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Reg Appending new row to already existing JTable

Muralidhar Krishnamoorthy

Joined: Mar 18, 2001
Posts: 13
Can anybody tell me as to how to append a row at the end of an already visible to dynamically adjust the table size?
amit bargotra

Joined: Jan 06, 2001
Posts: 8
Make use of the AbstractTableModel interface.It has the methods
getRowCount(),getColumnCount(),getValueAt() etc.It'll help in dynamically increasing the rows and also changing the values on the fly.
the code written below will surely help plz go through this code and tell me weather it helped u or not.

public class TableDemo extends JFrame {
private boolean DEBUG = true;
public TableDemo() {
MyTableModel myModel = new MyTableModel();
JTable table = new JTable(myModel); table.setPreferredScrollableViewportSize(new Dimension(500, 70)); //Create the scroll pane and add the table to it. JScrollPane scrollPane = new JScrollPane(table); //Add the scroll pane to this window. getContentPane().add(scrollPane, BorderLayout.CENTER); addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) { System.exit(0); } }); }
class MyTableModel extends AbstractTableModel {
final String[] columnNames = {"First Name", "Last Name","Sport", "# of Years","amit"};
final Object[][] data = {
{"Mary","Campione",snowboarding" ,new Integer(5), new Boolean(false)}, {"Alison", "Huml", "Rowing", new Integer(3), new Boolean(true)}, {"Kathy", "Walrath", "Chasing toddlers", new Integer(2), new Boolean(false)}, {"Mark", "Andrews", "Speed reading", new Integer(20), new Boolean(true)}, {"Angela", "Lih", "Teaching high school", new Integer(4), new Boolean(false)} };
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]; }
/* * JTable uses this method to determine the default renderer/ * editor for each cell. If we didn't implement this method, * then the last column would contain text ("true"/"false"), * rather than a check box */ public Class getColumnClass(int c) { return getValueAt(0, c).getClass(); } /* * Don't need to implement this method unless your table's * editable. */ public boolean isCellEditable(int row, int col) { //Note that the data/cell address is constant, //no matter where the cell appears onscreen. if (col < 2) { return false; } else { return true; } } /* * Don't need to implement this method unless your table's * data can change. */ public void setValueAt(Object value, int row, int col) { if (DEBUG) { System.out.println("Setting value at " + row + "," + col + " to " + value + " (an instance of " + value.getClass() + ")"); } if (data[0][col] instanceof Integer && !(value instanceof Integer)) { //With JFC/Swing 1.1 and JDK 1.2, we need to create //an Integer from the value; otherwise, the column //switches to contain Strings. Starting with v 1.3, //the table automatically converts value to an Integer, //so you only need the code in the 'else' part of this //'if' block. //XXX: See for a better solution!!! try { data[row][col] = new Integer(value.toString()); fireTableCellUpdated(row, col); } catch (NumberFormatException e) { JOptionPane.showMessageDialog(TableDemo.this, "The \"" + getColumnName(col) + "\" column accepts only integer values."); } } else { data[row][col] = value; fireTableCellUpdated(row, col); } if (DEBUG) { System.out.println("New value of data:"); printDebugData(); } } private void printDebugData() { int numRows = getRowCount();
int numCols = getColumnCount();
for (int i=0; i < numRows; i++) { System.out.print(" row " + i + ":"); for (int j=0; j < numCols; j++) { System.out.print(" " + data[i][j]); } System.out.println(); } System.out.println("--------------------------"); } } public static void main(String[] args) { TableDemo frame = new TableDemo(); frame.pack(); frame.setVisible(true); }}
Muralidhar Krishnamoorthy

Joined: Mar 18, 2001
Posts: 13
Thanx a lot for the code....let me go through...BTW i never thought that ill get such a quick reply!!! Im stunned....Kudos to you Amit
Ekrem Saban

Joined: Dec 03, 2012
Posts: 2
I contribute with a user-friendly coding...

Campbell Ritchie

Joined: Oct 13, 2005
Posts: 39436
Welcome to the Ranch

I hope OP wasn’t holding his breath; that question was 11 years old It is good to have a legible version of the code, however.
Consider Paul's rocket mass heater.
subject: Reg Appending new row to already existing JTable