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When the DownloadManager is instantiated, all of the GUI s controls are initialized inside its constructor The constructor contains a lot of code, but most of it is straightforward The following discussion gives an overview First, the window s title is set with a call to setTitle( ) Next, the setSize( ) call establishes the window s width and height in pixels After that, a window listener is added by calling addWindowListener( ), passing a WindowAdapter object that overrides the windowClosing( ) event handler This handler calls the actionExit( ) method when the application s window is closed Next, a menu bar with a File menu is added to the application s window Then the Add panel, which has the Add Text field and button, is set up An ActionListener is added to the Add Download button so that the actionAdd( ) method is called each time the button is clicked The downloads table is constructed next A ListSelectionListener is added to the table so that each time a row is selected in the table, the tableSelectionChanged( ) method is invoked The table s selection mode is also updated to ListSelectionModelSINGLE_SELECTION so that only one row at a time can be selected in the table Limiting row selection to only one row at a time simplifies the logic for determining which buttons should be enabled in the GUI when a row in the download table is selected Next, a ProgressRenderer class is instantiated and registered with the table to handle the Progress column The table s row height is updated to the ProgressRenderer s height by calling tablesetRowHeight( ) After the table has been assembled and tweaked, it is wrapped in a JScrollPane to make it scrollable and then added to a panel Finally, the buttons panel is created The buttons panel has Pause, Resume, Cancel, and Clear buttons Each of the buttons adds an ActionListener that invokes its respective action method when it is clicked After creating the buttons panel, all of the panels that have been created are added to the window.

Now let s look at a sample entry from an /etc/inittab file:

Let s imagine for just a moment that you want to give SPOT some information to remember. This information consists of some words, a few numbers, and a couple of logical True/False values. SPOT has the ability to place each piece of information in a virtual folder that exists in his memory. That information, however, will disappear when the program ends or the brick is turned off. Here s the pseudo-code: Me: SPOT, will you please store the words pizza and cheesecake in your memory Me: SPOT, I also need you to store the numbers 50 and 200 in your memory. Me: SPOT, will you also please store one logical True and one logical False in your memory Now, before we convert this pseudo-code to an NXT-G program, I need to tell you a little bit about how an NXT-G program stores information, changes it, and retrieves it. All of this can be done using the VARIABLE block or the CONSTANT block. I m going to cover the VARIABLE block first because once you understand how it works, you ll also know how to use the CONSTANT block because it works in an almost identical manner (but with one big exception that I ll reveal later). A VARIABLE block can be used to do one of two things: Information can be written to a virtual folder that is stored in memory. Information can be read from a virtual folder that is stored in memory.

The verifyUrl( ) method is called by the actionAdd( ) method each time a download is added to the Download Manager The verifyUrl( ) method is shown here:

# If power was restored before the shutdown kicked in, cancel it pr:12345:powerokwait:/sbin/shutdown -c "Power Restored; Shutdown Cancelled"

33:

// Verify download URL private URL verifyUrl(String url) { // Only allow HTTP URLs if (!urltoLowerCase()startsWith("http://")) return null; // Verify format of URL URL verifiedUrl = null; try { verifiedUrl = new URL(url); } catch (Exception e) { return null; } // Make sure URL specifies a file if (verifiedUrlgetFile()length() < 2) return null; return verifiedUrl; }