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

LẬP TRÌNH JAVA CSDL

BÀI 3

COMPONENTS

Nguyễn Hữu Thể

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Nội dung

 JList
 JTable
 JMenu
 JOptionPane
 JFileChooser

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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);
list.setLayoutOrientation(JList.HORIZONTAL_WRAP);
list.setVisibleRowCount(-1);
...
JScrollPane listScroller = new JScrollPane(list);
listScroller.setPreferredSize(new Dimension(250, 80));


JList
 DefaultListModel
 Methods:
• addElement (Object e)
• get (int index)

• getSize ()
• getElementAt (int index)
• remove (int index)

• Elements()
• removeAllElements ()

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JList
 Methods:
– setModel (ListModel model), getModel ()
– getMaxSelectionIndex (), getMinSelectionIndex ()
– getSelectedIndex (), getSelectedIndices ()

– getSelectedValue (), getSelectedValues ()

 Events:
– valueChanged

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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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JTable
 Methods:
– setModel (TableModel tm)
– getModel ()
– getValueAt (int row, int col)

– getRowCount ()
– getColumnCount ()

 Events:
– mouseClicked

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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);
}

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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

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the setDataVector method.


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.
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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.
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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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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;

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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);

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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);

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