SRS.rar_学生注册功能

CHAPTER 16 SRS NOTES ==================== TWO CLASSES HAVE BEEN *ADDED* AS OF CHAPTER 16: MainFrame PasswordPopup AND TWO HAVE *CHANGED* SINCE CHAPTER 15: Student SRS TOTAL OF FOURTEEN CLASSES *UNCHANGED* SINCE CHAPTER 15: Course CourseCatalog EnrollmentStatus Faculty InvalidStudentException Person Professor ScheduleOfClasses Section SRSDataAccess SRSInitializationException StudentPersistenceException Transcript TranscriptEntry FOR A GRAND TOTAL OF EIGHTEEN CLASSES. === OTHER FILES IN THIS DIRECTORY ARE AS FOLLOWS: *.dat - miscellaneous data files read by the SRS application *.dat.orig - original versions of selected data files, to be used in "resetting" file contents if the programs are to be rerun multiple times reset.bat - a DOS script for reinstating the contents of various *.dat files to their original state if the programs are to be rerun multiple times FileNames.properties - a Java properties file that maps symbolic file names to physical file names so that the latter needn't be hardcoded into the SRS application === THE REMAINING FOUR FILES, IF PRESENT, ARE TO BE *DELETED*: code.bat copyCode.bat diffCode.bat separator.txt =============== // MainFrame.java - Chapter 16, Java 5 version. // Copyright 2005 by Jacquie Barker - all rights reserved. // A GUI class. import java.awt.*; import java.awt.event.*; import javax.swing.*; import javax.swing.event.*; import java.util.*; public class MainFrame extends JFrame { // Define all of the components here as attributes of this class. private JPanel leftPanel; private JPanel topLeftPanel; private JPanel labelPanel; private JPanel fieldPanel; private JPanel bottomLeftPanel; private JPanel rightPanel; private JPanel buttonPanel; private JTextField ssnField; //? private JTextField nameField; private JLabel nameLabel; private JLabel totalCoursesLabel; private JButton dropButton; private JButton addButton; private JButton logoffButton; private JButton saveScheduleButton; private JLabel l1; private JLabel l2; private JLabel l3; private JLabel l4; private JList studentCourseList; private JList scheduleOfClassesList; // Maintain a handle on the Student who is logged in. // (Whenever this is set to null, nobody is officially logged on.) private Student currentUser; // Constructor. public MainFrame() { // Initialize attributes. currentUser = null; // Note that using "this." as a prefix is unnecessary - // any method calls that stand alone (without a dot notation // prefix) are UNDERSTOOD to be invoked on THIS object. this.setTitle("Student Registration System"); this.setSize(500, 300); Container contentPane = this.getContentPane( ); // Technique for centering a frame on the screen. Dimension frameSize = this.getSize(); Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize(); this.setLocation((screenSize.width - frameSize.width)/2, (screenSize.height - frameSize.height)/2); // Create a few panels. leftPanel = new JPanel(); leftPanel.setLayout(new GridLayout(2, 1)); topLeftPanel = new JPanel(); topLeftPanel.setLayout(new GridLayout(1, 2)); labelPanel = new JPanel(); labelPanel.setLayout(new GridLayout(4, 1)); fieldPanel = new JPanel(); fieldPanel.setLayout(new GridLayout(4, 1)); bottomLeftPanel = new JPanel(); bottomLeftPanel.setLayout(new BorderLayout()); rightPanel = new JPanel(); rightPanel.setLayout(new BorderLayout()); buttonPanel = new JPanel(); buttonPanel.setLayout(new GridLayout(1, 4)); // We'll allow the main frame's layout to remain the // default BorderLayout. // Note that we are adding labels without maintaining // handles on them! This is because we don't need to // manipulate them programmatically after the fact. // Thus, we use the same reference variable "l" repeatedly. JLabel l = new JLabel("SSN: "); l.setForeground(Color.black); labelPanel.add(l); l = new JLabel("Name: "); l.setForeground(Color.black); labelPanel.add(l); l = new JLabel("Total Courses: "); l.setForeground(Color.black); labelPanel.add(l); // Add an empty label for padding/white space. l = new JLabel(""); labelPanel.add(l); // We DO maintain handles on modifiable components, however, so // that we can later go back and read/write their contents // by name. Note our choice of descriptive names for these. ssnField = new JTextField(10); //? nameField = new JTextField(10); nameLabel = new JLabel(); nameLabel.setForeground(Color.black); totalCoursesLabel = new JLabel(); totalCoursesLabel.setForeground(Color.black); fieldPanel.add(ssnField); //? fieldPanel.add(nameField); fieldPanel.add(nameLabel); fieldPanel.add(totalCoursesLabel); // Add an empty label for padding/white space. l = new JLabel(""); fieldPanel.add(l); // Create the buttons and add them to their panel. Again, // note use of descriptive names. dropButton = new JButton("Drop"); addButton = new JButton("Add"); logoffButton = new JButton("Log Off"); // Technique for creating a multi-line button label. saveScheduleButton = new JButton(); saveScheduleButton.setLayout(new GridLayout(2, 1)); l1 = new JLabel("Save My", JLabel.CENTER); l1.setForeground(Color.black); l2 = new JLabel("Schedule", JLabel.CENTER); l2.setForeground(Color.black); saveScheduleButton.add(l1); saveScheduleButton.add(l2); buttonPanel.add(dropButton); buttonPanel.add(saveScheduleButton); buttonPanel.add(new JLabel("")); // white space padding buttonPanel.add(addButton); buttonPanel.add(logoffButton); studentCourseList = new JList(); studentCourseList.setFixedCellWidth(200); bottomLeftPanel.add(studentCourseList, BorderLayout.CENTER); l = new JLabel("Registered For:"); l.setForeground(Color.black); bottomLeftPanel.add(l, BorderLayout.NORTH); l = new JLabel("--- Schedule of Classes ---", JLabel.CENTER); l.setForeground(Color.black); rightPanel.add(l, BorderLayout.NORTH); // Retrieve a Collection of Sections from the main ScheduleOfClasses, // then sort it via a private "housekeeping" method, // sortSections, before displaying it. scheduleOfClassesList = new JList(sortSections(SRS.scheduleOfClasses. getSectionsOffered())); scheduleOfClassesList.setFixedCellWidth(250); rightPanel.add(scheduleOfClassesList, BorderLayout.EAST); // Initialize the buttons to their proper enabled/disabled // state. resetButtons(); // Finally, attach all of the panels to one another // and to the frame. // Add in ascending row, then column, order. topLeftPanel.add(labelPanel); topLeftPanel.add(fieldPanel); leftPanel.add(topLeftPanel); leftPanel.add(bottomLeftPanel); contentPane.add(leftPanel, BorderLayout.WEST); contentPane.add(rightPanel, BorderLayout.CENTER); contentPane.add(buttonPanel, BorderLayout.SOUTH); // ------------------ // Add all behaviors. // ------------------ // Different types of components require different types // of listeners: // // o Text fields respond to an ActionListener // whenever the Enter key is pressed. // // o Buttons respond to an ActionListener // whenever the button is clicked. // // o JLists respond to a ListSelectionListener // whenever an item is selected. ActionListener aListener; ListSelectionListener lListener; WindowAdapter wListener; // ssnField aListener = new ActionListener() { public void actionPerformed(ActionEvent e) { // First, clear the fields reflecting the // previous student's information. clearFields();