I need to remove rows form a JTable. I wrote the code like this:
DefaultTableModel dtm = (DefaultTableModel) jTable1.getModel();
int x = 0;
int row = dtm.getRowCount();
while(row>=x){
dtm.removeRow(x);
x++;
}
But it generates an error, like:
Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException:
24 >= 24
A simpler solution is to use:
dtm.setRowCount(0);
This is also more efficient since the table only needs to repaint itself once, after all the rows have been deleted.
You can try this:
while(row>x){
dtm.removeRow(x);
x++;
}
UPDATE
DefaultTableModel model = new DefaultTableModel();
JTable table = new JTable(model);
model.addColumn("Col1");
model.addColumn("Col2");
model.addRow(new Object[]{"1", "2"});
model.addRow(new Object[]{"1", "2"});
table.setModel(model);
for(int index = 0; index<table.getRowCount();)
{
model.removeRow(index);
}
With Java installed it is easier. Sorry about the wrong answer.
Related
I have an ArrayList<AbstractDrawablePoint> nodePoints which changes dynamically/can have anywhere from 1 to n number of points within it.
I would like to have a JTable fill dynamically based on the number of points within nodePoints. Currently, I can hardcode an Object [][] to do so like the following:
String[] columnNames = {"u", "v"};
Object[][] nodeData = new Object[][] {
{nodePoints.get(0).getU(), nodePoints.get(0).getV() },
{nodePoints.get(1).getU(), nodePoints.get(1).getV() }
};
JTable table = new JTable(nodeData, columnNames);
However, I would like to fill nodeData dynamically instead of hard coding like I did.
Based on #g00se's answer I came up with the following:
String[] columnNames = {"u", "v"};
DefaultTableModel tableModel = new DefaultTableModel(columnNames,0);
for (AbstractDrawablePoint node: nodePoints) {
Object [] currentNode = {node.getU(),node.getV()};
tableModel.addRow(currentNode);
}
JTable table = new JTable(tableModel);
Good afternoon guys, i'm trying to learn java programming and then i'm encountering some problem that i don't know why with my code when I'm learning about JTable.
So, what I'm trying to do is when i double clicked the row in JTable named TableGejala, the row that i double clicked will transfered into the other JTable named TableAturan and after that the row that i double clicked in TableGejala will be removed. For the part of transferring row from TableGejala to TableAturan successfully transferred when i double clicked the row, but it doesn't delete the correct row in TableGejala. Instead of deleting the row that i clicked, it delete the row below it.
For more details, this is my code to create TableGejala :
private void getTableGejala() {
while(tabel2.getRowCount() > 0){
for(int i=0;i < tabel2.getRowCount();i++){
tabel2.removeRow(i);
}
}
tabel2.addColumn("ID Gejala");
tabel2.addColumn("Nama Gejala");
TabelGejala.setModel(tabel2);
TabelGejala.setAutoResizeMode(TabelGejala.AUTO_RESIZE_ALL_COLUMNS);
}
And then this is my code to get data for my table from MySQL :
private void loadDataGejala(Boolean baru){
tabel2.getDataVector().removeAllElements();
try {
java.sql.Connection konek = (Connection) Koneksi.KoneksiDB.getConnection();
java.sql.Statement konek_statement = konek.createStatement();
String query_bukaTabel = "";
if(baru){
query_bukaTabel = "select id_gejala,nama_gejala from gejala";
}
else{
String idPkt = FieldID.getText();
query_bukaTabel = "select gejala.id_gejala,gejala.nama_gejala from gejala where gejala.id_gejala not in(select id_gejala from aturan2 where id_penyakit='"+idPkt+"')";
}
java.sql.ResultSet line_result = konek_statement.executeQuery(query_bukaTabel);
while (line_result.next()) {
Object[] getO = new Object[2];
getO[0] = line_result.getString("id_gejala");
getO[1] = line_result.getString("nama_gejala");
tabel2.addRow(getO);
}
line_result.close();
konek_statement.close();
}catch (Exception e) {}
}
This is my code to transfer the row and delete the row :
private void TabelGejalaMousePressed(java.awt.event.MouseEvent evt) {
if (evt.getClickCount()>=2){
int col = 0;
int row = 0;
row = TabelGejala.rowAtPoint(evt.getPoint());
col = TabelGejala.columnAtPoint(evt.getPoint());
String col1 = (String)TabelGejala.getValueAt(row, 0);
String col2 = (String)TabelGejala.getValueAt(row, 1);
DefaultTableModel model = (DefaultTableModel) TabelAturan.getModel();
DefaultTableModel old = (DefaultTableModel) TabelGejala.getModel();
old.removeRow(row);
model.addRow(new Object[]{col1, col2, 0});
TabelAturan.requestFocus();
TabelAturan.setRowSelectionInterval(TabelAturan.getRowCount()-1,TabelAturan.getRowCount()-1);
TabelAturan.editCellAt(TabelAturan.getRowCount()-1,2);
}
}
And this is the screenshot of my problem :
Before Double Clicked
After Double Clicked
Which part that makes my output get the wrong row to be deleted? please help me, and thank you in advance for any helps, even for reading my question :)
Firstly disable cell editable property in your first table(TabelGejala) to ensure proper deleting of row. I achieved this using the following code :-
//instance table model
DefaultTableModel tableModel = new DefaultTableModel(new Object[][]{},
new String[]{
"ID Gejala", "Nama Gejala"
}) {
#Override
public boolean isCellEditable(int row, int column) {
//all cells false
return false;
}
};
TabelGejala.setModel(tableModel);
then use jtable.getselectedrow() and jtable.getselectedcolumn() to get values from table. after addition of desired values to second table, simply delete the selected row. here is the code, derived from your code :-
private void TabelGejalaMousePressed(java.awt.event.MouseEvent evt) {
// TODO add your handling code here:
if (evt.getClickCount() >= 2) {
DefaultTableModel model = (DefaultTableModel) TabelAturan.getModel();
DefaultTableModel old = (DefaultTableModel) TabelGejala.getModel();
model.addRow(new Object[]{TabelGejala.getValueAt(TabelGejala.getSelectedRow(), 0), TabelGejala.getValueAt(TabelGejala.getSelectedRow(), 1), 0});
old.removeRow(TabelGejala.getSelectedRow());
TabelAturan.requestFocus();
TabelAturan.setRowSelectionInterval(TabelAturan.getRowCount() - 1, TabelAturan.getRowCount() - 1);
TabelAturan.editCellAt(TabelAturan.getRowCount() - 1, 2);
}
}
Adding the colums works, but i am stuck when i want to add the data of the columns stored in a mysql database to the jtable. it ask for a object vector[][] but i have no clue what to give
Connection con;
DefaultTableModel model = new DefaultTableModel();
public Hoofdscherm() {
initComponents();
uitvoerSpelers.setModel(model);
try {
con = DriverManager.getConnection("jdbc:mysql://localhost/fullhouse", "root", "hamchi50985");
// selecteer gegevens uit fullhouse.speler tabel
PreparedStatement stat = con.prepareStatement("SELECT * FROM fullhouse.speler");
// sla deze GEGEVENS op in een resultset
ResultSet resultaat = stat.executeQuery();
// haal alle kolomnamen op PUUR VOOR DE MODEL VAN JTABLE
ResultSetMetaData data = resultaat.getMetaData();
String[] colum = new String[15];
for (int i = 1; i < data.getColumnCount(); i++) {
colum[i] = data.getColumnName(i);
model.addColumn(colum[i]);
while (resultaat.next()) {
Object[] gegevens = new String[] {resultaat.getString(1)};
model.addRow(gegevens[0]);
}
}
} catch (SQLException ex) {
JOptionPane.showMessageDialog(null, ex);
}
}
I think you need something like this.
Note
1. Also add your columns separate to resultset data. Like I showed in my code below.
Vector<String> rowOne = new Vector<String>();
rowOne.addElement("R1C1");
rowOne.addElement("R1C2");
Vector<String> rowTwo = new Vector<String>();
rowTwo.addElement("R2C1");
rowTwo.addElement("R2C2");
Vector<String> cols = new Vector<String>();
Vector<Vector> vecRow = new Vector<Vector>();
vecRow.addElement(rowOne);
vecRow.addElement(rowTwo);
cols.addElement("Col1");
cols.addElement("Col2");
JTable table = new JTable(vecRow, cols);
Edit
For you convenience and requirement You can follow code structure below.
Vector<String> rows = new Vector<String>();
Vector<Vector> dBdata = new Vector<Vector>();
// Add Columns to table
for (int i = 1; i < data.getColumnCount(); i++) {
colum[i] = data.getColumnName(i);
model.addColumn(colum[i]);
}
while (resultaat.next()) {
// add column data to rows vector
// Make sure that all data type is in string because of generics
rows.add(resultaat.getString("columnName1"));
rows.add(resultaat.getString("columnName2"));
rows.add(resultaat.getString("columnName3"));
// add whole row vector to dBdata vector
dBdata.addElement(rows);
}
model.addRow(dBdata);
Vector implements a dynamic array. It is similar to ArrayList, but with two differences:
Vector is synchronized.
Vector contains many legacy methods that are not part of the collections framework.
Class Vector Javadoc
I hope this will help you.
The line model.addRow(gegevens[0]);is incorrect.
You should do something like this:
String[] colum = new String[15];
for (int i = 1; i < data.getColumnCount(); i++) {
colum[i] = data.getColumnName(i);
model.addColumn(colum[i]);
while (resultaat.next()) {
Object[] gegevens = new String[] {resultaat.getString(1)};
model.addRow(gegevens);
}
}
Also you need to check DefaultTableModel
According to the documentation of DefaultTableModel:
This is an implementation of TableModel that uses a Vector of Vectors
to store the cell value objects.
I'm trying to populate a table with data from a database however i am having some issues with it. Could someone provide me with an example? (so the table takes in an Object[][] parameter for the data). I have the following basic code to display a table ;
class table extends JFrame
{
JTable table;
public table()
{
setLayout(new FlowLayout());
String[] columnNames = {"test","test","test"};
Object[][] data= {{"test","test","test"},{"test","test","test"}};
table = new JTable(data,columnNames);
table.setPreferredScrollableViewportSize(new Dimension(500,100));
table.setFillsViewportHeight(true);
JScrollPane scrollPane = new JScrollPane(table);
add(scrollPane);
}
}
Two years ago, during my time in technical school, I wrote a little library help solve some of the problems proposed by the exercises, which included a a DatabaseTableModel.
The class extends from AbstractTableModel, which means you can set it as the your JTable's data source.
Here's the algorithm that constructs a model from a ResultSet:
public final void constructModel(ResultSet rs) throws SQLException {
ResultSetMetaData rsmd = rs.getMetaData();
rs.last();
rowCount = rs.getRow();
int columnCount = rsmd.getColumnCount();
// DatabaseColumn simply holds a name and a Class<?>.
columns = new DatabaseColumn[columnCount];
// This is the Object[][] array that you were talking about.
// It holds all the data from the ResultSet.
data = new Object[columnCount][rowCount];
for (int i = 0; i < columnCount; ++i) {
// Figure out the column name and type.
int j = i + 1;
String colName = rsmd.getColumnLabel(j);
Class<?> colClass = String.class;
try {
colClass = Class.forName(rsmd.getColumnClassName(j));
} catch (ClassNotFoundException ex) {
colClass = String.class;
}
columns[i] = new DatabaseColumn(colName, colClass);
// Get the data in the current column as an Object.
rs.beforeFirst();
for (int k = 0; rs.next(); ++k) {
data[i][k] = rs.getObject(j);
}
}
// Notify listeners about the changes so they can update themselves.
fireTableStructureChanged();
}
The class worked when I used it in school, but it isn't exactly production code. When I look at it today, I start to see problems.
One problem is that it is loading the entire contents of the ResultSet into memory. Could get ugly pretty quickly.
Also, the algorithm isn't exactly optimal. It loops around with the database cursor as if it was nothing; I suppose that it would be less costly for the database if it had retrieved all the objects in the current row first and assigned them to their appropriate columns before moving on to the next row.
Nevertheless, I think it is a good enough starting point.
I am trying to add values to a Jtable, the values are fetched from arrayList,
How do you do that
I tried making Object[][] data; and the populate it inside a loop, but it does not work, How do you fix this?
String[] columns = {"Field String","Field Double"," Field Double"};
Object[][] data;
Iterator<Node> itr = arrayList.iterator();
while (itr.hasNext()) {
Node el = itr.next();
double a = el.getval();
data[i][1] = el.getstring();
data[i][2] = a;
data[i][3] = a*4;
i++;
}
JFrame frame = new JFrame("Title ");
JTable tablE = new JTable(data, columnas);
JPanel panel = new JPanel();
panel.add(table);
frame.add(panel);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(500, 500);
frame.setVisible(true);
How do you populate "data" inside a while loop?
Use a DefaultTableModel and add rows of data using its addRow(Object[]) or addRow(Vector) method. Set this as your JTable's model. The API and the JTable tutorial can get you started.
For e.g.,
ArrayList arrayList = new ArrayList();
String[] columns = {"Field String","Field Double"," Field Double"};
DefaultTableModel model = new DefaultTableModel(columns, 0);
for (Object item : arrayList) {
Object[] row = new Object[3];
//... fill in row with info from item
model.addRow(row);
}
JTable table = new JTable(model);
This demonstrates doing it with a for loop, but a while loop would be similar.