Objects First with Java: A Practical Introduction Using BlueJ (6th Edition)
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 4, Problem 1E

Explanation of Solution

Given: The project name music-organizer-v1 and the class name MusicOrganizer.

To find: The way to store the names of some audio files and the number of files returned by the numberOfFiles.

Solution:

Open BlueJ and then open a new project named Music-organizer-v1.

Objects First with Java: A Practical Introduction Using BlueJ (6th Edition), Chapter 4, Problem 1E , additional homework tip  1

To make the instance of the class MusicOrganizer:

Right-click on the class MusicOrganizer.

Select construct new MusicOrganizer() of the class MusicOrganizer to make its instance.

Objects First with Java: A Practical Introduction Using BlueJ (6th Edition), Chapter 4, Problem 1E , additional homework tip  2

A window would show up which will ask for the name of the instance.

So, enter the name of the instance as objMusicOrg1 in place of default instance name and click on OK button.

Objects First with Java: A Practical Introduction Using BlueJ (6th Edition), Chapter 4, Problem 1E , additional homework tip  3

After that, right-click on that instance residing on the object bench and then click on the method addFile to add some file names to the instance.

Objects First with Java: A Practical Introduction Using BlueJ (6th Edition), Chapter 4, Problem 1E , additional homework tip  4

A window would show up asking for the name of the file to add it to the collection.

Enter any file name (along with its location) within the text box linked with it and then click on the OK button.

Objects First with Java: A Practical Introduction Using BlueJ (6th Edition), Chapter 4, Problem 1E , additional homework tip  5

Repeat this procedure two times to add two file names to the collection.

To examine the number of files stored, right-click on the instance objMusicOrg1 of the class MusicOrganizer and then click on the method getNumberOfFiles.

Objects First with Java: A Practical Introduction Using BlueJ (6th Edition), Chapter 4, Problem 1E , additional homework tip  6

As we have added two files to the collection, the method result of getNumberOfFiles returned 2.

Objects First with Java: A Practical Introduction Using BlueJ (6th Edition), Chapter 4, Problem 1E , additional homework tip  7

To print the files stored in the collection of the class instance objMusicOrg1, we require to method call listFile.

Objects First with Java: A Practical Introduction Using BlueJ (6th Edition), Chapter 4, Problem 1E , additional homework tip  8

When the method listFile is called, a window would show up which will ask for the file index. Since we have stored 2 files in the collection and the indexing in any collection starts form 0, starting from 0 the index will end at 1, that is, from 0 to 1.

Objects First with Java: A Practical Introduction Using BlueJ (6th Edition), Chapter 4, Problem 1E , additional homework tip  9

Here, 0 shows the first file index and 1 shows the second file index.

Output:

After clicking on the OK button in the window shown above, we get the following result.

Objects First with Java: A Practical Introduction Using BlueJ (6th Edition), Chapter 4, Problem 1E , additional homework tip  10

Modifying the index at the time of calling the method listFile, we get the filenames stored in that index on the Terminal Window.

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Chapter 4 Solutions

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

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...
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