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.

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.

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.

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.

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.

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.

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

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

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.

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.

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 3, Problem 59E

Chapter 4, Problem 2E

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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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