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<TITLE>Sorting the Rows in a JTable Component Based on a Column (Java Developers Almanac Example)
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<h1>The Java Developers Almanac 1.4</h1>
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<B><A HREF="../javax.swing.table/pkg.html#Sorting">Sorting</A></B><font color="#666666" class="xsmall-font">
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<h3>e961. Sorting the Rows in a JTable Component Based on a Column</h3>
This example implements a method that sorts all the rows in a
<code>DefaultTableModel</code> based on the values of the column.
<pre> DefaultTableModel model = new DefaultTableModel();
JTable table = new JTable(model);
// Add data here...
// Disable autoCreateColumnsFromModel otherwise all the column customizations
// and adjustments will be lost when the model data is sorted
table.setAutoCreateColumnsFromModel(false);
// Sort all the rows in descending order based on the
// values in the second column of the model
sortAllRowsBy(model, <font color="#0066ff"><i>1</i></font>, <font color="#0066ff"><i>false</i></font>);
// Regardless of sort order (ascending or descending), null values always appear last.
// colIndex specifies a column in model.
public void sortAllRowsBy(DefaultTableModel model, int colIndex, boolean ascending) {
Vector data = model.getDataVector();
Collections.sort(data, new ColumnSorter(colIndex, ascending));
model.fireTableStructureChanged();
}
// This comparator is used to sort vectors of data
public class ColumnSorter implements Comparator {
int colIndex;
boolean ascending;
ColumnSorter(int colIndex, boolean ascending) {
this.colIndex = colIndex;
this.ascending = ascending;
}
public int compare(Object a, Object b) {
Vector v1 = (Vector)a;
Vector v2 = (Vector)b;
Object o1 = v1.get(colIndex);
Object o2 = v2.get(colIndex);
// Treat empty strains like nulls
if (o1 instanceof String && ((String)o1).length() == 0) {
o1 = null;
}
if (o2 instanceof String && ((String)o2).length() == 0) {
o2 = null;
}
// Sort nulls so they appear last, regardless
// of sort order
if (o1 == null && o2 == null) {
return 0;
} else if (o1 == null) {
return 1;
} else if (o2 == null) {
return -1;
} else if (o1 instanceof Comparable) {
if (ascending) {
return ((Comparable)o1).compareTo(o2);
} else {
return ((Comparable)o2).compareTo(o1);
}
} else {
if (ascending) {
return o1.toString().compareTo(o2.toString());
} else {
return o2.toString().compareTo(o1.toString());
}
}
}
}
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<b>Related Examples</b></font></td>
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e962. <a class="eglink" href="SortCol.html?l=rel">
Sorting a Column in a JTable Component
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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#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#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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