JTable Selection and TableModel

Question

I am facing an issue with JTable and the TableModel associated with it. The problem here is that let's say if I make a row/rows selections on my JTable, I would like to get the particular row object from the TableModel and pass it somewhere. Does anyone know how to do this efficiently?

Answer 1

Assuming you have a custom TableModel, you can do this:

@Override
public Object getValueAt(int rowIndex, int columnIndex) {
if (rowIndex >= items.size()) {
    return null;
}
Object obj = items.get(rowIndex);
if (obj == null) {
      return null;
}

switch (columnIndex){
case -1:
          return obj;
    case 0: ...

(Assuming that items is the List where you store your objects)

... and then when you need the object at a given row, just take it by calling tableModel.getValueAt(row, -1);

Answer 2

I have done a similar application. In my task I have to get the data (row/rows) from one table and drag it to another table. i.e, if a user select row/rows from one table he should be able to drag to another table.

When an user selects a row use tableA.getSelectedRow(). Now loop over to get all the columns for each selected row. Store each row in a String and use new line character as an end to a row. While importing parse through the string and get each row.

// Sample code that I have worked on.
protected String exportString(JComponent c) {
JTable table = (JTable) c;
rows = table.getSelectedRows();
int colCount = table.getColumnCount();
    StringBuffer buff = new StringBuffer();
for (int i = 0; i < rows.length; i++) {
     for (int j = 0; j < colCount; j++) {
          Object val = table.getValueAt(rows[i], j);
          if (j != colCount - 1) {
              buff.append(",");
          }
         }
     if (i != rows.length - 1) {
         buff.append("\n");
     }
     }
     System.out.println("Export Success");
 return buff.toString();
}

Hope this may help you.