Example Depot

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 the values in the second column of the model // in descending order int mColIndex = 1; boolean ascending = false; sortColumn(model, mColIndex, ascending); // Regardless of sort order (ascending or descending), null values always appear last. // colIndex specifies a column in model. public void sortColumn(DefaultTableModel model, int colIndex, boolean ascending) { Vector data = model.getDataVector(); Object[] colData = new Object[model.getRowCount()]; // Copy the column data in an array for (int i=0; i<colData.length; i++) { colData[i] = ((Vector)data.get(i)).get(colIndex); } // Sort the array of column data Arrays.sort(colData, new ColumnSorter(ascending)); // Copy the sorted values back into the table model for (int i=0; i<colData.length; i++) { ((Vector)data.get(i)).set(colIndex, colData[i]); } model.fireTableStructureChanged(); } public class ColumnSorter implements Comparator { boolean ascending; ColumnSorter(boolean ascending) { this.ascending = ascending; } public int compare(Object a, Object b) { // Treat empty strains like nulls if (a instanceof String && ((String)a).length() == 0) { a = null; } if (b instanceof String && ((String)b).length() == 0) { b = null; } // Sort nulls so they appear last, regardless // of sort order if (a == null && b == null) { return 0; } else if (a == null) { return 1; } else if (b == null) { return -1; } else if (a instanceof Comparable) { if (ascending) { return ((Comparable)a).compareTo(b); } else { return ((Comparable)b).compareTo(a); } } else { if (ascending) { return a.toString().compareTo(b.toString()); } else { return b.toString().compareTo(a.toString()); } } } }