Objects First with Java: A Practical Introduction Using BlueJ (6th Edition)
6th Edition
ISBN: 9780134477367
Author: David J. Barnes, Michael Kolling
Publisher: PEARSON
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Chapter 11, Problem 7E
Program Plan Intro
Program Description:
To modify the given Post class and the display method of MessagePost to produce the desired result.
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This is for pygame
Text Class
The Text class inherits from Drawable and it will be used to display the player's score. You must implement at
the very least the required methods of the base class (draw and get_rect), as well as a constructor. You may
need to implement other methods as part of the public interface.
This is the Drawable Class
import pygame
import abc
import random
class Drawable(metaclass - abc. ABCMeta):
def --init(self, x- 0, y -0):
self.x - x
self.y - y
self.position - (self.x, self.y)
self.visible - False
def setloc(self, p):
self.x - p[0]
self.y - p[1]
def getloc(self):
return(self.x, self.y)
def getX(self):
return self.x
def getY(self):
return self.y
eabc.abstractmethod
def draw(self, surface):
pass
eabc.abstractmethod
def get_rect(self):
pass
Your assignment for this course is to implement a beginner level Book Management System (BMS) in Java language. BMS contains 2 classes: Bookand BookList. The Book class has the following attributes:
code: a String object, that hold the book’s code.
title: a String object, that hold the book’s title.
qua: int variable, that hold the number of books with the same code in the library.
price: a double variable, that hold the book’s price.
The BookList class contains only one data member: ArrayList<Book> t. When running the program display the menu as below:1. Input & add book(s) to the end.2. Display all books.3. Search a book for given code.4. Update the book’s price for given code.5. Find the (first) max price value.6. Sort the list ascendingly by code.7. Remove the book having given code.8. Load data from file.0. Exit.Notes:(1) The book’s code must be unique in the list.(2) Display all books in format (code, title, quantity, price).(5)…
This way, any class that implements the Visible interface can define its own behavior for making an object visible or invisible based on its specific requirements.Create the Priority Java interface, which has the methods setPriority and getPriority. A method for determining numerical priority among a group of objects should be defined by the interface. Create and implement a class named Task that represents a task that implements the Priority interface, such as one that is on a to-do list. To test some Task objects, construct a driver class.
Chapter 11 Solutions
Objects First with Java: A Practical Introduction Using BlueJ (6th Edition)
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