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Reg Appending new row to already existing JTable

 
Muralidhar Krishnamoorthy
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Posts: 13
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Can anybody tell me as to how to append a row at the end of an already visible JTable...ie...how to dynamically adjust the table size?
 
amit bargotra
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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 u.so 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() {
super("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 TableEditDemo.java 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
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Posts: 13
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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
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I contribute with a user-friendly coding...

 
Campbell Ritchie
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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.
 
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