Chapter 4, Problem 3E

Given:

MusicOrganizer class.

listFile() method.

removeFile() method.

To find: The result when listFile(0) method is called after removeFile(0) method.

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 and select a new MusicOrganizer() of the class MusicOrganizer to make its instance.

The window would 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 call listFile(0) and listFile(1) to show the two files, right-click on the instance musicOrg1 of the class MusicOrganizer, and then click on the method 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...