Develop Reference

CheckBox in jTable?

I've added a checkbox to rows on my table, but unfortunately I'm unable to select/deselect them.
I'm using an own Table Model that I got on internet.
Table Model's code:
import java.util.ArrayList;
import javax.swing.table.AbstractTableModel;
/**************/
public class ModeloTabela extends AbstractTableModel {
private ArrayList linhas = null;
private String [] colunas = null;
public ModeloTabela(ArrayList lin, String[] col){
setLinhas(lin);
setColunas(col);
}
public ArrayList getLinhas(){
return linhas;
}
public void setLinhas(ArrayList dados){
linhas = dados;
}
public String[] getColunas(){
return colunas;
}
public void setColunas(String [] nomes){
colunas = nomes;
}
public int getColumnCount(){
return colunas.length;
}
public int getRowCount(){
return linhas.size();
}
public String getColumnCount (int numCol){
return colunas[numCol];
}
public Object getValueAt(int numLin, int numCol){
Object[] linha = (Object[])getLinhas().get(numLin);
return linha[numCol];
}
public Class getColumnClass(int c) {
return getValueAt(0, c).getClass();
}
public boolean isCellEditable(int row, int col) {
return true;
}
}
And this Method will fill the Table:
public void PreencheTabela(String sql, JTable jt1, JTextField j1){
c.conexao();
ArrayList dados = new ArrayList();
String [] Colunas = new String[] {"STATUS", "ID", "FABRICANTE", "FORNECEDOR", "NOME", "CATEGORIA", "DATA DO CADASTRO", " CODIGO DE BARRAS", "QUANTIDADE"};
c.executaSQL(sql);
try {
c.rs.first();
do{
dados.add(new Object[]{c.rs.getInt("prod_id"),c.rs.getString("prod_fabricante"),c.rs.getString("prod_fornecedor"),c.rs.getString("prod_nome"),
c.rs.getString("prod_categoria"),c.rs.getDate("prod_datacadastro"),c.rs.getString("prod_codbarras"), c.rs.getInt("est_quantidade")});
j1.setBorder(BorderFactory.createLineBorder(Color.black));
}while(c.rs.next());
} catch (SQLException ex) {
JOptionPane.showMessageDialog(null, "Erro!\n"+ex.getMessage());
}
ModeloTabela modelo = new ModeloTabela(dados, Colunas);
jt1.setModel(modelo);
}
Which code can I use? Also, where do I put this code??

but unfortunately I'm unable to select/deselect them.
You didn't implement the setValueAt(...) method in your TableModel so the value can never be updated in the model.
I'm using an own Table Model that I got on internet.
Why are you using a custom TableModel? You can use the DefaultTableModel. It implements the setValueAt(...) method correctly. It also has an addRow(..) method that allows you to dynamically update the model.
Are you actually storing Boolean objects in the TableModel? I don't see you using getBoolean() to get the data from your ResultSet. The default renderers/editors for a check box will only be used when you have Boolean data in the column.
Also take a look at: Can't create column with checkboxes in JTable for a better implementation of the getColumnClass() method.
If you insist on using your custom TableModel, then take a look at the Swing tutorial link you were given in your last question. It shows and example of implementing the setValueAt() method.

Display a JTable [duplicate]

This question already has an answer here:
Store products in a TreeSet and print the content in a JTable
(1 answer)
Closed 7 years ago.
I'm trying to display a single JTable, but I keep getting many new JTables everytime I insert a new product: http://i.stack.imgur.com/gyNsn.png
How can I display just one JTable and also make the column names visible?
Here is the method that creates the table:
public JTable populate(Product p) {
Vector<Vector<Object>> data = new Vector<Vector<Object>>();
Vector<Object> row = new Vector<Object>();
Vector<String> headers = new Vector<String>();
headers.add("Product name");
headers.add("Price");
headers.add("In stock");
row.add(p.getProductName());
row.add(p.getPrice());
row.add(p.getStock());
data.add(row);
productsTable = new JTable(data, headers);
return (new JTable(data, headers));
}
And here is a part from the GUI class:
addProductBtn.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
Product product = new Product(insertProductName.getText(), Integer.parseInt(insertPrice.getText()), Integer.parseInt(insertStock.getText()));
warehouse.addProduct(product); // by using a TreeSet
productsTable = warehouse.populate(product); // here I call the earlier defined method
warehouse.initFile(); // I wrote the productsTable content into a binary file, so that it can act like a database
warehouse.readFile();
warehouse.populate(product);
manageProductsPanel.add(productsTable);
});

The populate method you posted creates a new JTable every time it is called. Given this is called every time the ActionListener is called, a new JTable will be added. You should consider creating your own TableModel - extend AbstractTableModel and override the necessary methods, returning the appropriate values for each row/column. A simple example is below, making some assumptions about project structure for demo's sake (for instance warehouse is an instance of a List):
public class MyTableModel extends AbstractTableModel{
#Override
public int getColumnCount() {
return 3;
}
#Override
public int getRowCount() {
return warehouse.size();
}
#Override
public Object getValueAt(int arg0, int arg1) {
switch(arg1){
case 0:
return warehouse.get(arg0).getName();
case 1:
return warehouse.get(arg0).getPrice();
default:
return warehouse.get(arg0).isInStock();
}
}
#Override
public String getColumnName(int col){
switch(col){
case 0:
return "Name";
case 1:
return "Price";
default:
return "In STock";
}
}
}
You can then create an instance of this class, and set the table model for the JTable. Every time the backed List is updated, you can update the Listeners of the TableModel
MyTableModel tableModel = new MyTableModel();
myTable.setMOdel(tableModel);
.......
//when an item is added to
warehouse.add(item);
tableModel.fireTableDataChanged();
There are more demonstrations for how to customize a JTable in the Oracle Tutorials

Populating a JTable using ArrayList<String>

So I try to populate jtable using my arraylist, I also want to keep 3-layer architecture
My DAL
I read data from file and try to populate it into table
public class E {
public ArrayList<String> getinformationforthetable() {
Scanner s = null;
ArrayList<String> data = new ArrayList<String>();
try {
s = new Scanner(new File("songs.txt"));
while (s.hasNextLine()) {
String line = s.nextLine();
if (line.startsWith("")) {
String[] atoms = line.split("[#]");
ArrayList<String> row = new ArrayList<String>();
row.add(atoms[0]);
row.add(atoms[1]);
row.add(atoms[2]);
row.add(atoms[3]);
row.add(atoms[4]);
row.add(atoms[5]);
data.addAll(row);
}
}
}
catch(IOException e) {
e.printStackTrace();
}
finally {
if (s != null) {
s.close();
}
}
return data;
}
}
My UI
I want to populate table model with arraylist I had before but im not sure how to do it.
public class setTableModel extends AbstractTableModel{
private static final String[] COLUMN_HEADERS =
{
"Title", "Artist", "Gengre", "Quality", "Duration","Favorite"
};
private static final Class[] COLUMN_TYPES =
{
String.class, String.class,String.class,String.class, Integer.class, Boolean.class
};
#Override
public int getRowCount() {
return COLUMN_HEADERS.length;
}
#Override
public int getColumnCount() {
return null;
//todo
}
#Override
public Object getValueAt(int i, int i1) {
return null;
//todo
}
}

Don't use an ArrayList.
String[] atoms = line.split("[#]");
//ArrayList<String> row = new ArrayList<String>();
model.addRow( atoms );
You already have the data in an Array. You can use the addRow(...) method of the DefaultTableModel which will take the data in the array and add the data to the model for you.
So change your method signature. Instead of returning an ArrayList you should return a DefaultTableModel. Then you can use the model to create your JTable.

A problem I can see you facing is the structure of your ArrayList. It is only one dimensional. Data in a JTable/TableModel needs to be two dimensional rows/columns
If you made your getinformationforthetable() return an ArrayList<ArrayList<String>> then you would be able to more easily populate your table.
Also you might as well just extends DefaultTableModel. I don't see any special functionality added to your AbstractTableModel. Then you can just use the method addRow of DefaultTableModel to add rows. Something like this
DefaultTableModel model = new MyDefaultTableModel();
E e = new E();
ArrayList<ArrayList<String>> list = e.getinformationforthetable();
for (ArrayList<String> row : list) {
model.addRow(row.toArray());
}
table.setModel(model);
Or don't even extend DefaultTableModel at all. You can just override it's getColumnClass(), something like this
private static final String[] COLUMN_HEADERS =
{
"Title", "Artist", "Gengre", "Quality", "Duration","Favorite"
};
DefaultTableModel model = new DefaultTableModel(COLUMN_HEADERS, 0) {
#Override
public Class getColumnClass(int column) {
switch (column) {
case 0: return String.class; break;
case 1: return String.class; break;
...
}
}
};

In your example, you need your setTableModel (which you should rename to SetTableModel to be consistent with Java style) to maintain the data. Currently, you're keeping the data in E.
You can add a method to SetTableModel like addRow(String) and that method can do the split and keep the data within SetTableModel.
Then when you override getValueAt(int row, int column), you pull from the local data.
Also, getColumnCount() could return COLUMN_HEADERS.length and getRowCount() should return the number of rows maintained in the local data.

How I can use arraylist to store my data in predefined default table model for JTable

I want to add data to my own JTable model in runtime. I have the table and add button on my interface. As I understand I cant do it with two dimensional array and want to use Arraylist in my custom made table model but I dont know how to make the constructor if I use such type of data.
static String[] columnNames = {"A", "B", "C"};
static Object data[][] = new Object[15][3];
public MyTableModel() {
super(data, columnNames);
}
this is the constructor for data as two dimansional array but I want to use:
ArrayList<Object[]> data = new ArrayList<Object[]>();
How to make it

One way to do it, is to use AbstractTableModel. Here is an example:
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.SwingUtilities;
import javax.swing.table.AbstractTableModel;
public class TestTable {
public static class MyModel extends AbstractTableModel {
private List<Object[]> data;
private List<String> columnNames;
public MyModel(List<String> columnNames, List<Object[]> data) {
super();
this.columnNames = columnNames;
this.data = data;
}
#Override
public int getRowCount() {
return data.size();
}
#Override
public int getColumnCount() {
return columnNames.size();
}
#Override
public String getColumnName(int column) {
return columnNames.get(column);
}
#Override
public Object getValueAt(int rowIndex, int columnIndex) {
return data.get(rowIndex)[columnIndex];
}
}
protected void initUI() {
JFrame frame = new JFrame(TestTable.class.getSimpleName());
List<String> columns = Arrays.asList("Name", "Age");
List<Object[]> data = new ArrayList<Object[]>();
for (int i = 0; i < 50; i++) {
Object[] value = new Object[2];
value[0] = "Name-" + i;
value[1] = 12 + i;
data.add(value);
}
JTable table = new JTable(new MyModel(columns, data));
frame.add(new JScrollPane(table));
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
#Override
public void run() {
new TestTable().initUI();
}
});
}
}
If you need to to modify your data List<Object[]>, don't forget to fire appropriate Table Events. AbstractTableModel contains them all already.

It's a bit hard to tell what you're doing as you haven't included the full source code of your table model, so I'm going to make a few assumptions here.
You're probably either extending AbstractTableModel or DefaultTableModel. In either case, you shouldn't have to add your data to the model via the constructor. Instead, you will want to override the following methods in your TableModel extension:
getRowCount()
getColumnCount()
getValueAt(int row, int column)
Make it so that each of these methods indexes into your ArrayList<Object[]> data object - e.g., getValueAt(row,column) should return something like data.get(row)[column]. Then add your TableModel to a JTable and you should be good to go, as far as displaying the custom data goes.
Now... when your data changes (either you changed the value of a cell in the table or you added/removed rows), you just call fireTableDataChanged() on your TableModel (assuming it has extended AbstractTableModel or one of its subclasses). This will force the UI to update with the changes you made to the underlying data.

The most straightforward way to create your own table model is to inherit from AbstractTableModel. Then override, at a minimum, getRowCount, getColumnCount, and getValueAt.
You can then either create the table using "new JTable(mymodel)", where "mymodel" is an instance of the model you have created, or you could create it with just "new JTable", and then later do setModel to attach your model to the JTable.
For example -- and while I've done this a bazillion times, I'm writing this off the top of my head so no warranties expressed or implied, odds are there's a syntax error or two in there somewhere:
class ArrayListModel extends AbstractTableModel
{
ArrayList<Object[]> list;
public ArrayListModel(ArrayList<Object[]> list)
{
this.list=list;
}
public int getRowCount()
{
return list.size();
}
public int getColumnCount()
{
if (list.size()==0)
{
return 0;
}
else
{
return list.get(0).length;
}
}
public Object getValueat(int row, int column)
{
return list.get(row)[column];
}
}
... somewhere else ...
ArrayListModel mymodel=new ArrayListModel(somedata);
JTable mytable=new JTable(mymodel);
... etc ...
Side note: When I was first learning Java, I thought that the "normal" way to create a JTable was to use the default model, create a vector of vectors or a 2-D array and then populate. I thought creating your own model would be something you did in rare, odd cases. But I've since figured out that the default model is only the best way in rare, simple cases. Now I almost always create my own model: it's usually easier to code and easier to understand. Typically I have an ArrayList of some class that I've created with specific fields, and then in my model class I have something like:
public Object getValueAt(int row, int col)
{
Whatever w=list.get(row);
if (col==0) return w.foo;
else if (col==1) return w.bar;
else if (col==2) return w.plugh;
else throw SomeException();
}
Or use a case statement. Same idea.

Java JTable restructure / reload / refresh

I have a tree and a table on my panel, when I click the tree node, the table needs to change at the same time, but it doesn't. I search online and read the Java tutorial and didn't find any solutions. From some posts I think I need to use fireTableStruetureChanged(), but it just doesn't work in my code. Could anyone help me out of this? The following is the code. Thanks a ton!
public class tableStructureChange extends JFrame implements ... {
.....
/ //columnNames is a public variable, because I need to change the columns later
columnNames = new String[] {"col1","col2"}; */
data = new String[][]{
{"Mary", "Campione"},
{"Alison", "Huml"}, };
table = new JTable(new MyTableModel());
table.setAutoCreateColumnsFromModel( false );
feedback = new JScrollPane(table); //feedback is the bottom panel
...
}
//the following class is the problem, i need the table to be reloaded
//when the class is called, but the table doesn't change at all
public void displayFeedback(String tempString) {
//create table for bottom panel
columnNames = new String[] {"col3","col4", "col5"};
String[][] data = new String[][]{
{"Mary", "Campione", "us"},
{"Alison", "Huml", "canada"}, };
//table = new JTable(data, columnNames);
//fireTableStructureChanged(); //this is the problem part
}
// my table model
class MyTableModel extends AbstractTableModel {
String[] columnNames = new String[] {"col1","col2"};
public int getColumnCount() {
return columnNames.length;
}
public int getRowCount() {
return data.length;
}
public String getColumnName(int col) {
return columnNames[col];
}
public Object getValueAt(int row, int col) {
return data[row][col];
}
}
...
}

In your method displayFeedback you seem to be hoping to replace the JTable object and have the display change to reflect what is selected in the JTree above. Instead of replacing what is in the View object, you should focus your effort on updating the Model, in this case, the AbstractTableModel subclass that you have created. There are a couple ways you can do that, but for a brute force proof of concept, you could do something like the following:
add a constructor to MyTableModel that takes a 2 dimensional array of data
in displayFeedback, create a new instance of MyTableModel that has new data relevant to the tree node that was selected.
call setModel on your global table variable.