JTable's setModel(..) problem
Here is my little problematic program:
import javax.swing.*;
import javax.swing.table.*;
publicclass MyTableextends JFrame{
publicstaticvoid main(String[] args){
MyTable frame =new MyTable();
int rows = 3, columns = 2;
DefaultTableModel model1 =new DefaultTableModel(rows, columns);
for (int r = 0; r < rows; r++)
for (int c = 0; c < columns; c++)
model1.setValueAt(new Integer(r + c), r, c);
DefaultTableModel model2 =new DefaultTableModel(rows + 1, columns + 1);
for (int r = 0; r < rows + 1; r++)
for (int c = 0; c < columns + 1; c++)
model2.setValueAt(new Integer(r * c), r, c);
JTable table =new JTable(model1);
table.setAutoCreateColumnsFromModel(false);
Object[] newColumnData1 ={10, 20, 30};
Object[] newColumnData2 ={100, 200, 300};
System.out.println(table.getRowCount() +" rows and " + table.getColumnCount() +" columns");
table.setModel(model2);
System.out.println(table.getRowCount() +" rows and " + table.getColumnCount() +" columns");
frame.add(table);
frame.setDefaultCloseOperation(EXIT_ON_CLOSE);
frame.pack();
frame.setVisible(true);
}
}
The problem is that after model2 is set, the table still has 2 columns (while the new model has 3). So, is it possible to set a new model such that the table will be updated automatically ?
[2582 byte] By [
leonarda] at [2007-11-26 20:01:31]
# 3
OK... Here is why I added this line:
import javax.swing.*;
import javax.swing.table.*;
public class MyTable extends JFrame {
public static void main(String[] args) {
MyTable frame = new MyTable();
int rows1 = 4, columns1 = 5;
DefaultTableModel model1 = new DefaultTableModel(rows1, columns1);
for (int r = 0; r < rows1; r++)
for (int c = 0; c < columns1; c++)
model1.setValueAt(new Integer(r + c), r, c);
int rows2 = 10, columns2 = 9;
DefaultTableModel model2 = new DefaultTableModel(rows2, columns2);
for (int r = 0; r < rows2; r++)
for (int c = 0; c < columns2; c++)
model2.setValueAt(new Integer(r * c), r, c);
JTable table = new JTable(model2);
table.setModel(model1);
System.out.println(table.getRowCount() + " rows and " + table.getColumnCount() + " columns");
Object[] newColumnData1 = {true, false, false, true};
Object[] newColumnData2 = {"a", "b", "c", "d"};
table.setAutoCreateColumnsFromModel(false); // MUST BE HERE
insertColumn(table, newColumnData1, 1);
insertColumn(table, newColumnData2, 3);
frame.add(table);
frame.setDefaultCloseOperation(EXIT_ON_CLOSE);
frame.pack();
frame.setVisible(true);
}
private static void insertColumn(JTable table, Object[] values, int index) {
DefaultTableModel model = (DefaultTableModel)table.getModel();
TableColumn column = new TableColumn(model.getColumnCount());
table.addColumn(column);
model.addColumn(null, values);
table.moveColumn(table.getColumnCount() - 1, index);
}
}
If you remove the line table.setAutoCreateColumnsFromModel(false); // MUST BE HERE
the insertColumn(..) method will not work properly !
How can I sove this contradiction ?
# 4
> So, is it possible to set a new model such that the table will be updated automatically ?
reset the setAutoCreateColumnsFromModel() to true before setting the model of the table.
> If you remove the line
> table.setAutoCreateColumnsFromModel(false); // MUST BE HERE
>the insertColumn(..) method will not work properly !
> How can I sove this contradiction ?
There is a problem with the way the two methods interact with one another.
a) the following works:
model.addColumn( ... );
table.moveColumn( ... );
b) adding and moving two columns doesn't work:
model.addColumn( ... );
table.moveColumn( ... );
model.addColumn( ... );
table.moveColumn( ... );
c) adding two columns, then moving two columns does work:
model.addColumn( ... );
model.addColumn( ... );
table.moveColumn( ... );
table.moveColumn( ... );
I don't know whats going on.
