Table Model Listener in Java

[Damien25]

Hello everyone,
I have used JTable, for making a table. But now I want to use the table model object which can manage the data displayed by the table. I have tried lot of different things, but was not getting the proper output. So please help me by telling how to use Table Model Listener in Java Any other information related to the same topic would be grateful. Expecting some help sooner.!!

[absolute55]

Since you have used JTable, you should know that JTable object inherits a DefaultTable object if no custom TableModel object is specified. Also you may be knowing that this model only manages strings by default. If you are having any calculations or if you want to retrieve data from databases, then you must create your own custom TableModel object. And that TableModel object must implement the TableModel interface. Also you will have to implement the TableModelListener interface to detect changes to the data managed by a table model object.

[Zecho]

In simple words, TableModelListener defines the interface for an object that listens to changes in a TableModel. Every table object uses a table model object to manage the actual table data. You should also know the method before using the table model listener. The following is the method of TableModelListener Interface :

• tableChanged(TableModelEvent) - This method is called when the structure of or data in the table has changed.

[Praetor]

Many times you need to use the TableModelEvent API. The following are the methods of TableModelEvent API :

• Object getSource() - This method returns the object that fired the event.
• int getColumn() - This method returns the index of the column that changed.
• int getFirstRow() - This method returns the index of the first row that changed.
• int getLastRow() - When the last row is changed, then this method returns the index.
• int getType() - When there is something change in cell, then this method is called.

[void]

You will have to create a table for using the table model listener. For creating table you use JTable, you can look at the following coding that explains you how to create table model with code :

new AbstTableModel() {
    public String getColumnName(int col) {
        return columnNames[col].toString();
    }
    public int getRowCount() { return rowData.length; }
    public int getColumnCount() { return columnNames.length; }
    public Object getValueAt(int row, int col) {
        return rowData[row][col];
    }
    public boolean isCellEditable(int row, int col)
        { return true; }
    public void setValueAt(Object value, int row, int col) {
        rowData[row][col] = value;
        fireTableCellUpdated(row, col);
    }
}