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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Array

The simplest way to start thinking about an array is as a collection, or a set of elements. In programming, these elements may be constants, variables, functions and pointers.

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Textbook Question

Chapter 4, Problem 56E

Open the products project and complete the StockManager class through this and the next few exercises. StockManager uses an ArrayList to store Product tems. Its addProduct method already adds a product to the collection, but the following methods need completing: delivery, findProduct, printProductDetaiIs, and numberInStock.

Each product sold by the company is represented by an instance of the Product class, which records a product's ID, name, and how many of that product are currently In stock. The Product class defines the increaseQuantity method to record increases in the stock level of that product. The sell One method records that one Item of that product has been sold, by reducing the quantity field level by 1. Product has been provided for you, and you should not need to make any alterations to it.

Start by implementing the printProductDetai1s method to ensure that you are able to iterate over the collection of products. Just print out the details of each Product returned, by calling its toString method.

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Chapter 4, Problem 55E

Chapter 4, Problem 57E

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Chapter 4 Solutions

Objects First with Java: A Practical Introduction Using BlueJ (6th Edition)

Ch. 4 - Prob. 1E Ch. 4 - What happens if you create a new MusicOrganizer...Ch. 4 - Prob. 3E Ch. 4 - Prob. 4E Ch. 4 - Write a declaration of a local variable called...Ch. 4 - Prob. 6E Ch. 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. 17E Ch. 4 - Prob. 18E Ch. 4 - We know that the first file name is stored at...Ch. 4 - Prob. 20E Ch. 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. 25E Ch. 4 - Prob. 26E Ch. 4 - Prob. 27E Ch. 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. 35E Ch. 4 - Have the MusicOrganizer increment the play count...Ch. 4 - Prob. 37E Ch. 4 - Prob. 38E Ch. 4 - Prob. 39E Ch. 4 - Prob. 40E Ch. 4 - Complete the numberOfMembers method to return the...Ch. 4 - Prob. 42E Ch. 4 - Prob. 43E Ch. 4 - Prob. 44E Ch. 4 - Challenge exercise Write a method to play every...Ch. 4 - Prob. 46E Ch. 4 - Prob. 47E Ch. 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. 52E Ch. 4 - Prob. 53E Ch. 4 - Prob. 54E Ch. 4 - Prob. 55E Ch. 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. 59E Ch. 4 - Challenge exercise Implement a method in...Ch. 4 - Java provides another type of loop: the do-while...Ch. 4 - Prob. 85E Ch. 4 - Prob. 86E Ch. 4 - Find out about Java's switch-case statement. What...

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