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passwordLabel = new JLabel("Password: ", JLabel.RIGHT); passwordLabel.setForeground(Color.black); We create an ActionListener to listen to the passwordField component: passwordField = new JPasswordField(); ActionListener aListener = new ActionListener() { public void actionPerformed(ActionEvent e) { Recall our discussion of the use of a char[] array to retrieve passwords when we discussed JPasswordField in 16. When we retrieve the password, we use the trim method of the String class to strip off any leading or trailing white space that may have been erroneously typed by the user. // Retrieve the password. char[] pw = passwordField.getPassword(); password = new String(pw).trim(); Next, we hide the window, but do not dispose of it; it will wait, invisibly, until client code asks it to divulge the password. Then, as we saw when we reviewed the code of the MainFrame class earlier in this chapter, it is the client code s responsibility to call the dispose method on this pop-up. // Hide, but don't dispose of, this window ... // we need to give the client code a chance to // retrieve the user's typed response via // the getPassword method first. PasswordPopup.this.setVisible(false); } }; passwordField.addActionListener(aListener); contentPane.add(passwordLabel); contentPane.add(passwordField); this.setSize(200, 60); // Center it on the screen. Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize(); Dimension popupSize = this.getSize(); int width = popupSize.width; int height = popupSize.height; this.setLocation((screenSize.width - width)/2, (screenSize.height - height)/2); this.setVisible(true); } Here s the method to be used to retrieve whatever the user typed: public String getPassword() { return password; }

We consider Django as a very successful platform that perfectly fits in the Pythonic way of thinking. Almost everything just worked as intended. One thing that needed a bit of work in our current project was tweaking the global settings.py file and directory structure/configuration (for apps, templates, locale data, etc.), because we implemented a highly modular and configurable system, where all Django views are actually methods of some class instances. But with the omnipotence of dynamic Python code, that was still possible.

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Figure 9-2. Basic syntax for analytical functions The use of the term OVER indicates an analytical function, something you need to keep in mind as there are analytical functions with the same names as regular functions. For example, the analytical functions SUM and AVG have the same names as their non-analytical counterparts. A key clause is ORDER BY. This indicates the order in which the functions are applied. In the preceding example, RANK is applied according to the employee salary. Remember that the default for ORDER BY is ascending, smallest to largest, so you have to specify the keyword DESC, for descending, to sort from largest to smallest. The ORDER BY clause must come last in the analytical function.

Finally, we provide our PasswordPopup class with a test scaffold main method: // Test scaffold. public static void main(String[] args) { PasswordPopup pp = new PasswordPopup(new JFrame()); System.out.println("Password typed: " + pp.getPassword()); pp.dispose(); System.exit(0); } With the addition of a main method to class PasswordPopup, we can now run it from the command line as java PasswordPopup rather than having to run the main driver program to see it as follows: java SRS This is useful if we want to see how our pop-up looks early on in its development. Note that, as discussed earlier in the chapter, there is no harm in leaving this main method in the PasswordPopup class even after our testing is finished it is a handy thing to keep around in case we change the look of this dialog box later, and want to retest it.

Now that we have a GUI to use in interacting with the SRS, many of the extra steps that we went through in the 15 version of the SRS driver class are now unnecessary. Specifically, here are the things we were able to eliminate from our main method: We no longer need to hardcode the creation of Student objects to simulate logons, since we now have a GUI for this purpose. Neither do we need to simulate a Student enrolling in a Section, since we can drive that behavior via the GUI now, too. And, since we can now verify the outcome of our interactions with the SRS in terms of object states simply by viewing the GUI, we no longer need to use our various display methods to inspect the internal state of our objects. (We ll retain the display methods in their respective classes, however, to help us with debugging the application at a later date as needed.) The only new logic that we had to add to the SRS class was the single line of code needed to create and display an instance of the main GUI window: // Create and display an instance of the main GUI window. new MainFrame(); (Recall that this can be an unnamed object because the event-dispatching thread will maintain a handle on it to keep it from being prematurely garbage collected.) The resultant streamlined SRS class code is shown here:

Do take care to remember that the statement ORDER BY and the function ORDER BY are independent of each other. If you place another clause after the ORDER BY in a function call, you get the following rather cryptic error message:

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