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<TITLE>Removing a Column from a JTable Component (Java Developers Almanac Example)
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<h3>e922. Removing a Column from a JTable Component</h3>
To remove a column to a <code>JTable</code> component, the component must use
a table model that supports this operation. A simple implementation
of such a table model is <code>DefaultTableModel</code>.
<P> <code>DefaultTableModel.removeColumn()</code> removes the visible
column, but leaves the column data in the table model. This example
provides a routine that removes both the visible column and the column
data.
<pre> DefaultTableModel model = new MyDefaultTableModel();
JTable table = new JTable(model);
table.setModel(model);
// Create 3 columns
model.addColumn(<font color="#0066ff"><i>"Col1"</i></font>);
model.addColumn(<font color="#0066ff"><i>"Col2"</i></font>);
model.addColumn(<font color="#0066ff"><i>"Col3"</i></font>);
model.addRow(new Object[]{<font color="#0066ff"><i>"v1"</i></font>});
// Remove the first visible column without removing the underlying data
table.removeColumn(table.getColumnModel().getColumn(0));
// Disable autoCreateColumnsFromModel to prevent
// the reappearance of columns that have been removed but
// whose data is still in the table model
table.setAutoCreateColumnsFromModel(false);
// Remove the first visible column and its data
removeColumnAndData(table, 0);
// Remove the last visible column and its data
removeColumnAndData(table, table.getColumnCount()-1);
// Removes the specified column from the table and the associated
// call data from the table model.
public void removeColumnAndData(JTable table, int vColIndex) {
MyDefaultTableModel model = (MyDefaultTableModel)table.getModel();
TableColumn col = table.getColumnModel().getColumn(vColIndex);
int columnModelIndex = col.getModelIndex();
Vector data = model.getDataVector();
Vector colIds = model.getColumnIdentifiers();
// Remove the column from the table
table.removeColumn(col);
// Remove the column header from the table model
colIds.removeElementAt(columnModelIndex);
// Remove the column data
for (int r=0; r<data.size(); r++) {
Vector row = (Vector)data.get(r);
row.removeElementAt(columnModelIndex);
}
model.setDataVector(data, colIds);
// Correct the model indices in the TableColumn objects
// by decrementing those indices that follow the deleted column
Enumeration enum = table.getColumnModel().getColumns();
for (; enum.hasMoreElements(); ) {
TableColumn c = (TableColumn)enum.nextElement();
if (c.getModelIndex() >= columnModelIndex) {
c.setModelIndex(c.getModelIndex()-1);
}
}
model.fireTableStructureChanged();
}
// This subclass adds a method to retrieve the columnIdentifiers
// which is needed to implement the removal of
// column data from the table model
class MyDefaultTableModel extends DefaultTableModel {
public Vector getColumnIdentifiers() {
return columnIdentifiers;
}
}
</pre>
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<b>Related Examples</b></font></td>
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</table>
e915. <a class="eglink" href="ConvertColIndex.html?l=rel">
Converting a Column Index Between the View and Model in a JTable Component
</a>
<br>
e916. <a class="eglink" href="EnumCols.html?l=rel">
Enumerating the Columns in a JTable Component
</a>
<br>
e917. <a class="eglink" href="ColSize.html?l=rel">
Setting the Width of a Column in a JTable Component
</a>
<br>
e918. <a class="eglink" href="ColResize.html?l=rel">
Setting the Column Resize Mode of a JTable Component
</a>
<br>
e919. <a class="eglink" href="LockCol.html?l=rel">
Locking the Width of a Column in a JTable Component
</a>
<br>
e920. <a class="eglink" href="AppendCol.html?l=rel">
Appending a Column to a JTable Component
</a>
<br>
e921. <a class="eglink" href="InsertCol.html?l=rel">
Inserting a Column in a JTable Component
</a>
<br>
e923. <a class="eglink" href="MoveCol.html?l=rel">
Moving a Column in a JTable Component
</a>
<br>
e924. <a class="eglink" href="NoHeadMove.html?l=rel">
Allowing the User to Move a Column in a JTable Component
</a>
<br>
e925. <a class="eglink" href="NoResizeHead.html?l=rel">
Allowing the User to Resize a Column in a JTable Component
</a>
<br>
<table width="600" CELLSPACING="0" CELLPADDING="2" BORDER="0">
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See also:
<a class="eglink" href="/egs/javax.swing.table/pkg.html?l=rel#Cells">
Cells
</a>
<a class="eglink" href="/egs/javax.swing.table/pkg.html?l=rel#Column%20Heads">
Column Heads
</a>
<a class="eglink" href="/egs/javax.swing.table/pkg.html?l=rel#Editing">
Editing
</a>
<a class="eglink" href="/egs/javax.swing.table/pkg.html?l=rel#Events">
Events
</a>
<a class="eglink" href="/egs/javax.swing.table/pkg.html?l=rel#Layout">
Layout
</a>
<a class="eglink" href="/egs/javax.swing.table/pkg.html?l=rel#Rows">
Rows
</a>
<a class="eglink" href="/egs/javax.swing.table/pkg.html?l=rel#Scrolling">
Scrolling
</a>
<a class="eglink" href="/egs/javax.swing.table/pkg.html?l=rel#Selection">
Selection
</a>
<a class="eglink" href="/egs/javax.swing.table/pkg.html?l=rel#Sorting">
Sorting
</a>
<a class="eglink" href="/egs/javax.swing.table/pkg.html?l=rel#Table%20Model">
Table Model
</a>
<a class="eglink" href="/egs/javax.swing.table/pkg.html?l=rel#Tool%20Tips">
Tool Tips
</a>
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