Bài giảng Lập trình Java cơ sở dữ liệu - Bài 3: Components (Phần 2) - Nguyễn Hữu Thể

Nội dung text: Bài giảng Lập trình Java cơ sở dữ liệu - Bài 3: Components (Phần 2) - Nguyễn Hữu Thể

1. LẬP TRÌNH JAVA CSDL BÀI 3 COMPONENTS Nguyễn Hữu Thể 1
2. Nội dung JList JTable JMenu JOptionPane JFileChooser 2
3. JList Creating a Model There are three ways to create a list model: •DefaultListModel — everything is pretty much taken care of for you. The examples in this page use DefaultListModel. •AbstractListModel — you manage the data and invoke the "fire" methods. For this approach, you must subclass AbstractListModel and implement the getSize and getElementAt methods inherited from the ListModel interface. •ListModel — you manage everything.
4. JList Initializing a List list = new JList(data); //data has type Object[] list.setSelectionMode(ListSelectionModel.SINGLE_INTERVAL_SE LECTION); list.setLayoutOrientation(JList.HORIZONTAL_WRAP); list.setVisibleRowCount(-1); JScrollPane listScroller = new JScrollPane(list); listScroller.setPreferredSize(new Dimension(250, 80));
5. JList DefaultListModel . Methods: • addElement (Object e) • get (int index) • getSize () • getElementAt (int index) • remove (int index) • Elements() • removeAllElements () 5
6. JList Methods: – setModel (ListModel model), getModel () – getMaxSelectionIndex (), getMinSelectionIndex () – getSelectedIndex (), getSelectedIndices () – getSelectedValue (), getSelectedValues () Events: – valueChanged 6
7. JTable 7
8. JOptionPane 8
9. JTable DefaultTableModel – addColumn (Object obj) – addRow (Object obj) – getColumnCount () – getRowCount () – getValueAt (int row, int col) – setValueAt (Object obj, int row, int col) 9
10. JTable Methods: – setModel (TableModel tm) – getModel () – getValueAt (int row, int col) – getRowCount () – getColumnCount () Events: – mouseClicked 10
11. JTable package project; import javax.swing.JFrame; import javax.swing.JScrollPane; import javax.swing.JTable; public class JTableComponent { public static void main(String[] argv) throws Exception { Object[][] cellData = {{ "1-1", "1-2" }, { "2-1", "2-2" }}; String[] columnNames = { "col1", "col2" }; JTable table = new JTable(cellData, columnNames); JFrame f = new JFrame(); f.setSize(300,300); f.add(new JScrollPane(table)); f.setVisible(true); } 11 }
12. JTable DefaultTableModel() Constructs a default DefaultTableModel which is a table of zero columns and zero rows. DefaultTableModel(int rowCount, int columnCount) Constructs a DefaultTableModel with rowCount and columnCount of null object values. DefaultTableModel(Object[][] data, Object[] columnNames) Constructs a DefaultTableModel and initializes the table by passing data and columnNames to the setDataVector method. DefaultTableModel(Object[] columnNames, int rowCount) Constructs a DefaultTableModel with as many columns as there are elements in columnNames and rowCount of null object values. DefaultTableModel(Vector columnNames, int rowCount) Constructs a DefaultTableModel with as many columns as there are elements in columnNames and rowCount of null object values. DefaultTableModel(Vector data, Vector columnNames) Constructs a DefaultTableModel and initializes the table by passing data and columnNames to the setDataVector method. 12
13. JTable void addColumn(Object columnName) Adds a column to the model. void addColumn(Object columnName, Object[] columnData) Adds a column to the model. void addColumn(Object columnName, Vector columnData) Adds a column to the model. void addRow(Object[] rowData) Adds a row to the end of the model. void addRow(Vector rowData) Adds a row to the end of the model. protected static convertToVector(Object[] anArray) Vector Returns a vector that contains the same objects as the array. 13
14. JTable void addColumn(Object columnName) Adds a column to the model. void addColumn(Object columnName, Object[] columnData) Adds a column to the model. void addColumn(Object columnName, Vector columnData) Adds a column to the model. void addRow(Object[] rowData) Adds a row to the end of the model. void addRow(Vector rowData) Adds a row to the end of the model. protected static convertToVector(Object[] anArray) Vector Returns a vector that contains the same objects as the array. 14
15. JOptionPane 15
16. JOptionPane 16
17. JOptionPane 17
18. JFileChooser 18
19. JFileChooser 19
20. JFileChooser 20
21. JFileChooser 21
22. Swing Menu 22
23. Swing Menu import java.awt.*; import java.awt.event.*; import javax.swing.JMenu; import javax.swing.JMenuItem; import javax.swing.JCheckBoxMenuItem; import javax.swing.JRadioButtonMenuItem; import javax.swing.ButtonGroup; import javax.swing.JMenuBar; import javax.swing.KeyStroke; import javax.swing.ImageIcon; import javax.swing.JPanel; import javax.swing.JTextArea; import javax.swing.JScrollPane; import javax.swing.JFrame; 23
24. Swing Menu public class MenuLookDemo { JTextArea output; JScrollPane scrollPane; public JMenuBar createMenuBar() { JMenuBar menuBar; JMenu menu, submenu; JMenuItem menuItem; JRadioButtonMenuItem rbMenuItem; JCheckBoxMenuItem cbMenuItem; //Create the menu bar. menuBar = new JMenuBar(); //Build the first menu. menu = new JMenu("A Menu"); menu.setMnemonic(KeyEvent.VK_A); menu.getAccessibleContext().setAccessibleDescription( "The only menu in this program that has menu items"); menuBar.add(menu); 24
25. Swing Menu //a group of JMenuItems menuItem = new JMenuItem("A text-only menu item", KeyEvent.VK_T); //menuItem.setMnemonic(KeyEvent.VK_T); //used constructor instead menuItem.setAccelerator(KeyStroke.getKeyStroke( KeyEvent.VK_1, ActionEvent.ALT_MASK)); menuItem.getAccessibleContext().setAccessibleDescription( "This doesn't really do anything"); menu.add(menuItem); ImageIcon icon = createImageIcon("images/middle.gif"); menuItem = new JMenuItem("Both text and icon", icon); menuItem.setMnemonic(KeyEvent.VK_B); menu.add(menuItem); menuItem = new JMenuItem(icon); menuItem.setMnemonic(KeyEvent.VK_D); menu.add(menuItem); 25
26. Swing Menu //a group of radio button menu items menu.addSeparator(); ButtonGroup group = new ButtonGroup(); rbMenuItem = new JRadioButtonMenuItem("A radio button menu item"); rbMenuItem.setSelected(true); rbMenuItem.setMnemonic(KeyEvent.VK_R); group.add(rbMenuItem); menu.add(rbMenuItem); rbMenuItem = new JRadioButtonMenuItem("Another one"); rbMenuItem.setMnemonic(KeyEvent.VK_O); group.add(rbMenuItem); menu.add(rbMenuItem); 26
27. //a group of check box menu items menu.addSeparator();Swing Menu cbMenuItem = new JCheckBoxMenuItem("A check box menu item"); cbMenuItem.setMnemonic(KeyEvent.VK_C); menu.add(cbMenuItem); cbMenuItem = new JCheckBoxMenuItem("Another one"); cbMenuItem.setMnemonic(KeyEvent.VK_H); menu.add(cbMenuItem); //a submenu menu.addSeparator(); submenu = new JMenu("A submenu"); submenu.setMnemonic(KeyEvent.VK_S); menuItem = new JMenuItem("An item in the submenu"); menuItem.setAccelerator(KeyStroke.getKeyStroke( KeyEvent.VK_2, ActionEvent.ALT_MASK)); submenu.add(menuItem); menuItem = new JMenuItem("Another item"); submenu.add(menuItem); menu.add(submenu); 27
28. //Build second menu in the menu bar. menu = new JMenu("Another Menu"); menu.setMnemonic(KeyEvent.Swing Menu VK_N); menu.getAccessibleContext().setAccessibleDescription( "This menu does nothing"); menuBar.add(menu); return menuBar; } public Container createContentPane() { //Create the content-pane-to-be. JPanel contentPane = new JPanel(new BorderLayout()); contentPane.setOpaque(true); //Create a scrolled text area. output = new JTextArea(5, 30); output.setEditable(false); scrollPane = new JScrollPane(output); //Add the text area to the content pane. contentPane.add(scrollPane, BorderLayout.CENTER); return contentPane; 28 }
29. / Returns an ImageIcon, or null if the path was invalid. */ protected static ImageIcon createImageIcon(String path) { java.net.URLSwing MenuimgURL = MenuLookDemo. class.getResource(path); if (imgURL != null) { return new ImageIcon(imgURL); } else { System.err.println("Couldn't find file: " + path); return null; } } / Create the GUI and show it. For thread safety, * this method should be invoked from the * event-dispatching thread. */ private static void createAndShowGUI() { //Create and set up the window. JFrame frame = new JFrame("MenuLookDemo"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //Create and set up the content pane. MenuLookDemo demo = new MenuLookDemo(); frame.setJMenuBar(demo.createMenuBar()); frame.setContentPane(demo.createContentPane()); //Display the window. frame.setSize(450, 260); frame.setVisible(true); 29 }
30. publicSwing static voidMenu main(String[] args) { //Schedule a job for the event-dispatching thread: //creating and showing this application's GUI. javax.swing.SwingUtilities.invokeLater(new Runnable() { public void run() { createAndShowGUI(); } }); } } 30