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reading the value of jtable selected row

I am working with java RMI and swing and I have read the values from database but i am unable to read the value of selected row in this code. What i want to JTable to show all databases and it is showing all the available databases in server but i am unable to read the selected row value in this
package schoolclient;
import javax.swing.*;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
import javax.swing.table.*;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.util.*;
import schoolserver.SchoolInterface;
public class DatabaseList {
JFrame jFrame = null;
JPanel jPanel = null;
JList jList = null;
JTable jTable = null;
String data = null;
schoolserver.SchoolInterface schoolInt = null;
public DatabaseList(SchoolInterface sii) {
schoolInt = sii;
jFrame = new JFrame();
jTable = new JTable(){
public boolean isCellEditable(int row, int column) {
return false;
}
};
jTable.setModel(createTable());
jTable.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
jTable.addMouseListener(new MouseAdapter() {
public void MouseClicked(MouseEvent e) {
if(SwingUtilities.isLeftMouseButton(e) && (e.getClickCount() == 2)) {
new createListSelection();
}
}
});
JScrollPane scrollPane = new JScrollPane(jTable);
jFrame.add(scrollPane);
jFrame.setSize(200, 200);
jFrame.setVisible(true);
}
private DefaultTableModel createTable() {
DefaultTableModel dtm = new DefaultTableModel();
dtm.addColumn("Databases", createArray());
return dtm;
}
private class createListSelection implements ListSelectionListener {
#Override
public void valueChanged(ListSelectionEvent e) {
if(!e.getValueIsAdjusting()) {
ListSelectionModel lsm = jTable.getSelectionModel();
data = (String) jTable.getValueAt(jTable.getSelectedRow(), 0);
System.out.println(data);
}
}
}
Object[] createArray() {
ArrayList<Object> al = null;
Object[] x = null;
try {
al = schoolInt.availableDatabases();
x = new Object[al.size()];
int i = 0;
for(Object o : schoolInt.availableDatabases())
x[i++] = o;
}
catch(Exception e) {
JOptionPane.showMessageDialog(null, "no connection to database or "
+ "remote server availabe", "Server Information", JOptionPane.OK_OPTION);
}
return x;
}
}

You look to be over-complicating things. Don't re-add listeners within a listener, but rather simply add one listener, a MouseListener to the JTable, and add it once. Within it check for double clicks (presses) and respond. Something like:
jTable.addMouseListener(new MouseAdapter() {
#Override
public void mousePressed(MouseEvent e) {
if (e.getButton() == MouseEvent.BUTTON1 && e.getClickCount() == 2) {
data = (String) jTable.getValueAt(jTable.getSelectedRow(), 0);
System.out.println(data);
}
}
});
Other problems, your method within your MouseAdapter will never be called, ever:
jTable.addMouseListener(new MouseAdapter() {
public void MouseClicked(MouseEvent e) {
// ....
}
});
Your capitalization is wrong, and since MouseAdapter/MouseListener does not have a MouseClicked method (it is mouseClicked) this method is never called. Always place an #Override annotation above any method that you think might be an override, and let the compiler warn you if it is not so. Had you done this, you'd get a prompt warning from the compiler.
Regarding your comment
You never add a selection listener to the JTable. Again the method within the MouseAdapter is never called since it is not capitalized correctly
Even if it did get called, what use is there repeatedly adding a ListSelectionListener?
If your goal is to only respond to double-clicks, a ListSelectionListener is not what you want. Only a MouseListener would work in this situation.
Do read the appropriate tutorials as they explain all of this and well. Please check out the links to be found within the Swing Info tag.

Trouble with listener in Java. I have a drop down box not passing the users selection like I need

I have a project for class due this Wednesday and am having trouble with a few things: I have two if else statements that control the values presented in two different drop down menus. To me, it appears I'm not getting the information of of the previous drop down(there are two drop downs in which affects the values presented in the next).
Here's my code thus far:
///Occupancy///
JLabel label2 = new JLabel("Please Select the Number of Occupants");
JComboBox occupancy_list = new JComboBox(occupancy_string);
occupancy_list.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent event)//Listener for Occupancy Drop Down
{
JComboBox cb = (JComboBox)event.getSource(); //grab the user selection
String selection = (String) cb.getSelectedItem();
int number = Integer.parseInt((String) selection);
}
});
String selection = (String) occupancy_list.getSelectedItem();
int number = Integer.parseInt((String) selection);
if(number>2)
{
style=(style2);
}
else
{
style=(style1);
}
///Room Type///
JLabel label3 = new JLabel("Please Select a Room Style");
//Creates RoomStyle Drop Down
JComboBox room_type = new JComboBox(style);
roomtype_string=(String) room_type.getSelectedItem();
room_type.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent event)//Listener for Room Style Drop Down
{
JComboBox cb = (JComboBox)event.getSource(); //grab the user selection
String selection = (String) cb.getSelectedItem();
}
});
String selection2 = (String) room_type.getSelectedItem();
if(selection2.equals("Cabin"))
{
room_number=(cabin_string);
}
else
{
room_number=(suite_string);
}
///Room Selection///
JLabel label4 = new JLabel("Please Select a Room");
//Creates RoomNumber Drop Down
JComboBox room_list = new JComboBox(room_number);
roomselected = (String) room_list.getSelectedItem();
room_list.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent event)//Listener for Occupancy Drop Down
{
JComboBox cb = (JComboBox)event.getSource(); //grab the user selection
String selection = (String) cb.getSelectedItem();
}
});
String selection3 = (String) room_list.getSelectedItem();
//Dining
JLabel label5 = new JLabel("Please Select a Dining Time");
JComboBox dining_list = new JComboBox(dining_string);
dining_list.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent event)//Listener for Occupancy Drop Down
{
JComboBox cb = (JComboBox)event.getSource(); //grab the user selection
String selection = (String) cb.getSelectedItem();
}
});
String selection4 = (String) dining_list.getSelectedItem();
NOTE: I have since rewritten my code, still no dice:
` //Creates subPanel2 with Occupancy, Room Type, Room, and Dining Time request
JPanel subpanel = new JPanel();
///Occupancy///
JLabel label2 = new JLabel("Please Select the Number of Occupants");
JComboBox occupancy_list = new JComboBox(occupancy_string);
Occupancy_Listener occupancy = new Occupancy_Listener();
occupancy_list.addActionListener(occupancy);
//updateStyle(occupancy_string[occupancy_list.getSelectedIndex()]);
///Room Type///
JLabel label3 = new JLabel("Please Select a Room Style");
//Creates RoomStyle Drop Down
JComboBox room_type = new JComboBox(style);
Style_Listener styleListen = new Style_Listener();
room_type.addActionListener(styleListen);
//updateNumber(style[room_type.getSelectedIndex()]);
///Room Selection///
JLabel label4 = new JLabel("Please Select a Room");
//Creates RoomNumber Drop Down
JComboBox room_list = new JComboBox(room_number);
Room_Listener room = new Room_Listener();
room_list.addActionListener(room);
//updateRoom(room_number[room_list.getSelectedIndex()]);
//Dining
JLabel label5 = new JLabel("Please Select a Dining Time");
JComboBox dining_list = new JComboBox(dining_string);
Din_Listener dining = new Din_Listener();
dining_list.addActionListener(dining);
//updateDin(dining_string[dining_list.getSelectedIndex()]);
...
...
...
...
...
}
private class Occupancy_Listener implements ActionListener
{
public void actionPerformed(ActionEvent event)//Listener for Occupancy Drop Down
{
JComboBox cb = (JComboBox)event.getSource(); //grab the user selection
String selection = (String) cb.getSelectedItem();
System.out.println(selection);
System.out.println(style[0]);
System.out.println(room_number[0]);
updateStyle(selection);
}
}
private class Style_Listener implements ActionListener
{
public void actionPerformed(ActionEvent event)//Listener for Occupancy Drop Down
{
JComboBox cb = (JComboBox)event.getSource(); //grab the user selection
String selection = (String) cb.getSelectedItem();
updateNumber(selection);
}
}
private class Room_Listener implements ActionListener
{
public void actionPerformed(ActionEvent event)//Listener for Occupancy Drop Down
{
JComboBox cb = (JComboBox)event.getSource(); //grab the user selection
String selection = (String) cb.getSelectedItem();
updateRoom(selection);
}
}
private class Din_Listener implements ActionListener
{
public void actionPerformed(ActionEvent event)//Listener for Occupancy Drop Down
{
JComboBox cb = (JComboBox)event.getSource(); //grab the user selection
String selection = (String) cb.getSelectedItem();
updateDin(selection);
}
}
protected void updateStyle(String pick)
{
String[] style1 ={"Cabin", "Suite"};
String[] style2 ={"Suite"};
//ocu_string=pick;
number = Integer.parseInt(pick);
if(number>2)
{
style=style2;
}
else
{
style=style1;
}
}
protected void updateNumber(String pick)
{
String[] cabin_string = {"11-1","11-2","11-3","11-4","11-5","11-6","11-7","11-8","11-9","11-10"};
String[] suite_string = {"11-S1","11-S2"};
type=pick;
if(type.equals("cabin"))
{
room_number=cabin_string;
}
else
{
room_number=suite_string;
}
}
protected void updateRoom(String pick)
{
room_num=pick;
}
protected void updateDin(String pick)
{
din_time=pick;
}
//public String getPopulation()
{
//return ocu_string;
}

This might be what your are asking. You select an item from the first combo box and it populates items in a second combo box:
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
public class ComboBoxTwo extends JPanel implements ActionListener
{
private JComboBox<String> mainComboBox;
private JComboBox<String> subComboBox;
private Hashtable<String, String[]> subItems = new Hashtable<String, String[]>();
public ComboBoxTwo()
{
String[] items = { "Select Item", "Color", "Shape", "Fruit" };
mainComboBox = new JComboBox<String>( items );
mainComboBox.addActionListener( this );
// prevent action events from being fired when the up/down arrow keys are used
mainComboBox.putClientProperty("JComboBox.isTableCellEditor", Boolean.TRUE);
add( mainComboBox );
// Create sub combo box with multiple models
subComboBox = new JComboBox<String>();
subComboBox.setPrototypeDisplayValue("XXXXXXXXXX"); // JDK1.4
add( subComboBox );
String[] subItems1 = { "Select Color", "Red", "Blue", "Green" };
subItems.put(items[1], subItems1);
String[] subItems2 = { "Select Shape", "Circle", "Square", "Triangle" };
subItems.put(items[2], subItems2);
String[] subItems3 = { "Select Fruit", "Apple", "Orange", "Banana" };
subItems.put(items[3], subItems3);
}
public void actionPerformed(ActionEvent e)
{
String item = (String)mainComboBox.getSelectedItem();
Object o = subItems.get( item );
if (o == null)
{
subComboBox.setModel( new DefaultComboBoxModel() );
}
else
{
subComboBox.setModel( new DefaultComboBoxModel( (String[])o ) );
}
}
private static void createAndShowUI()
{
JFrame frame = new JFrame("SSCCE");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add( new ComboBoxTwo() );
frame.setLocationByPlatform( true );
frame.pack();
frame.setVisible( true );
}
public static void main(String[] args)
{
EventQueue.invokeLater(new Runnable()
{
public void run()
{
createAndShowUI();
}
});
}
}

You may be confused by the fact that code inside anonymous classes (or local classes) is not executed at the same time as the code around it.
So in a code that looks like:
A a = new A();
a.setSomething( new B() {
public void bMethod() {
// Run stuff
}
} );
C c = a.getSomething();
The "Run stuff" part is not ran now. An object is created, with a method that can be used later inside it, and that object is passed into a. The method is not going to run until something specifically calls it. When you get to the getSomething(), the "Run stuff" part has not run.
So in your code:
JComboBox occupancy_list = new JComboBox(occupancy_string);
occupancy_list.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent event)//Listener for Occupancy Drop Down
{
JComboBox cb = (JComboBox)event.getSource(); //grab the user selection
String selection = (String) cb.getSelectedItem();
int number = Integer.parseInt((String) selection);
}
});
String selection = (String) occupancy_list.getSelectedItem();
You create the occupancy list, you create an action listener for it, and store that action listener inside your occupancy list. But none of the stuff written inside the actionPerformed() method is going to run until the GUI is displayed, the user selects something, and the event is fired.
GUI programming is different than console programming where you call "scan()" and then the program just stops and waits for something to be entered. You first prepare the GUI, and when you display it, the various listeners are called based on what the user does.
So your code jumps straight to the occupancy_list.getSelectedItem() before the list has even been added to the GUI, and of course, nothing is selected, nothing is displayed, yet, so the other drop-down lists are created way before the user even sees the GUI.
This is true for all the action listeners in the code.
The proper way to write an action listener is to think what will be the conditions when the GUI is already running. Your action listeners merely set values in local variables that are going to be discarded. Instead, they should do the things that you want to do when the user makes a selection, right inside the action listener.
This means that the action listener for this combo box will have to create the other lists and add them to the GUI, revalidate and repaint it. Or it may simply modify the other lists which will be created already, depending on what you think is best. But they will have to access those lists, and therefore the lists have to be defined as fields of the surrounding class, and accessed inside the action listener. Note that you can also define a method that does this and call it from inside the action listener.
My suggestion would be to create a simple GUI first with just the first combo box and make it change something simple based on the selection. You can follow the Oracle Tutorial, for example. After you understand how to write an action listener that changes something simple, expand your program to add the other lists and manipulate them from the action listener.

Set JRadioButton to true based on a JLabel

I have two JFrames, the first one is used to display SQL table using JTable and the second one is used to update the data on the SQL table. On the first frame, there's a button used to show the second frame and it has radio buttons. However, I can't set it to true. What I want to happen is set the radio button to true based on what value I get from a Label where the Label's value came from the database. Here's what I have done:
FIRST JFRAME:
private void btnUpdateActionPerformed(java.awt.event.ActionEvent evt) {
String hours = null;
try
{
DbUpdate up = new DbUpdate();
// To connect on SQL and get the JTable's value
int get = (int)jTable2.getModel().getValueAt(jTable2.getSelectedRow(), 0);
String query= "SELECT * FROM roominfo WHERE CustomerNo = '"+get+"' " ;
String url = "jdbc:mysql://localhost:3306/adve";
Connection conn = DriverManager.getConnection(url,"root","sa");
Statement st = conn.createStatement();
rs = st.executeQuery(query);
while(rs.next())
{
hours= rs.getString("Hours"); // This is where I can get the value for hours and to be passed on a label
}
up.jLabel12.setText(hours); //I set on a Jlabel for the next frame
}
catch(SQLException e){
JOptionPane.showMessageDialog(null, "Please select a record to update");
}
}
SECOND JFRAME:
public void set(){ //THIS SUPPOSE TO SET THE BUTTONS BASED ON THE VALUE OF THE LABEL
if (jLabel12.getText().equals("12-Hours")) { // if 12-Hours, Rdn12 should be true or selected
Rdn12.isSelected();
Rdn12.setSelected(true);
Rdn24.setSelected(false);
}
else if (jLabel12.getText().equals("24-Hours")) { // if 24-Hours, Rdn24 should be true or selected
Rdn12.setSelected(false);
Rdn24.setSelected(true);
}
jTextField1.setEditable(false);
jLabel20.setVisible(false);
}
However, The radiobutton still won't get selected. What am I doing wrong? Any suggestions? Please help.

UPDATE: I don't know, whether I did quite understand your question. Is this application kind of what you were looking for?
import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.ListSelectionModel;
import javax.swing.SwingUtilities;
import javax.swing.WindowConstants;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
import javax.swing.table.DefaultTableModel;
public class DatabaseRadioButtons extends JFrame {
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
#Override
public void run() {
new DatabaseRadioButtons().setVisible(true);
}
});
}
JTable table = new JTable();
JButton showSecondFrame = new JButton("Show second frame");
SecondFrame secondFrame = new SecondFrame();
public DatabaseRadioButtons() {
table.setModel(new DefaultTableModel(new Object[][] {
new Object[] { "first", "entry" },
new Object[] { "second", "entry" } }, new Object[] { "column",
"names" }));
ListSelectionModel selectionModel = table.getSelectionModel();
selectionModel.addListSelectionListener(new ListSelectionListener() {
#Override
public void valueChanged(ListSelectionEvent e) {
if (e.getValueIsAdjusting())
return; // ignore this event, if we expect another event
// right after this one
int selectedRow = table.getSelectedRow();
refreshRadioButtonsAccordingToDatabaseValues(selectedRow);
}
});
showSecondFrame.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
SwingUtilities.invokeLater(new Runnable() {
#Override
public void run() {
secondFrame.setVisible(true);
}
});
}
});
JPanel panel = new JPanel(new BorderLayout());
panel.add(new JScrollPane(table), BorderLayout.CENTER);
panel.add(showSecondFrame, BorderLayout.SOUTH);
setContentPane(panel);
setSize(400, 300);
setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
}
protected void refreshRadioButtonsAccordingToDatabaseValues(int selectedRow) {
String databaseValue;
// put you database SELECT here, instead of this fixed value
System.out.println("Make Database select for row " + selectedRow);
databaseValue = selectedRow == 0 ? "12-Hours" : "24-Hours";
// Choose what to do, according to database values
if (databaseValue.equals("12-Hours")) {
// you can change the fields of the second frame directly in here
secondFrame.Rdn12.isSelected();
secondFrame.Rdn12.setSelected(true);
secondFrame.Rdn24.setSelected(false);
} else if (databaseValue.equals("24-Hours")) {
secondFrame.Rdn12.setSelected(false);
secondFrame.Rdn24.setSelected(true);
}
}
}
class SecondFrame extends JFrame {
JRadioButton Rdn12 = new JRadioButton("Radio 12");
JRadioButton Rdn24 = new JRadioButton("Radio 24");
public SecondFrame() {
setSize(400, 300);
setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
setLocation(100, 100);
JPanel panel = new JPanel(new GridLayout(10, 1));
panel.add(Rdn12);
panel.add(Rdn24);
setContentPane(panel);
}
}
You can change a value of a Label in your Second Frame, but you don't necessarily have to. As my example shows you can just change your checkboxes of your second frame from within the code of your first frame.
Update the refreshRadioButtonsAccordingToDatabaseValues() method to read actual data from your database.

You should do something like this:
private void btnUpdateActionPerformed(java.awt.event.ActionEvent evt) {
String hours = null;
try
{
DbUpdate up = new DbUpdate();
int get = (int)jTable2.getModel().getValueAt(jTable2.getSelectedRow(), 0);
String query= "SELECT * FROM roominfo WHERE CustomerNo = '"+get+"' " ;
String url = "jdbc:mysql://localhost:3306/adv";
Connection conn = DriverManager.getConnection(url,"root","sa");
Statement st = conn.createStatement();
rs = st.executeQuery(query);
while(rs.next())
{
hours= rs.getString("Hours");
}
if (hours.equals("12-Hours")) {
// you can change the fields of the second frame directly in here
up.Rdn12.isSelected();
up.Rdn12.setSelected(true);
up.Rdn24.setSelected(false);
} else if (hours.equals("24-Hours")) {
up.Rdn24.isSelected();
up.Rdn12.setSelected(false);
up.Rdn24.setSelected(true);
}
}
catch(Exception e){
JOptionPane.showMessageDialog(null, "Please select a record to update");
}
}

dynamic Jtree from database

I have a database table named tree1, which has a table names student_details.This table has 3 columns student_name,student_details,student_phone
Now, am able to retrieve student details from the database but only in static way.
Question is when I insert a new student detail row {student_name,student_details,student_phone} I want it to show on my Jtree. Although Hashmap is the solution I am not able to understand how to use hashmap in a Jtree to create dynamic nodes.
below is the code from which I could do a static Jtree, and i want to make it dynamic. Can anyone tell me how to do this with a code sample?
package tree_try;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.FocusEvent;
import java.awt.event.FocusListener;
import java.beans.Statement;
import java.sql.*;
import java.util.ArrayList;
import java.util.Iterator;
import javax.swing.*;
import javax.swing.event.TreeSelectionEvent;
import javax.swing.event.TreeSelectionListener;
import javax.swing.tree.*;
public class SimpleTree extends JFrame
{
public Connection connect = null;
public Statement statement = null;
public Statement statement2 = null;
public Statement statement3 = null;
public Statement statement4 = null;
public Statement statement5 = null;
public Statement statement6 = null;
public ResultSet resultSet = null;
public ResultSet resultSet2 = null;
public ResultSet resultSet3 = null;
public ResultSet resultSet4 = null;
public ResultSet resultSet5 = null;
public ResultSet resultSet6 = null;
public ArrayList arrayList = new ArrayList();
public ArrayList arrayList2 = new ArrayList();
public ArrayList arrayList3 = new ArrayList();
public ArrayList arrayList4 = new ArrayList();
static String store[] = new String[10];
static String store2[] = new String[10];
static String store3[] = new String[10];
//for the panel
static String store4[] = new String[10];
static String store5[] = new String[10];
static String store6[] = new String[10];
static String store7[] = new String[10];
//for panel over
int i=0;
int i1=0;
int i2=0;
int i3=0;
JPanel jp1 = new JPanel();
JPanel jp2 = new JPanel();
JFrame jf1 = new JFrame();
JButton jb1 = new JButton("Save");
JButton jb2 = new JButton("Cancel");
JTextField jt1= new JTextField();
JTextField jt2 = new JTextField();
JTextField jt3= new JTextField();
JTextField jt4 = new JTextField();
JLabel jl0 = new JLabel();
JLabel jl1 = new JLabel("Name : ");
JLabel jl2 = new JLabel("Adress : ");
JLabel jl3 = new JLabel("Phone Number : ");
JLabel jl4 = new JLabel("Other Deatils : ");
JLabel jl5 = new JLabel("");
public static void main(String[] args)
{
new SimpleTree();
}
public SimpleTree()
{
super("Schools database");
WindowUtilities.setNativeLookAndFeel();
addWindowListener(new ExitListener());
//db part
try
{
Class.forName("org.apache.derby.jdbc.ClientDriver").newInstance();
connect = DriverManager.getConnection("jdbc:derby://localhost:1527/treedata1","suraj","suraj");
PreparedStatement statement = connect.prepareStatement("SELECT * from school_details");
PreparedStatement statement2 = connect.prepareStatement("select student_name from student_details where s_id =1");
PreparedStatement statement3 = connect.prepareStatement("select student_name from student_details where s_id =2");
//for the panel display
//PreparedStatement statement5 = connect.prepareStatement("select student_name from student_details where s_id =1");
//PreparedStatement statement6 = connect.prepareStatement("select student_name from student_details where s_id =2");
resultSet = statement.executeQuery();
while (resultSet.next())
{
String sname = resultSet.getString("school_name");
String sid = resultSet.getString("s_id");
arrayList.add(sname);
System.out.println("this is stsement one"+sname);
//arrayList.add(number);
}
resultSet2 = statement2.executeQuery();
while (resultSet2.next())
{
String user2 = resultSet2.getString("student_name");
//int number2 = resultSet2.getInt("s_id");
arrayList2.add(user2);
System.out.println("this is stsement two"+user2);
}
// System.out.println(arrayList);
resultSet3 = statement3.executeQuery();
while (resultSet3.next())
{
String user3 = resultSet3.getString("student_name");
//int number2 = resultSet2.getInt("s_id");
arrayList3.add(user3);
System.out.println("this is stsement three"+user3);
}
System.out.println("this is after statement 3 before 4");
}
catch (Exception e2)
{
e2.printStackTrace();
}
//
Iterator it = arrayList.iterator();
while (it.hasNext())
{
store[i]= (String) it.next();
i++;
//System.out.println(it.next());
}
Iterator it2 = arrayList2.iterator();
while (it2.hasNext())
{
store2[i1]= (String) it2.next();
i1++;
//System.out.println(it.next());
}
Iterator it3 = arrayList3.iterator();
while (it3.hasNext())
{
store3[i2]= (String) it3.next();
i2++;
// System.out.println(it.next());
}
// ------------------------- Visible Settings start here --------------------//
Object[] hierarchy ={"Click for schools",new Object[] {store[0],new Object[] { "Student Details",store2[0],store2[1] } },new Object[] { store[1],new Object[] { "Student Details",store3[0],store3[1]}}};
DefaultMutableTreeNode root = processHierarchy(hierarchy);
final JTree tree = new JTree(root);
// setSize(275, 300);
jp1.setSize(50,50);
jp1.setBackground(Color.WHITE);
jf1.setExtendedState(Frame.MAXIMIZED_BOTH);
jf1.setLayout(new GridLayout(1,2));
jf1.setVisible(true);
jf1.add(new JScrollPane(tree), BorderLayout.WEST);
jf1.add(jp1);
jp1.setLayout(null);
jl0.setBounds(10,1,500,100);
jp1.add(jl0);
jl1.setBounds(55,90,150,100);
jt1.setBounds(225,130, 155, 25);
jp1.add(jl1);
jp1.add(jt1);
jl2.setBounds(55,160, 150, 100);
jt2.setBounds(225,200, 155, 25);
jp1.add(jl2);
jp1.add(jt2);
jl3.setBounds(55,230,150,100);
jt3.setBounds(225,270, 155, 25);
jp1.add(jl3);
jp1.add(jt3);
jl4.setBounds(55,295, 150, 100);
jt4.setBounds(225,330, 155, 25);
jp1.add(jl4);
jp1.add(jt4);
jb1.setEnabled(false);
jb2.setEnabled(false);
jb1.setBounds(150,430, 100, 50);
jb2.setBounds(350,430, 100, 50);
jp1.add(jb1);
jp1.add(jb2);
//-----------------Visible setting stop here--------------------------//
//------------------- Element actions here------------------------//
jt1.addFocusListener(new FocusListener() {
#Override
public void focusGained(FocusEvent e)
{
jb1.setEnabled(true);
jb2.setEnabled(true);
}
#Override
public void focusLost(FocusEvent e)
{
jb1.setEnabled(false);
jb2.setEnabled(false);
}
});
//now for the tree
tree.addTreeSelectionListener(new TreeSelectionListener() {
#Override
public void valueChanged(TreeSelectionEvent e) {
jf1.dispose();
//jl0.setText("Displaying information About : "+tree.getLastSelectedPathComponent().toString());
store7[0]= tree.getLastSelectedPathComponent().toString();
System.out.println("in store 7 of 0"+store7[0]);
dbaction db = new dbaction(store7[0]);
}
});
}
//------------------------------------end of action listening-------------------------
private DefaultMutableTreeNode processHierarchy(Object[] hierarchy)
{
DefaultMutableTreeNode node = new DefaultMutableTreeNode(hierarchy[0]);DefaultMutableTreeNode child;
for(int i=1; i<hierarchy.length; i++)
{
Object nodeSpecifier = hierarchy[i];
if (nodeSpecifier instanceof Object[]) // Ie node with children
child = processHierarchy((Object[])nodeSpecifier);
else
child = new DefaultMutableTreeNode(nodeSpecifier); // Ie Leaf
node.add(child);
}
return(node);
}
private void close()
{
try {
if (resultSet != null)
{
resultSet.close();
}
if (statement != null)
{
//statement.
}
if (connect != null)
{
connect.close();
}
}
catch (Exception e3)
{
e3.printStackTrace();
}
}
}
of course dbaction.java is where I connect to the database and get details.

It is best to create a data model for the tree. How to Use Trees tutorial has good examples. Also go through Understanding the TreeModel for more details.
By the way, don't execute long running tasks such as accessing database on Event Dispatch Thread . Look into SwingWorker for such tasks.

The JTree tutorial to which Max linked has a section covering 'Dynamic updates of a JTree' which contains the necessary snippets on how to update a TreeModel. The basic idea is that you update the model behind the JTree (the TreeModel) and fire the correct events from the TreeModel. The JTree will listen for those events and update itself accordingly.
Next to that, some other advise:
You should only access Swing components on the Event Dispatch Thread (EDT), which is currently not the case in your example. See the Concurrency in Swing tutorial for more information
The moment you adjust your main method to run on the EDT, you should avoid the long running taks (the database access), as it will block the EDT and leave you with an unresponsive UI (as Max already indicated).
You should avoid the null layout and the manual placing of all your components using setBounds. Otherwise simple things like resizing the UI will results in a messed-up layout. Use a LayoutManager instead. The usage of LayoutManagers is also covered in the 'LayoutManager tutorial' on the Oracle site.

How to provide pagination support to a JTable in Swing?

I have created one GUI in Swing Java in which I have used JTable.Now I want to display next page information into it by using pagination. How should I do that ?

Another option to implement this is to use a scrollbar-less scrollpane and a couple nav buttons to effect the control. The buttons that have been added are normal JButtons for the prototype.
A quick prototype is added below. It makes a couple assumptions, one of which is that the table model has all of its data. Work could be done to ensure that rows end up flush at the top of the view upon navigation.
private void buildFrame() {
frame = new JFrame("Demo");
frame.setSize(300, 300);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
addStuffToFrame();
frame.setVisible(true);
}
private void addStuffToFrame() {
final JTable table = getTable();
final JScrollPane scrollPane = new JScrollPane(table);
scrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_NEVER);
final JButton next = new JButton("next");
final JButton prev = new JButton("prev");
ActionListener al = new ActionListener(){
public void actionPerformed(ActionEvent e) {
Rectangle rect = scrollPane.getVisibleRect();
JScrollBar bar = scrollPane.getVerticalScrollBar();
int blockIncr = scrollPane.getViewport().getViewRect().height;
if (e.getSource() == next) {
bar.setValue(bar.getValue() + blockIncr);
} else if (e.getSource() == prev) {
bar.setValue(bar.getValue() - blockIncr);
}
scrollPane.scrollRectToVisible(rect);
}
};
next.addActionListener(al);
prev.addActionListener(al);
JPanel panel = new JPanel(new BorderLayout());
JPanel buttonPanel = new JPanel();
buttonPanel.add(prev);
buttonPanel.add(next);
panel.add(buttonPanel, BorderLayout.NORTH);
panel.add(scrollPane, BorderLayout.CENTER);
frame.getContentPane().add(panel);
}
private JTable getTable() {
String[] colNames = new String[]{
"col 0", "col 1", "col 2", "col 3"
};
String[][] data = new String[100][4];
for (int i = 0; i < 100; i++) {
for (int j = 0; j < 4; j++) {
data[i][j] = "r:" + i + " c:" + j;
}
}
return new JTable(data,colNames);
}
alt text http://img7.imageshack.us/img7/4205/picture4qv.png

Paging in a Swing JTable looks like a nice article.
Here is an excerpt:
As far as I remember the solution for this problem lies in the concept of paging: just retrieve the data that the user wants to see and nothing more. This also means you have to sometimes get extra data from the db server (or appserver) if your user scrolls down the list.
Big was my surprise that there wasn't really an out-of-the-box solution (not even a copy- paste solution) for this problem. Anyone that knows one, please don't hesitate to extend my (rather limited) knowledge of the J2EE platform.
So we dug in, and tried to build a solution ourselves.
What we eventually came up with was an adapted TableModel class to takes care of the paging.

You can try with 2 query, first query is to count total rows in DB and second query is for the real data :) And for the UI side, you can try like this:
public class MainForm extends javax.swing.JFrame {
private void initDefaultValue() {
rowsPerPage = Integer.valueOf(cmbPageSize.getSelectedItem().toString());
totalRows = Main.getTablePagingService().countComments();
Double dblTotPage = Math.ceil(totalRows.doubleValue()/rowsPerPage.doubleValue());
totalPage = dblTotPage.intValue();
if (pageNumber == 1) {
btnFirst.setEnabled(false);
btnPrevious.setEnabled(false);
} else {
btnFirst.setEnabled(true);
btnPrevious.setEnabled(true);
}
if (pageNumber.equals(totalPage)) {
btnNext.setEnabled(false);
btnLast.setEnabled(false);
} else {
btnNext.setEnabled(true);
btnLast.setEnabled(true);
}
txtPageNumber.setText(String.valueOf(pageNumber));
lblPageOf.setText(" of " + totalPage + " ");
lblTotalRecord.setText("Total Record " + totalRows + " rows.");
List wPComments = Main.getTablePagingService().findAllComment(pageNumber, rowsPerPage);
jTable1.setModel(new CommentTableModel(wPComments));
autoResizeColumn(jTable1);
}
private void btnFirstActionPerformed(ActionEvent evt) {
pageNumber = 1; initDefaultValue();
}
private void btnPreviousActionPerformed(ActionEvent evt) {
if (pageNumber > 1) {
pageNumber -= 1; initDefaultValue();
}
}
private void btnNextActionPerformed(ActionEvent evt) {
if (pageNumber
And in service layer, you just need use limit function like this :
public List findAllComment(Integer pageNumber, Integer rowsPerPage) {
try {
List listWP = new ArrayList();
preparedFindAll.setInt(1, (rowsPerPage*(pageNumber-1)));
preparedFindAll.setInt(2, rowsPerPage);
ResultSet rs = preparedFindAll.executeQuery();
while (rs.next()) {
WPComment comment = new WPComment();
comment.setCommentID(rs.getInt("comment_ID"));
comment.setCommentAuthor(rs.getString("comment_author"));
comment.setCommentDate(rs.getDate("comment_date"));
comment.setCommentContent(rs.getString("comment_content"));
listWP.add(comment);
}
return listWP;
} catch (SQLException ex) {
Logger.getLogger(TablePagingServiceJDBC.class.getName()).log(Level.SEVERE, null, ex);
}
return null;
}
public Integer countComments() {
try {
Integer totalRows = 0;
ResultSet rs = preparedCount.executeQuery();
while (rs.next()) {
totalRows = rs.getInt("count(*)");
}
return totalRows;
} catch (SQLException ex) {
Logger.getLogger(TablePagingServiceJDBC.class.getName()).log(Level.SEVERE, null, ex);
}
return 0;
}
Or you can fork me on github at Project Page Table Paging on Swing :)

I have written a Java pagination tool dataj. It uses JQuery dataTables plug-in pagination metadata to build up the result page.
I have also added some client classes for Java Swing including a TableRowSorter that calls the (server side) sorting instead of sorting inside the table model.
Feel free to download it and contact me if you have any questions. It's under Apache 2 license.

Alternatively, you can make use of the QuickTable project.
Screenshot
Here is the DBTable component in action:
The DBTable component is embedded in a traditionnal JFrame.
Sample code
The following sample code produces the window shown in the previous screenshot:
import javax.swing.JFrame;
import javax.swing.UIManager;
import quick.dbtable.DBTable;
public class QuickTableFrame extends JFrame {
private static final long serialVersionUID = -631092023960707898L;
public QuickTableFrame() {
try {
// Use system look and feel
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
// set Frame properties
setSize(300, 200);
setVisible(true);
setLocationRelativeTo(null);
setDefaultCloseOperation(EXIT_ON_CLOSE);
// create a new quicktable
DBTable dBTable1 = new DBTable();
// add to frame
getContentPane().add(dBTable1);
// set the database driver to be used, we are using jdbc-odbc driver
dBTable1.setDatabaseDriver("org.h2.Driver");
/*
* set the jdbc url,"quicktabledemo" is the data source we have
* created for the database
*/
dBTable1.setJdbcUrl("jdbc:h2:mem:test;INIT=create table employee as select * from CSVREAD('test.csv');");
// set the select statement which should be used by the table
dBTable1.setSelectSql("select * from employee");
// to create the navigation bars for the table
dBTable1.createControlPanel();
// connect to database & create a connection
dBTable1.connectDatabase();
// fetch the data from database to fill the table
dBTable1.refresh();
} catch (Exception e) {
e.printStackTrace();
}
}
public static void main(String[] args) {
// create a new table frame
QuickTableFrame myframe = new QuickTableFrame();
}
}
Resources and dependencies
test.csv
empid,emp_name,emp_dept,emp_salary
1,Azalia,ornare,114918
2,Jade,tristique,152878
3,Willa,In scelerisque scelerisque,166733
...
H2
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<version>1.4.187</version>
</dependency>
References
QuickTable basic tutorial
QuickTable official tutorials
Download latest jar
h2 database