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<TITLE>Using Built-in Cell Renderers and Editors in a JTable Component
(Java Developers Almanac Example)
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<META CONTENT="Patrick Chan" NAME="AUTHOR">
<META CONTENT="Code Examples from The Java Developers Almanac 1.4" NAME="DESCRIPTION">
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<h3>
e926.
Using Built-in Cell Renderers and Editors in a JTable Component</h3>
There are built-in cell renderers and editors available for seven
types - <code>Boolean</code>, <code>Date</code>, <code>Double</code>, <code>Float</code>,
<code>Icon</code>, <code>Number</code>, and <code>Object</code>. By default every column
uses the <code>Object</code> cell renderer and editor, regardless of the
column data type. There are two typical ways to force a column to use
a particular cell renderer and editor.
<P> The first way is to have the table model's
<code>getColumnClass()</code> method return the <code>Class</code> object for the
column data type. Typically this method is overridden to return the
<code>Class</code> object of the first cell in that column. The <code>Class</code>
object is then used to fetch the appropriate cell renderer and editor.
<P> The second way is to find the <code>TableColumn</code> associated with
the column data in the table model and explicitly set a cell renderer
and editor. This method must be used if two columns have different
cell renderers yet their data type is the same.
<pre>
DefaultTableModel model = new DefaultTableModel() {
// This method returns the Class object of the first
// cell in specified column in the table model.
// Unless this method is overridden, all values are
// assumed to be the type Object.
public Class getColumnClass(int columnIndex) {
Object o = getValueAt(0, columnIndex);
if (o == null) {
return Object.class;
} else {
return o.getClass();
}
}
};
JTable table = new JTable(model);
// Add a column for each of the available renderers
model.addColumn("Boolean", new Object[]{<font color="#0066ff"><i>Boolean.TRUE</i></font>});
model.addColumn("Date", new Object[]{<font color="#0066ff"><i>new Date()</i></font>});
model.addColumn("Double", new Object[]{new Double(<font color="#0066ff"><i>Math.PI</i></font>)});
model.addColumn("Float", new Object[]{new Float(<font color="#0066ff"><i>1.2</i></font>)});
model.addColumn("Icon", new Object[]{new ImageIcon(<font color="#0066ff"><i>"icon.gif"</i></font>)});
model.addColumn("Number", new Object[]{new Integer(<font color="#0066ff"><i>1</i></font>)});
model.addColumn("Object", new Object[]{<font color="#0066ff"><i>"object"</i></font>});
// Explicitly set the Boolean cell renderer and editor on the
// TableColumn showing the first column in the table model
int mColIndex = <font color="#0066ff"><i>0</i></font>;
findTableColumn(table, mColIndex).setCellRenderer(table.getDefaultRenderer(Boolean.class));
findTableColumn(table, mColIndex).setCellEditor(table.getDefaultEditor(Boolean.class));
// Returns the TableColumn associated with the specified column
// index in the model
public TableColumn findTableColumn(JTable table, int columnModelIndex) {
Enumeration enum = table.getColumnModel().getColumns();
for (; enum.hasMoreElements(); ) {
TableColumn col = (TableColumn)enum.nextElement();
if (col.getModelIndex() == columnModelIndex) {
return col;
}
}
return null;
}
</pre>
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Related Examples
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e925. <a class="eglink" href="SetValue.html?l=rel">
Getting and Setting a Cell Value in a JTable Component
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e927. <a class="eglink" href="CustRend.html?l=rel">
Creating a Custom Cell Renderer in a JTable Component
</a>
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e928. <a class="eglink" href="CustRendClass.html?l=rel">
Creating a Class-based Custom Cell Renderer in a JTable Component
</a>
<br>
e929. <a class="eglink" href="CopyPaste.html?l=rel">
Copying Cell Values to the Clipboard from a JTable Component
</a>
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See also:
<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#Columns">
Columns
</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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