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copied!<p>EDIT based on commnets</p> <p>rows in JTable is based on two Dimensional arrays, then</p> <pre><code>private String[] data = {"7:00", "8:00", "9:00" , "10:00" , "11:00" , "12:00" }; </code></pre> <p>should be</p> <pre><code>private String[][] data = {{"7:00", null, null}, {"8:00", null, null}, {"9:00", null, null}, {"10:00", null, null}, {"11:00", null, null}, {"12:00", null, null}}; </code></pre> <p>for defined Columns</p> <p><img src="https://i.stack.imgur.com/wwqEy.jpg" alt="enter image description here"></p> <p>from code</p> <pre><code>import javax.swing.JFrame; import javax.swing.JScrollPane; import javax.swing.JTable; import javax.swing.ScrollPaneConstants; import javax.swing.event.TableModelListener; import javax.swing.table.AbstractTableModel; public class MyTable { private JFrame frame = new JFrame("TableDemo"); private JScrollPane tableScroll = new JScrollPane(); private MyTableModel tableModel = new MyTableModel(); private JTable dialogTable = new JTable(tableModel); public MyTable() { dialogTable.setPreferredScrollableViewportSize(dialogTable.getPreferredSize()); tableScroll = new JScrollPane(dialogTable, ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED, ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED); frame.add(tableScroll); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.pack(); frame.setLocationByPlatform(true); frame.setVisible(true); System.out.println(dialogTable.getRowCount()); System.out.println(dialogTable.getColumnCount()); System.out.println(tableModel.getRowCount()); System.out.println(tableModel.getColumnCount()); } private class MyTableModel extends AbstractTableModel { private String[] columnNames = {"Termin", "Ime i prezime", "Napomena"}; private String[][] data = {{"7:00", null, null}, {"8:00", null, null}, {"9:00", null, null}, {"10:00", null, null}, {"11:00", null, null}, {"12:00", null, null}}; @Override public void addTableModelListener(TableModelListener arg0) { // TODO Auto-generated method stub } @Override public Class<?> getColumnClass(int columnNames) { switch (columnNames) { case 0: return String.class;//return Date.class; case 1: return String.class;//return Double.class; case 2: return String.class;//return Boolean.class; default: return String.class; } } @Override public int getColumnCount() { return columnNames.length; } @Override public int getRowCount() { return data.length; // <<----- this line is problem } @Override public String getColumnName(int col) { return columnNames[col]; } @Override public Object getValueAt(int row, int col) { // TODO Auto-generated method stub return null; } @Override public boolean isCellEditable(int row, int col) { if (col > 0) { return true; } else { return false; } } @Override public void removeTableModelListener(TableModelListener arg0) { // TODO Auto-generated method stub } @Override public void setValueAt(Object data, int row, int col) { // TODO Auto-generated method stub } } public static void main(String[] args) { javax.swing.SwingUtilities.invokeLater(new Runnable() { @Override public void run() { MyTable myTable = new MyTable(); } }); } } </code></pre>

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