Can I define size for DefaultTableModel?

Question

I'm using model, that I could refresh content of table? But I addedd it to a JPanel, and now my second JPanel, which contans button, goes very deep. I'm using GridLayout for controling size of column(preferredSize()). At start I have http://www.funkyimg.com/u2/3264/877/343679Untitled.jpg and then I have to manually make it bigger to http://www.funkyimg.com/u2/3264/878/776480Untitled2.jpg Source code I'm using from previous post, slightly modified:

public class Arsti3 {
JFrame main = new JFrame("Arst");
JPanel tP = new JPanel(new GridLayout(1,0));
JPanel bP = new JPanel();
JButton one = new JButton("Test");
JButton two = new JButton("Two");
JTable table = new JTable();
DefaultTableModel model;
Vector columnNames = new Vector();
Vector data = new Vector();

Arsti3() {
    main.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    main.setSize(840,400);
    try {
        reloadData();
        model = new DefaultTableModel(data,columnNames);
        table.setModel(model);

        //table.setRowHeight(24);
        table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
        TableColumn col;
        for(int i=0; i<table.getColumnCount(); i++) {
            col = table.getColumnModel().getColumn(i);
            col.setPreferredWidth(100);
            col.setMaxWidth(500);
        }
        //table.setPreferredScrollableViewportSize(new Dimension(500,500));
        //model.fireTableDataChanged();
        tP.add(new JScrollPane(table));
        bP.add(one);
        bP.add(two);
        main.add(tP,BorderLayout.NORTH);
        main.add(bP,BorderLayout.SOUTH);
    } catch(Exception e) {
        e.printStackTrace();
    }
    main.setVisible(true);

}

private void reloadData() throws ClassNotFoundException, SQLException {
    columnNames.clear();
    data.clear();
    Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
    String Base = "jdbc:odbc:Driver={Microsoft Access Driver (*.mdb)}; DBQ=SL.mdb";
    Connection con = DriverManager.getConnection(Base,"","");
    Statement st = con.createStatement();
    ResultSet res = st.executeQuery("SELECT * FROM Arsti");
    ResultSetMetaData rsmd = res.getMetaData();
    int column = rsmd.getColumnCount();         
    columnNames.addElement("ID");
    columnNames.addElement("Vards");
    columnNames.addElement("Uzvards");
    columnNames.addElement("Dzimums");
    columnNames.addElement("Personas kods");
    columnNames.addElement("Telefona numurs");
    columnNames.addElement("Nodalas ID");
    columnNames.addElement("Amata ID");
    while(res.next()) {
        Vector row = new Vector(column);
        for(int i=1; i<=column; i++) {
            row.addElement(res.getObject(i));
        }
        data.addElement(row);
    }
}

public static void main(String[] args) {
    new Arsti3();
}
}

I was about to advise using PNG instead of JPG when I thought to check the current images first. I ended up at a site that did not have English text, except for a prompt to 'click something' & no image. I'm out of there! — Andrew Thompson, Mar 18 '13 at 18:52
-1 for not learning (as I commented in your last question: you _must not_ change the data structure under the feet of the tableModel, instead do the reload with model api) — kleopatra, Mar 18 '13 at 18:55
@kleopatra if I could understand what are you talking about, I would try to do It)) — usr999, Mar 18 '13 at 18:57
which part of _use model api_ is so hard to understand? Read the api doc of DefaultTableModel, find the methods that allow to add a row and ... use them ;-) — kleopatra, Mar 18 '13 at 19:00
*"if I could understand"* When you do not understand, ***ask*** instead of ignoring the advice! — Andrew Thompson, Mar 18 '13 at 19:01
@kleopatra's point about the model is right: you can _update_ it in place, as shown below. — trashgod, Mar 19 '13 at 01:10

trashgod · Accepted Answer · 2013-03-19T01:12:14.330

Kudos for using a layout, but don't forget to pack() the enclosing Window. Also,

setPreferredScrollableViewportSize() is a bit arbitrary, so you may as well make the Dimension an integral multiple of something.
Swing GUI objects should be constructed and manipulated only on the event dispatch thread.
Use model.setRowCount(0) to clear your model, rather than replacing it each time.

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.GridLayout;
import java.util.Vector;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableColumn;

public class Arsti3 {

    private static final int WIDE = 100;
    private JFrame main = new JFrame("Arst");
    private JPanel tP = new JPanel(new GridLayout());
    private JPanel bP = new JPanel();
    private JButton one = new JButton("One");
    private JButton two = new JButton("Two");
    private Vector<String> columnNames = new Vector<String>();
    private Vector<Object> data = new Vector<Object>();
    private DefaultTableModel model = new DefaultTableModel(data, columnNames);
    private JTable table = new JTable();

    Arsti3() {
        reloadData();
        table.setModel(model);
        table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
        for (int i = 0; i < table.getColumnCount(); i++) {
            TableColumn col = table.getColumnModel().getColumn(i);
            col.setPreferredWidth(WIDE);
            col.setMaxWidth(WIDE * 5);
        }
        table.setPreferredScrollableViewportSize(new Dimension(
            table.getColumnCount() * WIDE, table.getRowHeight() * 16));
        tP.add(new JScrollPane(table));
        bP.add(one);
        bP.add(two);
        main.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        main.add(tP, BorderLayout.CENTER);
        main.add(bP, BorderLayout.SOUTH);
        main.pack();
        main.setVisible(true);

    }

    private void reloadData() {
        // could be factored out
        columnNames.clear();
        columnNames.addElement("ID");
        columnNames.addElement("Vards");
        columnNames.addElement("Uzvards");
        columnNames.addElement("Dzimums");
        columnNames.addElement("Personas kods");
        columnNames.addElement("Telefona numurs");
        columnNames.addElement("Nodalas ID");
        columnNames.addElement("Amata ID");
        model.setRowCount(0); // clear rows
        // add rows here
    }

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                new Arsti3();
            }
        });
    }
}

I don't understand. Please edit your question to show your current approach. — trashgod, Apr 05 '13 at 19:42

Can I define size for DefaultTableModel?

1 Answers1