write a definition of a field named tutor that can...Ch. 3 - Prob. 5ECh. 3 - Create a second NumberDisplay object with a limit...Ch. 3 - Select Show Code Pad from the View menu. Create a...Ch. 3 - What error message do you see in the Code Pad if...Ch. 3 - What error message do you see in the Code Pad if...Ch. 3 - What happens when the setValue method is called...
Ch. 3 - Prob. 11ECh. 3 - Prob. 12ECh. 3 - Which of the following expressions return...Ch. 3 - Write an expression using boolean variables a and...Ch. 3 - Write an expression using boolean variables a and...Ch. 3 - Consider the expression (a && b). Write an...Ch. 3 - Does the getDisplayValue method work correctly in...Ch. 3 - Prob. 18ECh. 3 - In Exercise 2.79 you were asked to investigate...Ch. 3 - Explain the modulo operator. You may need to...Ch. 3 - What is the result of the expression 83?Ch. 3 - Try out the expression in the Code Pad. Try other...Ch. 3 - Prob. 23ECh. 3 - Prob. 24ECh. 3 - Explain in detail how the increment method works.
Ch. 3 - Rewrite the increment method without the modulo...Ch. 3 - Open the clock-display project and create a...Ch. 3 - Prob. 28ECh. 3 - Prob. 29ECh. 3 - Prob. 30ECh. 3 - Look at the second constructor in C1ockDisplay's...Ch. 3 - Prob. 32ECh. 3 - Given a variable Printer p1; which currently holds...Ch. 3 - Open the house project from Chapter 1 and review...Ch. 3 - Prob. 35ECh. 3 - Does the Picture class contain any internal method...Ch. 3 - Remove the following two statements from the draw...Ch. 3 - Prob. 38ECh. 3 - Prob. 39ECh. 3 - Assume a class Tree has a field of type Triangle...Ch. 3 - Prob. 41ECh. 3 - Open the mail-system project, which you can find...Ch. 3 - Prob. 43ECh. 3 - Prob. 44ECh. 3 - Open the editor for the MailClient class and set a...Ch. 3 - Step one line forward in the execution of the...Ch. 3 - Prob. 47ECh. 3 - Prob. 48ECh. 3 - Prob. 49ECh. 3 - Set a breakpoint in the first line of the sendMai1...Ch. 3 - Use a combination of code reading, execution of...Ch. 3 - Use the debugger to investigate the clock-display...Ch. 3 - Prob. 53ECh. 3 - Prob. 54ECh. 3 - Prob. 55ECh. 3 - Describe the changes that would be required to the...Ch. 3 - Write the code for the timeTick method in...Ch. 3 - Discuss whether the current design of the...Ch. 3 - Challenge exercise In the current design of...
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
- The first application you will complete simulates a fight with the mythical greek hydra. As legend goes, if you were to chop off the head of a hydra, two smaller heads would grow back in its place. In order for our fight to have an end, we will assume that once the size of the targeted head is small enough, no new heads will grow back in its place. The goal of this application is to determine the amount of work required to kill a hydra with a single head, when the size of the head is given as input. Final output would look like this The head bag is Bag[ 3 ]The head bag is Bag[ 2 2 ]The head bag is Bag[ 2 1 1 ]The head bag is Bag[ 2 1 ]The head bag is Bag[ 2 ]The head bag is Bag[ 1 1 ]The head bag is Bag[ 1 ]The head bag is Bag[ ]The number of chops required is 7Run the program again using 4 for the size of the initial head. The work done should be 15.Run the program again using 5 for the size of the initial head. You should get the computation ended early.Run the program again using 6…arrow_forwardYou are going to write a simulation for a mini survival game. In this game, one flyand three frogs are placed randomly on a board with the size 7x7.In each iteration, they move randomlywithin the board, and the simulation stops when one of the frogs eats the fly.Fly and frogs are essentially creatures that can move, make noise, and eat. Frogs can move up to 2squares in any direction and flies can move up to 1. Frogs make the "Croak! Croak!" sound, and fliesmake "ZzzZZz!". Since frogs should not eat their kind, a function of "isEatable" should also beimplemented in decision making. A variable or function to check if the fly is alive is also required as aterminate condition for simulation.In each iteration, an 'f' character represents frogs' position on board, and an '*' character is used torepresent the position of fly. Use the topics (Abstract classes, Interface, etc.) to implementthe simulation. (in java) An example output is given below.arrow_forwardDevelop an interactive GUI-Tkinter Calculator. The calculator will include all standard mathematical operations such as addition, subtraction,multiplication and division. The expect output is shown in the picture.arrow_forward
- I want to develop an application for Knight's Tour Chess Game in java where the board is an eight by eight - 2D array board. Each square should be 0 in the beginning and as the knight moves in L shaped moves. The application is developed to move the knight around the chessboard and then keep a counter that varies from 1 to 64. Record the latest count in each square the knight moves to. Test each potential move to see if the knight has already visited that square. Test every potential move to ensure that the knight does not land off the chessboard. I want to run the application with random initial position.arrow_forwardOpen the clock-display project and create a ClockDisplay object by selecting the following constructor: new ClockDisplay() Call its getTime method to find out the initial time the clock has been set to. Can you work out why it starts at that particular time?arrow_forwardKingdom of Trolls is celebrating their Kingdom Day and one of the activities that is taking place is a game where a player rolls a magic ball down the hill on a path with spikes. As the ball rolls down, it strikes a spike and bursts open to release a number of smaller balls (in our simulated game, the number of smaller balls is a randomly generated integer between 2 and 6, inclusive). As the smaller balls further roll down, when one strikes a spike, that ball and all its sibling balls burst and each generates another set of smaller balls (using the same random number already generated for the first roll). The balls keep rolling downhill and striking spikes and bursting into smaller balls until a golden ball is released by one of the bursts. At this time, the game is over and the player is told how many balls were generated during the last burst (including the golden ball). The game is played by two players at a time and the player who had the lowest number of balls generated on the…arrow_forward
- Problem: Bugs are simple creatures that only know how to walk towards other bugs. Bugs maintain information about their (x, y) position; by which it can tell if they are standing next to other bugs. Watch the following video: bug movement. Create a java project that simulate bugs movement. You need to write a class “Bug" that models a bug moving along a straight line and it can turn to change its direction counterclockwise (i.e. 90 degree to the left; north → west → south → east → north). In each move, its position changes by one unit in the current direction. Details of the "Bug" class is described below. Your simulator should read information of an unknown number of “Bug" objects from an input file called “Bugs.txt". Each line represents a bug and the initial position and facing direction of this particular bug. Keeping the first bug position as a reference the simulator should move the second bug next to the first bug forming a cluster and its final position and direction should be…arrow_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_forward: Design and implement a text-based Minesweeper game. Minesweeper is the classicsingle-player computer game where an NxN grid has B mines (or bombs) hidden across the grid. Theremaining cells are either blank or have a number behind them. The numbers reflect the number ofbombs in the surrounding eight cells. The user then uncovers a cell. If it is a bomb, the player loses.If it is a number, the number is exposed. If it is a blank cell, this cell and all adjacent blank cells (up toand including the surrounding numeric cells) are exposed. The player wins when all non-bomb cellsare exposed. The player can also flag certain places as potential bombs. This doesn't affect gameplay, other than to block the user from accidentally clicking a cell that is thought to have a bomb.(Tip for the reader: if you're not familiar with this game, please play a few rounds on line first.)arrow_forward
- Can you make a GUI in java that : 1. (game field) randomizes 9 numbers (form 0 to 9) numbers. randomizes n (rows) and collumns(m) ((from 1 to 4)) The result should be a GUI with a n x m matrix of buttons, each button should be a random number form 1 to 9. The idea is after every compile i should get a random arrangement 2. random target value is displayed above game field(100-300) 3. The current sum of the numbers displayed on the buttons of the game field is printedbelow the game field 4.The number of moves to completion is displayed in the upper right corner above thegame field. 5.current mathematical operation - add a component to the right side of the gamefield that displays the current mathematical operation. The current mathematicaloperation starts at +, after the first move it should randomize. The current mathematical operation only applies for one move, and after the move a new mathematicaloperation is randomly selected that will be evaluated in the next move. Choose fromthe…arrow_forwardQ2: Wire a code for an Arduino Car Speed Detector shown in the schematic diagram below (IR sensor=KY-032) IR sensor 1 IR sensor 2 How it works: This project works on a simple physics law of calculating the speed as distance/time. Speed = Distance/Time When a car passes the ist IR sensor, it detects and save the first-time value. Then we measure the second time value when the car reaches the IR sensor 2. The difference of both the time is the travel distance from one sensor to the other. We get the time in which car travels a distance of 10 meters so we can calculate the speed of the car. 10 metersarrow_forward2. Write an interface for Tossable. We will say that every Tossable item has a way to toss it and we want to be able to give its color. A Tossable item by default is to throw an assist toss to another player.arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
- EBK JAVA PROGRAMMINGComputer ScienceISBN:9781305480537Author:FARRELLPublisher:CENGAGE LEARNING - CONSIGNMENT
EBK JAVA PROGRAMMING
Computer Science
ISBN:9781305480537
Author:FARRELL
Publisher:CENGAGE LEARNING - CONSIGNMENT
Time Complexity Analysis - How To Calculate Running Time | InterviewBit; Author: InterviewBit;https://www.youtube.com/watch?v=--oxG4Q1PA0;License: Standard YouTube License, CC-BY