Mega Code Archive
Sorting a Column in a JTable Component
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import java.util.Arrays;
import java.util.Comparator;
import java.util.Vector;
import javax.swing.JTable;
import javax.swing.table.DefaultTableModel;
public class Main {
public static void main(String[] argv) throws Exception {
DefaultTableModel model = new DefaultTableModel();
JTable table = new JTable(model);
table.setAutoCreateColumnsFromModel(false);
boolean ascending = false;
Vector data = model.getDataVector();
Object[] colData = new Object[model.getRowCount()];
for (int i = 0; i < colData.length; i++) {
colData[i] = ((Vector) data.get(i)).get(0);
}
Arrays.sort(colData, new ColumnSorter());
for (int i = 0; i < colData.length; i++) {
((Vector) data.get(i)).set(0, colData[i]);
}
model.fireTableStructureChanged();
}
}
class ColumnSorter implements Comparator {
ColumnSorter() {
}
public int compare(Object a, Object b) {
if (a instanceof String && ((String) a).length() == 0) {
a = null;
}
if (b instanceof String && ((String) b).length() == 0) {
b = null;
}
if (a == null && b == null) {
return 0;
} else if (a == null) {
return 1;
} else if (b == null) {
return -1;
} else if (a instanceof Comparable) {
return ((Comparable) a).compareTo(b);
} else {
return a.toString().compareTo(b.toString());
}
}
}
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