Find column # by column name or header - JTable

Question

I want to implement a general validation class for my jtables in different forms to check the qty column , as the qty column No in different tables of different forms is different. For this i want to get the column value by column Name similarly in C# or VB.

My requirement is as follows.

 int qty=jtable.getValueAt(rowNo,"columnName");

Now i am using

 int qty=jtable.getValueAt(rowNo,colNo);

Is there any way to find column # by column Name or Header Of JTable?

Answer 1

You should try using this:

int qty = jtable.getValueAt( rowNo, jtable.getColumn("columnName").getModelIndex() );

Answer 2

You should probably be asking the TableModel, rather than the JTable, which may have its columns rearranged. One approach would be to let your TableModel implement a suitable interface, for example,

public interface Quantifiable {
    public int getQuantity(int row);
}

Addendum: Please tell how to implement this interface.

Much depends on the relationship among your existing TableModel classes. Lets say the all have a numeric quantity in some column. If quantityCol is the model index a column having the type Number, you could do something like this:

public class QuantifiableTableModel
        extends AbstractTableModel implements Quantifiable {

    private int quantityCol;

    public QuantifiableTableModel(int quantityCol) {
        this.quantityCol = quantityCol;
    }

    @Override
    public int getQuantity(int row) {
        Number n = (Number) getValueAt(row, quantityCol);
        return n.intValue();
    }
    ...
}