Java: Automatically Update a Checkbox in JTable when Another Checkbox is Clicked

Java: Automatically Update a Checkbox in JTable when Another Checkbox is Clicked - java

I want every checkbox in the JTable in the EventYearMatchingUnitPanel class to be selected automatically when a checkbox in the JTable in EventYearMatchingWindow is clicked.
clicking the "unit 9" checkbox in the first picture (https://ibb.co/fsqtrQ) should automatically select all 5 checkboxes in the second picture (https://ibb.co/f8ja5k)
I used the tableChanged() method in TabelModelListener to detect if a checkbox is clicked. When I click the checkbox, it changes the value of the other checkboxes (from Boolean.FALSE to Boolean.TRUE), but the checkboxes don't update (don't physically show the checkmarks).
//for the first JTable
public void tableChanged(TableModelEvent e){
int row = e.getFirstRow();
int column = e.getColumn();
TableModel model = (TableModel)e.getSource();
String columnName = model.getColumnName(column);
Object thatValue = model.getValueAt(row, column);
data[row][column] = thatValue;
for(int i = 0; i < unitPanels[row].getNumRows(); i++){
unitPanels[row].setToSelectedState(i);
}
}
//for the second JTable
public void setToSelectedState(int row){
data[row][0] = Boolean.TRUE;
model.fireTableCellUpdated(row, 0);
}
Here's a bigger picture of the code:
public class EventYearMatchingWindow extends JFrame implements
TableModelListener
{
private boolean columnHeaderClicked;
private ArrayList<Category> categories;
private JPanel mainPanel, listPanel, buttonPanel;
private ArrayList<Item> selectedItems;
private EventYearMatchingItemChoosing[] unitPanels;
Object data[][];
public EventYearMatchingWindow(ArrayList<Category> c){
...
String[] columnNames = {"Include?", ""};
data = new Object[6][2];
for(int i = 0; i < 6; i++){
data[i][0] = Boolean.FALSE;
data[i][1] = "Unit " + (i+8);
}
DefaultTableModel model = new DefaultTableModel(data, columnNames) {
private static final long serialVersionUID = 1L;
#Override
public Class getColumnClass(int columnIndex) {
if (columnIndex == 0){
return Boolean.class;
}
return super.getColumnClass(columnIndex);
}
};
JTable table = new JTable(model);
table.getModel().addTableModelListener(this);
table.addMouseListener(new java.awt.event.MouseAdapter() {
....
#Override
public void mouseClicked(java.awt.event.MouseEvent evt) {
int row = table.rowAtPoint(evt.getPoint());
int col = table.columnAtPoint(evt.getPoint());
if (row == -1 && col >= 0){
columnHeaderClicked = true;
}
if (row >= 0 && col == 1 && !columnHeaderClicked) {
mainPanel.removeAll();
System.out.println(unitPanels[row].getData()[0][0]);
unitPanels[row].revalidate();
unitPanels[row].repaint();
mainPanel.add(unitPanels[row]);
JPanel nButtonPanel = new JPanel();
Button back = new Button("Back");
nButtonPanel.add(back);
back.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
mainPanel.removeAll();
mainPanel.add(listPanel);
mainPanel.add(buttonPanel);
mainPanel.revalidate();
repaint();
}
});
mainPanel.add(nButtonPanel);
mainPanel.revalidate();
repaint();
}
}
});
}
public void tableChanged(TableModelEvent e){
int row = e.getFirstRow();
int column = e.getColumn();
TableModel model = (TableModel)e.getSource();
String columnName = model.getColumnName(column);
Object thatValue = model.getValueAt(row, column);
data[row][column] = thatValue;
for(int i = 0; i < unitPanels[row].getNumRows(); i++){
unitPanels[row].setToSelectedState(i);
}
}
}
And:
public class EventYearMatchingItemChoosing extends JPanel implements TableModelListener
{
Category category;
private boolean columnHeaderClicked;
private int size;
private ArrayList<Item> items;
private Object[][] data;
DefaultTableModel model;
public EventYearMatchingItemChoosing(String s, ArrayList<Category> c){
...
String[] columnNames = {"Include?", "Event", "Year"};
data = new Object[size][3]
for(int i = 0; i < category.getItems().size(); i++){
if(!category.getItems().get(i).getEvent().equals("") && !category.getItems().get(i).getYear().equals("")){
data[i][0] = Boolean.FALSE;
data[i][1] = category.getItems().get(i).getEvent();
data[i][2] = category.getItems().get(i).getYear();
}
}
model = new DefaultTableModel(data, columnNames) {
private static final long serialVersionUID = 1L;
#Override
public Class getColumnClass(int columnIndex) {
if (columnIndex == 0){
return Boolean.class;
}
return super.getColumnClass(columnIndex);
}
};
JTable table = new JTable(model);
table.getModel().addTableModelListener(this);
...
}
...
public void tableChanged(TableModelEvent e){
int row = e.getFirstRow();
int column = e.getColumn();
TableModel model = (TableModel)e.getSource();
String columnName = model.getColumnName(column);
Object thatValue = model.getValueAt(row, column);
data[row][column] = thatValue;
}
public void setToSelectedState(int row){
data[row][0] = Boolean.TRUE;
model.fireTableCellUpdated(row, 0);
}
}

but the checkboxes don't update (don't physically show the checkmarks).
data[row][0] = Boolean.TRUE;
Don't ever access the data Array. The data Array is used to create the DefaultTableModel and then the data is copied from the Array to the data structure used by the DefaultTableModel (which happens to be a Vector of Vectors).
The end result is that the data in the TableModel is never changed.
The code should be:
model.setValueAt(Boolean.TRUE, row, 0);

Related

How can i add checkbox on my JTable?

This is a Drag and Drop Java Swing
Here's my code
prod.removeColumn(prod.getColumnModel().getColumn(0));
String sql = "select prod_id,prod_description,prod_wh_name,prod_fr_name from product order by prod_description asc";
PreparedStatement pst = con.prepareStatement(sql);
ResultSet rs = pst.executeQuery();
while(rs.next())
{
int columns = rs.getMetaData().getColumnCount();
Object[] row = new Object[columns];
for(int i = 1 ; i <=columns;i++)
{
row[i - 1] = rs.getObject(i);
}
((DefaultTableModel) prod.getModel()).insertRow(rs.getRow() -1,row);
}
I want to add a checkbox on the left side of every data in jtable(Prod Description), Any solution for that? and can select more than one? and how can i get the data of the selected item? Thanks in advance!

One way is to create a "wrapper" TableModel.
In this example a column containing check marks will be added to the left of the columns in any existing TableModel:
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
import javax.swing.table.*;
public class CheckBoxWrapperTableModel extends AbstractTableModel
{
private ArrayList<Boolean> checkBoxes = new ArrayList<>();
private DefaultTableModel model;
private String columnName;
public CheckBoxWrapperTableModel(DefaultTableModel model, String columnName)
{
this.model = model;
this.columnName = columnName;
for (int i = 0; i < model.getRowCount(); i++)
checkBoxes.add( Boolean.FALSE );
}
#Override
public String getColumnName(int column)
{
return (column > 0) ? model.getColumnName(column - 1) : columnName;
}
#Override
public int getRowCount()
{
return model.getRowCount();
}
#Override
public int getColumnCount()
{
return model.getColumnCount() + 1;
}
#Override
public Object getValueAt(int row, int column)
{
if (column > 0)
return model.getValueAt(row, column - 1);
else
{
Object value = checkBoxes.get(row);
return (value == null) ? Boolean.FALSE : value;
}
}
#Override
public boolean isCellEditable(int row, int column)
{
if (column > 0)
return model.isCellEditable(row, column - 1);
else
return true;
}
#Override
public void setValueAt(Object value, int row, int column)
{
if (column > 0)
model.setValueAt(value, row, column - 1);
else
{
checkBoxes.set(row, (Boolean)value);
}
fireTableCellUpdated(row, column);
}
#Override
public Class getColumnClass(int column)
{
return (column > 0) ? model.getColumnClass(column - 1) : Boolean.class;
}
public void removeRow(int row)
{
checkBoxes.remove(row);
fireTableRowsDeleted(row, row);
model.removeRow(row);
}
private static void createAndShowGUI()
{
// Create the table with check marks in the first column
DefaultTableModel model = new DefaultTableModel(5, 1);
for (int i = 0; i < model.getRowCount(); i++)
{
model.setValueAt("" + i, i, 0);
}
CheckBoxWrapperTableModel wrapperModel = new CheckBoxWrapperTableModel(model, "Select");
JTable table = new JTable(wrapperModel);
// Add button to delete selected rows
JButton button = new JButton( "Delete Selected Rows" );
button.addActionListener( new ActionListener()
{
#Override
public void actionPerformed(ActionEvent e)
{
for (int i = table.getRowCount() - 1; i >= 0; i--)
{
Boolean selected = (Boolean)table.getValueAt(i, 0);
System.out.println(selected + " : " + i);
if (selected)
{
wrapperModel.removeRow(i);
}
}
}
});
JFrame frame = new JFrame("SSCCE");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add( new JScrollPane( table ) );
frame.add( button, BorderLayout.PAGE_END );
frame.pack();
frame.setLocationByPlatform( true );
frame.setVisible( true );
}
public static void main(String[] args)
{
EventQueue.invokeLater( () -> createAndShowGUI() );
/*
EventQueue.invokeLater(new Runnable()
{
public void run()
{
createAndShowGUI();
}
});
*/
}
}
This allows you to add the check box even if you don't have access to the original TableModel when it is created to add your own column of check boxes.

change jtable row selection based on multiple keypresses

I have a JTable with actually 6 columns and many rows. Now i want to change the selection and jump to that row by pressing one or more keys on the keyboard.
This is the example of what i want:
If I press "S" on keyboard my application should select the first row in my table which has an entry beginning with the char "S".
However if I press two keys "SC" it should do the same with rows beginning with "SC" like above.
When I press another keys, for example "BHM", it should do the same with the rows beginning with "BHM" like above.
I have implemented this but it is not working properly
P.S The GUI also freezes after too many key presses.
Here is my complete code.
MyTable.java
public class MyTable extends JPanel {
public JScrollPane jScrollPane1;
public JTextField searchField;
public JTable table;
Object[] data = new Object[6];
ArrayList rows = new ArrayList();
MyTable() {
table = new JTable();
table.setAutoCreateRowSorter(true);
table.setModel(new DefaultTableModel(
new Object[][]{},
new String[]{
"Description", "Code", "Qty", "Cost", "Rate", "Packing"
}
) {
Class[] types = new Class[]{
String.class, String.class, Integer.class, Double.class, Double.class, String.class
};
boolean[] canEdit = new boolean[]{
false, false, false, false, false, false
};
public Class getColumnClass(int columnIndex) {
return types[columnIndex];
}
public boolean isCellEditable(int rowIndex, int columnIndex) {
return canEdit[columnIndex];
}
});
table.setColumnSelectionAllowed(true);
table.setCursor(new java.awt.Cursor(java.awt.Cursor.DEFAULT_CURSOR));
table.getTableHeader().setReorderingAllowed(false);
table.getColumnModel().getSelectionModel().setSelectionMode(javax.swing.ListSelectionModel.SINGLE_SELECTION);
if (table.getColumnModel().getColumnCount() > 0) {
table.getColumnModel().getColumn(0).setMinWidth(300);
table.getColumnModel().getColumn(0).setPreferredWidth(300);
table.getColumnModel().getColumn(0).setMaxWidth(1000);
table.getColumnModel().getColumn(1).setMinWidth(100);
table.getColumnModel().getColumn(1).setPreferredWidth(100);
table.getColumnModel().getColumn(1).setMaxWidth(500);
table.getColumnModel().getColumn(2).setMinWidth(50);
table.getColumnModel().getColumn(2).setPreferredWidth(50);
table.getColumnModel().getColumn(2).setMaxWidth(100);
table.getColumnModel().getColumn(3).setMinWidth(80);
table.getColumnModel().getColumn(3).setPreferredWidth(80);
table.getColumnModel().getColumn(3).setMaxWidth(200);
table.getColumnModel().getColumn(4).setMinWidth(80);
table.getColumnModel().getColumn(4).setPreferredWidth(80);
table.getColumnModel().getColumn(4).setMaxWidth(200);
table.getColumnModel().getColumn(5).setMinWidth(80);
table.getColumnModel().getColumn(5).setPreferredWidth(80);
table.getColumnModel().getColumn(5).setMaxWidth(200);
}
table.setPreferredScrollableViewportSize(new Dimension(800, 600));
table.setFillsViewportHeight(true);
table.setRowHeight(30);
JScrollPane scrollPane = new JScrollPane(table);
add(scrollPane);
table.addKeyListener(new SearchingKeyAdapter(table));
addRowData();
table.changeSelection(0, 0, false, false);
}
private static void createAndShowGUI() {
//Create and set up the window.
JFrame frame = new JFrame("MyTable");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Create and set up the content pane.
MyTable newContentPane = new MyTable();
newContentPane.setOpaque(true);
frame.setContentPane(newContentPane);
//Display the window.
frame.pack();
frame.setVisible(true);
}
private void addRowData() {
String desc = "SL 123";
Integer code = 12345;
Integer qty = 10;
Double rate = new Double(1000);
Double cost = new Double(900);
String pack = "10x10x10";
data[0] = desc;
data[1] = code;
data[2] = qty;
data[3] = cost;
data[4] = rate;
data[5] = pack;
DefaultTableModel model = (DefaultTableModel) table.getModel();
for (int i = 0; i < 5; i++) {
data[0] = "SL " + i;
rows.add(data);
model.addRow(data);
}
rows.clear();
for (int i = 0; i < 5; i++) {
data[0] = "SC " + i;
rows.add(data);
model.addRow(data);
}
data[0] = "AP";
model.addRow(data);
data[0] = "GP";
model.addRow(data);
data[0] = "PS";
model.addRow(data);
data[0] = "PP";
model.addRow(data);
data[0] = "BHM";
model.addRow(data);
data[0] = "BGP";
model.addRow(data);
}
public static void main(String[] args) {
//Schedule a job for the event-dispatching thread:
//creating and showing this application's GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}
SearchingKeyAdapter.java
public class SearchingKeyAdapter extends KeyAdapter {
String key = "";
private final JTable table;
private int selectedRow = -1;//before start
public SearchingKeyAdapter(JTable table) {
this.table = table;
}
#Override
public void keyPressed(KeyEvent e) {
key += String.valueOf(e.getKeyChar());
}
#Override
public void keyReleased(KeyEvent e) {
String keyChar = key.toUpperCase();
key = "";
TableModel model = table.getModel();
int startRow = selectedRow;
if (selectedRow == model.getRowCount() - 1) {
startRow = -1;//Go before start
}
int col = 0;
for (int row = startRow + 1; row < model.getRowCount(); row++) {
String value = (String) model.getValueAt(row, col);
if (value != null && !value.isEmpty() && value.toUpperCase().startsWith(keyChar)) {
table.getSelectionModel().clearSelection();
table.getColumnModel().getSelectionModel().clearSelection();
table.setRowSelectionInterval(row, row);
table.changeSelection(row, col, false, false);
selectedRow = row;
return;
}
}
}
}
Thank you !

I have implemented this but it is not working properly
Your example does not seem to assume that the selected row is changed by arrow keys or mouse click.
It might be easier to modify a similar function in JList than to create your own KeyListener.
JList#getNextMatch(...): Returns the next list element whose toString value starts with the given prefix.
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
import javax.swing.table.*;
import javax.swing.text.Position;
public class MyTable2 extends JPanel {
public JScrollPane jScrollPane1;
public JTextField searchField;
public JTable table;
private final Object[] data = new Object[6];
private final ArrayList<Object[]> rows = new ArrayList<>();
private MyTable2() {
table = new JTable();
table.setAutoCreateRowSorter(true);
table.setModel(new DefaultTableModel(
new String[] {
"Description", "Code", "Qty", "Cost", "Rate", "Packing"
}, 0
) {
Class[] types = new Class[] {
String.class, String.class, Integer.class, Double.class, Double.class, String.class
};
#Override public Class getColumnClass(int columnIndex) {
return types[columnIndex];
}
#Override public boolean isCellEditable(int rowIndex, int columnIndex) {
return false;
}
});
table.setColumnSelectionAllowed(true);
table.setCursor(new java.awt.Cursor(java.awt.Cursor.DEFAULT_CURSOR));
table.getTableHeader().setReorderingAllowed(false);
table.getColumnModel().getSelectionModel().setSelectionMode(
ListSelectionModel.SINGLE_SELECTION);
table.setPreferredScrollableViewportSize(new Dimension(800, 600));
table.setFillsViewportHeight(true);
table.setRowHeight(30);
//table.addKeyListener(new SearchingKeyAdapter(table));
table.addKeyListener(new TableNextMatchKeyHandler());
JScrollPane scrollPane = new JScrollPane(table);
add(scrollPane);
addRowData();
table.changeSelection(0, 0, false, false);
}
private static void createAndShowGUI() {
JFrame frame = new JFrame("MyTable");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new MyTable2());
frame.pack();
frame.setVisible(true);
}
private void addRowData() {
String desc = "SL 123";
Integer code = 12345;
Integer qty = 10;
Double rate = new Double(1000);
Double cost = new Double(900);
String pack = "10x10x10";
data[0] = desc;
data[1] = code;
data[2] = qty;
data[3] = cost;
data[4] = rate;
data[5] = pack;
DefaultTableModel model = (DefaultTableModel) table.getModel();
for (int i = 0; i < 5; i++) {
data[0] = "SL " + i;
rows.add(data);
model.addRow(data);
}
rows.clear();
for (int i = 0; i < 5; i++) {
data[0] = "SC " + i;
rows.add(data);
model.addRow(data);
}
data[0] = "AP";
model.addRow(data);
data[0] = "GP";
model.addRow(data);
data[0] = "PS";
model.addRow(data);
data[0] = "PP";
model.addRow(data);
data[0] = "BHM";
model.addRow(data);
data[0] = "BGP";
model.addRow(data);
}
public static void main(String[] args) {
//Schedule a job for the event-dispatching thread:
//creating and showing this application's GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}
//#see javax/swing/plaf/basic/BasicListUI.Handler
//#see javax/swing/plaf/basic/BasicTreeUI.Handler
class TableNextMatchKeyHandler extends KeyAdapter {
private static final int TARGET_COLUMN = 0;
private static final long TIME_FACTOR = 500L;
private String prefix = "";
private String typedString;
private long lastTime;
private boolean isNavigationKey(KeyEvent event) {
JTable table = (JTable) event.getComponent();
InputMap im = table.getInputMap(JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT);
KeyStroke key = KeyStroke.getKeyStrokeForEvent(event);
return Objects.nonNull(im) && Objects.nonNull(im.get(key));
}
#Override public void keyPressed(KeyEvent e) {
if (isNavigationKey(e)) {
prefix = "";
typedString = "";
lastTime = 0L;
}
}
#Override public void keyTyped(KeyEvent e) {
JTable src = (JTable) e.getComponent();
int max = src.getRowCount();
if (max == 0 || e.isAltDown() || isNavigationKey(e)) {
//|| BasicGraphicsUtils.isMenuShortcutKeyDown(e)) {
// Nothing to select
return;
}
boolean startingFromSelection = true;
char c = e.getKeyChar();
int increment = e.isShiftDown() ? -1 : 1;
long time = e.getWhen();
int startIndex = src.getSelectedRow();
if (time - lastTime < TIME_FACTOR) {
typedString += c;
if (prefix.length() == 1 && c == prefix.charAt(0)) {
// Subsequent same key presses move the keyboard focus to the next
// object that starts with the same letter.
startIndex += increment;
} else {
prefix = typedString;
}
} else {
startIndex += increment;
typedString = String.valueOf(c);
prefix = typedString;
}
lastTime = time;
selectAndScrollNextMatch(src, max, e, prefix, startIndex, startingFromSelection);
}
private static void selectAndScrollNextMatch(
JTable src, int max, KeyEvent e, String prefix,
int startIndex, boolean startingFromSelection) {
int start = startIndex;
boolean isStartingSelection = startingFromSelection;
if (start < 0 || start >= max) {
if (e.isShiftDown()) {
start = max - 1;
} else {
isStartingSelection = false;
start = 0;
}
}
Position.Bias bias = e.isShiftDown() ? Position.Bias.Backward : Position.Bias.Forward;
int index = getNextMatch(src, prefix, start, bias);
if (index >= 0) {
src.getSelectionModel().setSelectionInterval(index, index);
src.scrollRectToVisible(src.getCellRect(index, TARGET_COLUMN, true));
} else if (isStartingSelection) { // wrap
index = getNextMatch(src, prefix, 0, bias);
if (index >= 0) {
src.getSelectionModel().setSelectionInterval(index, index);
src.scrollRectToVisible(src.getCellRect(index, TARGET_COLUMN, true));
}
}
}
//#see javax/swing/JList#getNextMatch(String prefix, int startIndex, Position.Bias bias)
//#see javax/swing/JTree#getNextMatch(String prefix, int startIndex, Position.Bias bias)
public static int getNextMatch(
JTable table, String prefix, int startingRow, Position.Bias bias) {
int max = table.getRowCount();
if (Objects.isNull(prefix) || startingRow < 0 || startingRow >= max) {
throw new IllegalArgumentException();
}
String uprefix = prefix.toUpperCase(Locale.ENGLISH);
// start search from the next/previous element froom the
// selected element
int increment = bias == Position.Bias.Forward ? 1 : -1;
int row = startingRow;
do {
Object value = table.getValueAt(row, TARGET_COLUMN);
String text = Objects.toString(value, "");
if (text.toUpperCase(Locale.ENGLISH).startsWith(uprefix)) {
return row;
}
row = (row + increment + max) % max;
} while (row != startingRow);
return -1;
}
}

Edit Jtable on double click

I need to edit table when user double clicks on row, with new values. I tried with setValuesAt method but it didn't do anything.
This is what I got so far but I don't know how to set new values to Jtable.
public class Table extends JFrame {
private JTable table;
private JScrollPane jsPane;
private DefaultTableModel model;
private JPanel dialogPanel;
private JTextField tf[];
private JLabel lbl[];
private JPanel panel;
Object[] columns = new Object[]{"Name", "Last Name", "ID", "Email"};
Object[][] inData ;
public void prepareAndShowGUI() {
setTitle("Overview");
model = new DefaultTableModel() {
#Override
public boolean isCellEditable(int row, int column) {
return false;
}
};
model.setColumnIdentifiers(columns);
table = new JTable(model);
for (int i = 1; i <= 10; i++) {
model.addRow(new Object[]{"a", "s", "w", "e"});
}
jsPane = new JScrollPane(table);
table.addMouseListener(new MouseAdapter() {
#Override
public void mouseClicked(MouseEvent e) {
if (e.getClickCount() == 2) {
int x = e.getX();
int y = e.getY();
int row = table.rowAtPoint(new Point(x, y));
int col = table.columnAtPoint(new Point(x, y));
String array[] = new String[table.getColumnCount()];
for (int i = 0; i < array.length; i++) {
array[i] = (String) table.getValueAt(row, i);
}
populateTextField(array);
JOptionPane.showMessageDialog(null, dialogPanel, "Information", JOptionPane.INFORMATION_MESSAGE);
String[] values = new String[tf.length];
for (int i = 0; i < tf.length; i++) {
values[i] = tf[i].getText();
}
model.setValueAt(values, row, row);
}
}
});
panel = new JPanel(new BorderLayout());
JPanel panel1 = new JPanel();
panel1.setLayout(new BoxLayout(panel1, BoxLayout.X_AXIS));
panel.add(panel1, BorderLayout.NORTH);
panel.add(jsPane, BorderLayout.CENTER);
getContentPane().add(panel);
pack();
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLocationRelativeTo(null);
prepareDialogPanel();
setVisible(true);
}
private void prepareDialogPanel() {
dialogPanel = new JPanel();
int col = table.getColumnCount();
dialogPanel.setLayout(new GridLayout(col, 1));
tf = new JTextField[col];
lbl = new JLabel[col];
for (int i = 0; i < col; i++) {
lbl[i] = new JLabel(table.getColumnName(i));
tf[i] = new JTextField(10);
dialogPanel.add(lbl[i]);
dialogPanel.add(tf[i]);
}
}
private void populateTextField(String[] s) {
for (int i = 0; i < s.length; i++) {
tf[i].setText(s[i]);
}
}
}
public static void main(String st[])
{
SwingUtilities.invokeLater( new Runnable()
{
#Override
public void run()
{
Table td = new Table();
td.prepareAndShowGUI();
}
});
}

For starters, you should make your model editable, so change this line:
model = new DefaultTableModel() {
#Override
public boolean isCellEditable(int row, int column) {
return false;
}
};
To:
model = new DefaultTableModel() {
#Override
public boolean isCellEditable(int row, int column) {
return true; //use the row and col to determine which
//cells are editable. If you want all, have this return true.
}
};
This will invoke the JTable's DefaultCellEditor, which will then call on the model's setValueAt method, when the user has made the change on the edit.
All of these components can be replaced with custom components to perform different actions.
Here's the official Oracle documentation on JTables:
https://docs.oracle.com/javase/tutorial/uiswing/components/table.html
If you're trying to get your dialog to work, the problem is in these line:
String[] values = new String[tf.length];
for (int i = 0; i < tf.length; i++) {
values[i] = tf[i].getText();
}
model.setValueAt(values, row, row);
Basically the setValueAt only works on a cell by cell basis. You can't update a whole row like this. Instead try:
for(int i=0;i<tf.length;i++)
{
model.setValueAt(tf[i].getText(), row, i);
}

Jtable update selected row

I have a jtable that has a edit button, when i select a row and clicked to edit button and edit fields, and click to save button, that row doesn't update, And i have to refresh my table to Change that row!
My code:
if (e.getSource() == editButton) {
selectedRow = uTable.getSelectedRow();
if (selectedRow >= 0) {
editUser(selectedRow);
} else {
JOptionPane.showMessageDialog(null, "Select a row");
}
}
public void editUser(int row) {
UserInformation userInf = userModel.getSelectedMember(row);
NewUserFrame_Edit edit = new NewUserFrame_Edit(userInf, row);
}
...
My NewUserFrame_Edit Class :
public class NewUserFrame_Edit extends javax.swing.JFrame {
private AllUser userModel;
private int selectedrow;
private String gender;
public NewUserFrame_Edit(AllUser userModel,UserInformation userinf, int row) {
...
this.userModel = userModel;
jTextField1.setText(userinf.getFname().toString().trim());
jTextField2.setText(userinf.getLname().toString().trim());
if (userinf.getGender().equals("Male")) {
jRadioButton1.setSelected(true);
} else {
jRadioButton2.setSelected(true);
}
jTextField3.setText(userinf.getDate());
selectedrow = row;
setVisible(true);
}
private void updateButtonActionPerformed(java.awt.event.ActionEvent evt) {
userinf = new UserInformation();
userinf.setFname(jTextField1.getText());
userinf.setLname(jTextField2.getText());
userinf.setGender(gender);
userinf.setDate(jTextField3.getText());
userModel.setValueAt(userinf.getFname() , selectedrow, 1);
userModel.setValueAt(userinf.getLname() , selectedrow, 2);
userModel.setValueAt(userinf.getGender(), selectedrow , 3);
userModel.setValueAt(userinf.getDate() , selectedrow, 4);
userModel.updateFile(userModel.Udata);
NewUserFrame_Edit.this.dispose();
}
...
}
My setValueAt() and updateFile() methods of my model Class:
public class AllUser extends AbstractTableModel {
...
#Override
public void setValueAt(Object value, int rowIndex, int columnIndex) {
UserInformation userInfo = Udata.get(rowIndex);
switch (columnIndex) {
case 0:
userInfo.setID((String) value);
break;
case 1:
userInfo.setFname((String) value);
break;
case 2:
userInfo.setLname((String) value);
break;
case 3:
userInfo.setGender((String) value);
break;
case 4:
userInfo.setDate((String) value);
break;
}
fireTableCellUpdated(rowIndex, columnIndex);
}
public void updateFile(ArrayList<UserInformation> data) {
PrintWriter pw;
try {
pw = new PrintWriter(new FileWriter("AllUserRecords.txt"));
for (UserInformation userinf : data) {
String line = userinf.getID()
+ " " + userinf.getFname()
+ " " + userinf.getLname()
+ " " + userinf.getGender()
+ " " + userinf.getDate();
pw.println(line);
}
pw.close();
} catch (IOException ioe) {
}
}
...
}
When i select a row and click to edit button, a new jframe is open that its text field is fill with older data, and i update data and click to save button.
Thus, my column is not certain.
I select a entire row, Not a cell!
Thanks.

For changing JTable entries, use TableModel#setValueAt. Calling fireTableDataChanged is unnecessary. This is for use internally within TableModel itself.
if (selectedRow >= 0) {
...
userModel.setValueAt(newValue, selectedRow, 0);
// ... more values for columns 1, 2, 3, etc.
} ...

You can create a method called updateRow(int index,String[] values) within your AbstractModel extending class and within it set new Value for each cell for that row using setValueAt(newValue,row,index). And within overridden setValue method of TableModel write fireTableCellUpdated(row, col).
Consider the Code Given below. Look at the updateRow and setValueAt method in MyModel class. And watch ((MyModel)myModel).updateRow(row,values);//update row written in MyMouseAdapter class.
import javax.swing.*;
import javax.swing.border.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.table.*;
class TableRowEdit extends JFrame
{
private JTable table;
private JScrollPane jsPane;
private TableModel myModel;
private JPanel dialogPanel;
private JTextField tf[];
private JLabel lbl[];
public void prepareAndShowGUI()
{
myModel = new MyModel();
table = new JTable(myModel);
jsPane = new JScrollPane(table);
table.getColumnModel().getColumn(2).setCellRenderer(new LabelCellRenderer());
table.addMouseListener(new MyMouseAdapter());
getContentPane().add(jsPane);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
prepareDialogPanel();
pack();
setVisible(true);
}
private void prepareDialogPanel()
{
dialogPanel = new JPanel();
int col = table.getColumnCount() - 1;
dialogPanel.setLayout(new GridLayout(col,2));
tf = new JTextField[col];
lbl = new JLabel[col];
for (int i = 0; i < col; i++)
{
lbl[i] = new JLabel(table.getColumnName(i));
tf[i] = new JTextField(10);
dialogPanel.add(lbl[i]);
dialogPanel.add(tf[i]);
}
}
private void populateTextField(String[] s)
{
for (int i = 0 ; i < s.length ; i++ )
{
tf[i].setText(s[i]);
}
}
public class LabelCellRenderer extends DefaultTableCellRenderer
{
public Component getTableCellRendererComponent(JTable table,Object oValue, boolean isSelected, boolean hasFocus, int row, int column)
{
Component c = super.getTableCellRendererComponent(table, oValue,isSelected, hasFocus,row, column);
String value = (String)oValue;
JLabel label =(JLabel)c;
label.setBorder(BorderFactory.createBevelBorder(BevelBorder.RAISED));
label.setBackground(Color.lightGray);
label.setHorizontalTextPosition(SwingUtilities.CENTER);
label.setHorizontalAlignment(SwingUtilities.CENTER);
label.setText(value);
return label;
}
}
private class MyMouseAdapter extends MouseAdapter
{
#Override
public void mousePressed(MouseEvent evt)
{
int x = evt.getX();
int y = evt.getY();
int row = table.rowAtPoint(new Point(x,y));
int col = table.columnAtPoint(new Point(x,y));
if (col == 2)
{
String arr[] = new String[table.getColumnCount() - 1];
for (int i = 0 ; i < arr.length ; i++)
{
arr[i] = (String)table.getValueAt(row,i);
}
populateTextField(arr);
JOptionPane.showMessageDialog(TableRowEdit.this,dialogPanel,"Information",JOptionPane.INFORMATION_MESSAGE);
String[] values = new String[tf.length];
for (int i = 0 ; i < tf.length ; i++)
{
values[i] = tf[i].getText();
}
((MyModel)myModel).updateRow(row,values);//update row
}
}
}
private class MyModel extends AbstractTableModel
{
String[] columns = {
"Roll No.",
"Name",
"Action"
};
String[][] inData = {
{"1","Anthony Hopkins","Edit"},
{"2","James William","Edit"},
{"3","Mc. Donald","Edit"}
};
#Override
public void setValueAt(Object value, int row, int col)
{
inData[row][col] = (String)value;
fireTableCellUpdated(row,col);
}
#Override
public Object getValueAt(int row, int col)
{
return inData[row][col];
}
#Override
public int getColumnCount()
{
return columns.length;
}
#Override
public int getRowCount()
{
return inData.length;
}
#Override
public String getColumnName(int col)
{
return columns[col];
}
#Override
public boolean isCellEditable(int row ,int col)
{
return true;
}
//This method updates the Row of table
public void updateRow(int index,String[] values)
{
for (int i = 0 ; i < values.length ; i++)
{
setValueAt(values[i],index,i);
}
}
}
public static void main(String st[])
{
SwingUtilities.invokeLater( new Runnable()
{
#Override
public void run()
{
TableRowEdit td = new TableRowEdit();
td.prepareAndShowGUI();
}
});
}
}
UPDATE
Everything was fine with your original code. Keep the code as it was initially. The only problem was line userModel = new AllUser(); in method updateButtonActionPerformed. It was creating new object of AllUser instead of using the current one. So you should remove this line from updateButtonActionPerformed . and change the NewUserFrame_Edit constructor as follows:
public NewUserFrame_Edit(AllUser userModel/*Add this parameter*/,UserInformation userinf, int row) {
...
this.userModel = userModel;
jTextField1.setText(userinf.getFname().toString().trim());
jTextField2.setText(userinf.getLname().toString().trim());
if (userinf.getGender().equals("Male")) {
jRadioButton1.setSelected(true);
} else {
jRadioButton2.setSelected(true);
}
jTextField3.setText(userinf.getDate());
selectedrow = row;
setVisible(true);
}
change your as updateButtonActionPerformed follows:
private void updateButtonActionPerformed(java.awt.event.ActionEvent evt) {
//userModel = new AllUser();//Comment it.
userinf = new UserInformation();
userinf.setFname(jTextField1.getText());
userinf.setLname(jTextField2.getText());
userinf.setGender(gender);
userinf.setDate(jTextField3.getText());
userModel.setValueAt(userinf.getFname() , selectedrow, 1);
userModel.setValueAt(userinf.getLname() , selectedrow, 2);
userModel.setValueAt(userinf.getGender(), selectedrow , 3);
userModel.setValueAt(userinf.getDate() , selectedrow, 4);
userModel.updateFile(userModel.Udata);
NewUserFrame_Edit.this.dispose();
}
And changeeditUser(int row) method of class UserPage as follows:
public void editUser(int row)
{
UserInformation userInf = userModel.getSelectedMember(row);
NewUserFrame_Edit edit = new NewUserFrame_Edit(userModel,userInf, row);
}
Here is your updateFile methd:
public void updateFile(ArrayList<UserInformation> data) {
PrintWriter pw;
try {
pw = new PrintWriter(new FileWriter("AllUserRecords.txt"));
for (UserInformation userinf : data) {
String line = userinf.getID()
+ " " + userinf.getFname()
+ " " + userinf.getLname()
+ " " + userinf.getGender()
+ " " + userinf.getDate();
pw.println(line);
}
pw.close();
} catch (IOException ioe) {
}
}

Another way to implement changes through JTable is to use the code template below:
table.getModel().addTableModelListener(new TableModelListener(){
/**
* Called when table has been changed.
*/
#Override
public void tableChanged(TableModelEvent e) {
int row = e.getFirstRow();
int column = e.getColumn();
TableModel model = (TableModel) e.getSource();
String newdata = (String) model.getValueAt(row, column);
model.setValueAt(newdata, row, column);
// do your update with the newdata variable.
}
});
Here you can use the actual event to get the row and column of the cell that has been changed in the JTable variable.

How to adjust JTable columns to fit the longest content in column cells

I'm using answer https://stackoverflow.com/a/5820366 and http://tips4java.wordpress.com/2008/11/10/table-column-adjuster/ and it works, but frequently columns' sizes are too wide or too narrow.
No matter filling my table with HTML or text.
Using standard TableModel from oracle documentation.
Resize mode = JTable.AUTO_RESIZE_OFF
Container of my tabel is jGoodies:
FormLayout currentEventLayout = new FormLayout(
"fill:p",
"pref, pref");
PanelBuilder currentEventBuilder = new PanelBuilder(currentEventLayout);
currentEventBuilder.add(mainQuotesTable.getTableHeader(), constraints.xy(1, 1));
currentEventBuilder.add(mainQuotesTable, constraints.xy(1, 2));
HTML example:
"<html><pre><font size=+1 face='Arial'>" + firstValue + "\n" + secondValue + "</font></pre></html>"
simple row:
firstValue + " - " + secondValue
Here is the example:
public class TableAdjustExample {
private static JTable mainTable;
private static Random random = new Random();
private static List<Data> data;
private static class Data {
String name;
String surname;
private Data(String name, String surname) {
this.name = name;
this.surname = surname;
}
}
public static void main(String[] args) {
data = stubProvider();
final JFrame frame = new JFrame("table adjust example");
frame.add(createUI());
frame.pack();
frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
frame.setLocationRelativeTo(null);
frame.setSize(350, 400);
frame.setVisible(true);
update();
java.util.Timer timer = new java.util.Timer();
timer.schedule(new TimerTask() {
#Override
public void run() {
update();
}
}, 3000, 3000);
}
private static JPanel createUI() {
JPanel jPanel = new JPanel();
mainTable = new JTable(2, 3);
mainTable.setModel(new AbstractTableModel() {
#Override
public int getRowCount() {
return data.size();
}
#Override
public int getColumnCount() {
return 2;
}
#Override
public Object getValueAt(int rowIndex, int columnIndex) {
Data dataItem = data.get(rowIndex);
if (columnIndex == 0) {
return dataItem.name;
}
if (columnIndex == 1) {
return dataItem.surname;
}
throw new IllegalStateException();
}
});
mainTable.setGridColor(Color.black);
mainTable.setShowHorizontalLines(false);
mainTable.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
final TableCellRenderer defaultRenderer = mainTable.getTableHeader().getDefaultRenderer();
mainTable.getTableHeader().setDefaultRenderer(new TableCellRenderer() {
#Override
public Component getTableCellRendererComponent(JTable jTable, Object o, boolean b, boolean b1, int row, int column) {
JLabel parent = (JLabel) defaultRenderer.getTableCellRendererComponent(jTable, o, b, b1, row, column);
if (column == 0) {
parent.setText("name");
} else {
parent.setText("surname");
}
return parent;
}
});
jPanel.add(mainTable.getTableHeader());
jPanel.add(mainTable);
return jPanel;
}
private static void update() {
System.out.println("updating");
data = stubProvider();
adjustJTableRowSizes(mainTable);
for (int i = 0; i < mainTable.getColumnCount(); i++) {
adjustColumnSizes(mainTable, i, 2);
}
}
private static void adjustJTableRowSizes(JTable jTable) {
for (int row = 0; row < jTable.getRowCount(); row++) {
int maxHeight = 0;
for (int column = 0; column < jTable.getColumnCount(); column++) {
TableCellRenderer cellRenderer = jTable.getCellRenderer(row, column);
Object valueAt = jTable.getValueAt(row, column);
Component tableCellRendererComponent = cellRenderer.getTableCellRendererComponent(jTable, valueAt, false, false, row, column);
int heightPreferable = tableCellRendererComponent.getPreferredSize().height;
maxHeight = Math.max(heightPreferable, maxHeight);
}
jTable.setRowHeight(row, maxHeight);
}
}
public static void adjustColumnSizes(JTable table, int column, int margin) {
DefaultTableColumnModel colModel = (DefaultTableColumnModel) table.getColumnModel();
TableColumn col = colModel.getColumn(column);
int width;
TableCellRenderer renderer = col.getHeaderRenderer();
if (renderer == null) {
renderer = table.getTableHeader().getDefaultRenderer();
}
JLabel comp = (JLabel) renderer.getTableCellRendererComponent(
table, col.getHeaderValue(), false, false, 0, 0);
width = comp.getPreferredSize().width;
for (int r = 0; r < table.getRowCount(); r++) {
renderer = table.getCellRenderer(r, column);
comp = (JLabel) renderer.getTableCellRendererComponent(
table, table.getValueAt(r, column), false, false, r, column);
int currentWidth = comp.getPreferredSize().width;
width = Math.max(width, currentWidth);
}
width += 2 * margin;
col.setPreferredWidth(width);
}
private static List<Data> stubProvider() {
List<Data> data = new ArrayList<Data>();
for (int i = 0; i < 4; i++) {
data.add(new Data(
"<html>" +
"<div style='font-size: 15px'>Jason</div>" +
"<div style='font-size: 15px'>" + random.nextInt() + "</div>" +
"</html>",
"Statham " + random.nextInt()));
}
return data;
}
}
I have such problem with row height adjustment. Using of <pre>\n</pre> instead of <br> fixed row adjustment.

Seems to be working okay for me...
public class TestTable01 extends JPanel {
private JTable mainTable;
public TestTable01() {
super(new GridLayout(1, 0));
String[] columnNames = {"First Name",
"Last Name",
"Sport",
"# of Years",
"Vegetarian"};
Object[][] data = {
{"Kathy", "Smith",
"Snowboarding", new Integer(5), new Boolean(false)},
{"John", "Doe",
"Rowing", new Integer(3), new Boolean(true)},
{"Sue", "Black",
"Knitting", new Integer(2), new Boolean(false)},
{"Jane", "White",
"Speed reading", new Integer(20), new Boolean(true)},
{"Joe", "Brown",
"Pool", new Integer(10), new Boolean(false)}
};
mainTable = new JTable(data, columnNames);
mainTable.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
mainTable.setPreferredScrollableViewportSize(new Dimension(500, 70));
mainTable.setFillsViewportHeight(true);
update();
//Create the scroll pane and add the table to it.
JScrollPane scrollPane = new JScrollPane(mainTable);
//Add the scroll pane to this panel.
add(scrollPane);
}
/**
* 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("SimpleTableDemo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Create and set up the content pane.
TestTable01 newContentPane = new TestTable01();
newContentPane.setOpaque(true); //content panes must be opaque
frame.setContentPane(newContentPane);
//Display the window.
frame.pack();
frame.setVisible(true);
}
private void update() {
System.out.println("updating");
adjustJTableRowSizes(mainTable);
for (int i = 0; i < mainTable.getColumnCount(); i++) {
adjustColumnSizes(mainTable, i, 2);
}
}
private void adjustJTableRowSizes(JTable jTable) {
for (int row = 0; row < jTable.getRowCount(); row++) {
int maxHeight = 0;
for (int column = 0; column < jTable.getColumnCount(); column++) {
TableCellRenderer cellRenderer = jTable.getCellRenderer(row, column);
Object valueAt = jTable.getValueAt(row, column);
Component tableCellRendererComponent = cellRenderer.getTableCellRendererComponent(jTable, valueAt, false, false, row, column);
int heightPreferable = tableCellRendererComponent.getPreferredSize().height;
maxHeight = Math.max(heightPreferable, maxHeight);
}
jTable.setRowHeight(row, maxHeight);
}
}
public void adjustColumnSizes(JTable table, int column, int margin) {
DefaultTableColumnModel colModel = (DefaultTableColumnModel) table.getColumnModel();
TableColumn col = colModel.getColumn(column);
int width;
TableCellRenderer renderer = col.getHeaderRenderer();
if (renderer == null) {
renderer = table.getTableHeader().getDefaultRenderer();
}
Component comp = renderer.getTableCellRendererComponent(table, col.getHeaderValue(), false, false, 0, 0);
width = comp.getPreferredSize().width;
for (int r = 0; r < table.getRowCount(); r++) {
renderer = table.getCellRenderer(r, column);
comp = renderer.getTableCellRendererComponent(table, table.getValueAt(r, column), false, false, r, column);
int currentWidth = comp.getPreferredSize().width;
width = Math.max(width, currentWidth);
}
width += 2 * margin;
col.setPreferredWidth(width);
col.setWidth(width);
}
public static void main(String[] args) {
//Schedule a job for the event-dispatching thread:
//creating and showing this application's GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}
UPDATED
There are a number of issues with your example.
Tables really should be added to a JScrollPane, this will take care of adding the header...
The default layout manager for a JPanel is FlowLayout, in this case, it's probably not what you want, you probably want to use a BorderLayout
Swing is not thread safe. The user of java.util.Timer will violate this policy, this could cause the model and view to fall out sync. Use a javax.swing.Timer instead.
Rendering two <div> next to each will cause the html layout engine to place a weak break between the elements. That is, if the engine decides there's not enough available space to render the two elements together, it will split them. Better to use a single <div> with two <span> tags instead...
I would have a read of
Concurrency in Swing
How to Use Tables
public class TestColumnWidths {
private static JTable mainTable;
private static Random random = new Random();
private static List<Data> data;
private static class Data {
String name;
String surname;
private Data(String name, String surname) {
this.name = name;
this.surname = surname;
}
}
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
data = stubProvider();
final JFrame frame = new JFrame("table adjust example");
frame.add(createUI());
frame.pack();
frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
update();
// java.util.Timer timer = new java.util.Timer();
// timer.schedule(new TimerTask() {
// #Override
// public void run() {
// update();
// }
// }, 3000, 3000);
javax.swing.Timer timer = new javax.swing.Timer(3000, new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
update();
}
});
timer.setRepeats(true);
timer.setCoalesce(true);
timer.start();
}
});
}
private static JPanel createUI() {
JPanel jPanel = new JPanel();
mainTable = new JTable(2, 3);
mainTable.setModel(new AbstractTableModel() {
#Override
public int getRowCount() {
return data.size();
}
#Override
public int getColumnCount() {
return 2;
}
#Override
public Object getValueAt(int rowIndex, int columnIndex) {
Data dataItem = data.get(rowIndex);
if (columnIndex == 0) {
return dataItem.name;
}
if (columnIndex == 1) {
return dataItem.surname;
}
throw new IllegalStateException();
}
});
mainTable.setGridColor(Color.black);
mainTable.setShowHorizontalLines(false);
mainTable.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
final TableCellRenderer defaultRenderer = mainTable.getTableHeader().getDefaultRenderer();
mainTable.getTableHeader().setDefaultRenderer(new TableCellRenderer() {
#Override
public Component getTableCellRendererComponent(JTable jTable, Object o, boolean b, boolean b1, int row, int column) {
JLabel parent = (JLabel) defaultRenderer.getTableCellRendererComponent(jTable, o, b, b1, row, column);
if (column == 0) {
parent.setText("name");
} else {
parent.setText("surname");
}
return parent;
}
});
// jPanel.add(mainTable.getTableHeader());
// jPanel.add(mainTable);
jPanel.setLayout(new BorderLayout());
jPanel.add(new JScrollPane(mainTable));
return jPanel;
}
private static void update() {
System.out.println("updating");
data = stubProvider();
adjustJTableRowSizes(mainTable);
for (int i = 0; i < mainTable.getColumnCount(); i++) {
adjustColumnSizes(mainTable, i, 2);
}
}
private static void adjustJTableRowSizes(JTable jTable) {
for (int row = 0; row < jTable.getRowCount(); row++) {
int maxHeight = 0;
for (int column = 0; column < jTable.getColumnCount(); column++) {
TableCellRenderer cellRenderer = jTable.getCellRenderer(row, column);
Object valueAt = jTable.getValueAt(row, column);
Component tableCellRendererComponent = cellRenderer.getTableCellRendererComponent(jTable, valueAt, false, false, row, column);
int heightPreferable = tableCellRendererComponent.getPreferredSize().height;
maxHeight = Math.max(heightPreferable, maxHeight);
}
jTable.setRowHeight(row, maxHeight);
}
}
public static void adjustColumnSizes(JTable table, int column, int margin) {
DefaultTableColumnModel colModel = (DefaultTableColumnModel) table.getColumnModel();
TableColumn col = colModel.getColumn(column);
int width;
TableCellRenderer renderer = col.getHeaderRenderer();
if (renderer == null) {
renderer = table.getTableHeader().getDefaultRenderer();
}
Component comp = renderer.getTableCellRendererComponent(
table, col.getHeaderValue(), false, false, 0, 0);
width = comp.getPreferredSize().width;
for (int r = 0; r < table.getRowCount(); r++) {
renderer = table.getCellRenderer(r, column);
comp = renderer.getTableCellRendererComponent(
table, table.getValueAt(r, column), false, false, r, column);
int currentWidth = comp.getPreferredSize().width;
width = Math.max(width, currentWidth);
}
width += 2 * margin;
col.setPreferredWidth(width);
}
private static List<Data> stubProvider() {
List<Data> data = new ArrayList<Data>();
for (int i = 0; i < 4; i++) {
data.add(new Data(
"<html>"
+ "<div>"
+ "<span style='font-size: 15px'>Jason</span>"
+ "<span style='font-size: 15px'>" + random.nextInt() + "</span>"
+ "</div>"
+ "</html>",
"Statham " + random.nextInt()));
}
return data;
}
}

Set reasonable MinimumWidth for the columns which are too narrow. Then calculate width according to the contents of the columns and set them.

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