Bài giảng Lập trình Cơ sở dữ liệu – Java: Bài 3.2 - Nguyễn Hữu Thể

Bài giảng Lập trình cơ sở dữ liệu Java - Bài 3 tiếp tục cung cấp cho người học các kiến thức về Components. Nội dung chính được trình bày trong chương này gồm có: List JTable, JMenu, JOptionPane, JFileChooser. Mời các bạn cùng tham khảo nội dung chi tiết.

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

JList

Initializing a List

list = new JList(data); //data has type Object[]

list.setSelectionMode(ListSelectionModel.SINGLE_INTERVAL_SE LECTION);

• getElementAt (int index)

• remove (int index)

• Elements()

• removeAllElements ()

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JTable

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JOptionPane

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JTable

 DefaultTableModel

– addColumn (Object obj)

– addRow (Object obj)

– getColumnCount ()

– getRowCount ()

– getValueAt (int row, int col)

– setValueAt (Object obj, int row, int col)

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Object[][] cellData = {{ "1-1" , "1-2" }, { "2-1" , "2-2" }}; String[] columnNames = { "col1" , "col2" };

JTable table = new JTable(cellData, columnNames);

JFrame f = new JFrame();

JTable

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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

JTable

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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

Vector convertToVector( Returns a vector that contains the same objects as the array Object [] anArray)

JTable

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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

Vector convertToVector( Returns a vector that contains the same objects as the array Object [] anArray)

JOptionPane

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JOptionPane

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JOptionPane

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JFileChooser

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JFileChooser

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JFileChooser

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JFileChooser

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Swing Menu

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//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

Swing Menu

//a group of JMenuItems

menuItem = new JMenuItem( "A text-only menu item" ,

menu.add(menuItem);

ImageIcon icon = createImageIcon( "images/middle.gif" );

menuItem = new JMenuItem( "Both text and icon" , icon);

Swing Menu

//a group of radio button menu items

menu.addSeparator();

ButtonGroup group = new ButtonGroup();

rbMenuItem = new JRadioButtonMenuItem( "A radio button menu item" );

Swing Menu

//Build second menu in the menu bar

menu = new JMenu( "Another Menu" );

//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;

}

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Swing Menu

/** Returns an ImageIcon, or null if the path was invalid */

protected static ImageIcon createImageIcon(String path) {

java.net.URL imgURL = MenuLookDemo class getResource(path);

/*** 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();

Swing Menu

//Schedule a job for the event-dispatching thread:

//creating and showing this application's GUI

javax.swing.SwingUtilities.invokeLater( new Runnable() {

public void run() {