how did Walter Laan says in his thread
Never give up! Never surrender!
EDIT: I can’t resist, but due to my poor English I dare not to commenting why, where and how is that possible, nor works correctly, for confirmations I added Rob’s two (little bit) modified class for TableColumnRendering …,
import java.awt.EventQueue;
import java.math.RoundingMode;
import java.text.*;
import java.util.*;
import javax.swing.*;
import javax.swing.RowSorter.SortKey;
import javax.swing.SwingConstants;
import javax.swing.table.*;
public class TableExample extends JFrame {
public static final Object EMPTY_ROW = "";
private static final long serialVersionUID = 1L;
private JTable tab;
private Calendar cal;
private Date dateWithOutTime = new java.util.Date();
private SimpleDateFormat sdf = new SimpleDateFormat("dd.MM.yyyy");//standard continental EU date format
public class EmptyRowComparator<COLUMN_TYPE extends Comparable<COLUMN_TYPE>> implements Comparator<Object> {//extends RuleBasedCollator{
private TableRowSorter<? extends AbstractTableMod> sorter;
private int column;
public EmptyRowComparator(TableRowSorter<? extends AbstractTableMod> sorter, int col) throws ParseException {
this.sorter = sorter;
this.column = col;
}
private int getSortOrder() {
SortOrder order = SortOrder.ASCENDING;
for (SortKey sortKey : sorter.getSortKeys()) {
if (sortKey.getColumn() == this.column) {
order = sortKey.getSortOrder();
break;
}
}
return order == SortOrder.ASCENDING ? 1 : -1;
}
@Override
public int hashCode() {
return 0;
}
@Override
@SuppressWarnings("unchecked")
public int compare(Object arg0, Object arg1) {
boolean empty1 = arg0 == EMPTY_ROW;
boolean empty2 = arg1 == EMPTY_ROW;
if (empty1 && empty2) {
return 0;
} else if (empty1) {
return 1 * getSortOrder();
} else if (empty2) {
return -1 * getSortOrder();
}
return ((Comparable<COLUMN_TYPE>) (COLUMN_TYPE) arg0).compareTo((COLUMN_TYPE) arg1);
}
}
public class ConcreteTable extends AbstractTableMod {
private static final long serialVersionUID = 4672561280810649603L;
private String[] columnNames = {"Integer", "String", "Integer", "Double", "Boolean", "Double", "String", "Boolean", "Date"};
private Class<?>[] types = {Integer.class, String.class, String.class, String.class, String.class,
String.class, String.class, String.class, String.class};
private int minimumDisplayedRow;
public ConcreteTable() {
this.minimumDisplayedRow = 10;
this.datas = new ArrayList<ArrayList<Object>>();
for (int i = 0; i < this.minimumDisplayedRow; i++) {
this.addEmptyRow();
}
Random rnd = new Random();
for (int i = 0; i < 7; i++) {
ArrayList<Object> row = new ArrayList<Object>();
row.add(i);
row.add(((rnd.nextInt(25)) + "prova"));
row.add(rnd.nextInt(25));
row.add(rnd.nextInt(25) + 3.14);
row.add((i % 2 == 0) ? true : false);
row.add(rnd.nextInt(25) + 3.14);
row.add(((rnd.nextInt(25)) + "prova"));
row.add((i % 2 == 0) ? false : true);
cal = Calendar.getInstance();
cal.add(Calendar.DATE, -rnd.nextInt(25));
dateWithOutTime = cal.getTime();
String nullTimeForDateString = sdf.format(dateWithOutTime);
try {
dateWithOutTime = sdf.parse(nullTimeForDateString);
} catch (ParseException ex) {
}
row.add(dateWithOutTime);
this.addRow(row);
}
}
@Override
public String getColumnName(int col) {
System.out.println("getColumnName " + col + " = " + columnNames[col]);
return columnNames[col];
}
@Override
protected Class<?>[] getTypeArray() {
return this.types;
}
@Override
protected ArrayList<Integer> getKeysColumnIndex() {
ArrayList<Integer> keys = new ArrayList<Integer>();
keys.add(0);
return keys;
}
@Override
public boolean isCellEditable(int row, int col) {
System.out.println("isCellEditable row " + row + " col " + col);
if (col == 1) {
System.out.println("TRUE");
return true;
}
return false;
}
@Override
protected Object getGeneratedKeys(int col) {
if (col != 0) {
return null;
}
return new Integer(this.rowNumber);
}
@Override
protected int getMinimumDisplayedRow() {
return this.minimumDisplayedRow;
}
}
public abstract class AbstractTableMod extends AbstractTableModel {
private static final long serialVersionUID = 1L;
protected ArrayList<ArrayList<Object>> datas;
protected int rowNumber = 0;
protected abstract Class<?>[] getTypeArray();
protected abstract ArrayList<Integer> getKeysColumnIndex();
protected abstract Object getGeneratedKeys(int col);
protected abstract int getMinimumDisplayedRow();
public int getRowCount() {
return this.datas.size();
}
@Override
public int getColumnCount() {
return this.getTypeArray().length;
}
@Override
public Object getValueAt(int rowIndex, int columnIndex) {
if (rowIndex >= this.rowNumber) {
return EMPTY_ROW;
}
try {
ArrayList<Object> row = this.datas.get(rowIndex);
if (row == null) {
return null;
}
Object obj = row.get(columnIndex);
return obj;
} catch (IndexOutOfBoundsException e) {
return null;
}
}
@Override
public void setValueAt(Object value, int row, int col) {
Class<? extends Object> targetColClass = this.getColumnClass(col);
if (!targetColClass.isInstance(value)) {
return;
}
if (value instanceof String) {
String stringVal = (String) value;
if (stringVal.compareTo("") == 0) {
return;
}
}
if (row >= this.rowNumber) {
ArrayList<Object> newRow = new ArrayList<Object>();
ArrayList<Integer> keysIndexList = this.getKeysColumnIndex();
for (int i = 0; i < this.getColumnCount(); i++) {
if (i == col) {
newRow.add(value);
} else if (keysIndexList.contains(i)) {
newRow.add(this.getGeneratedKeys(i));
} else {
newRow.add(EMPTY_ROW);
}
}
this.addRow(newRow);
} else {
this.datas.get(row).set(col, value);
}
this.fireTableCellUpdated(row, col);
}
@Override
@SuppressWarnings("unchecked")
public Class<? extends Object> getColumnClass(int c) {
if (c > this.getTypeArray().length - 1) {
return null;
} else {
return this.getTypeArray()[c];
}
}
public void addEmptyRow() {
ArrayList<Object> emptyRow = new ArrayList<Object>();
for (int i = 0; i < this.getTypeArray().length; i++) {
emptyRow.add(EMPTY_ROW);
}
this.datas.add(emptyRow);
}
public void addRow(ArrayList<Object> row) {
Object[] types = this.getTypeArray();
if (types.length != row.size()) {
return;
}
for (int i = 0; i < row.size(); i++) {
Class<? extends Object> targetColClass = this.getColumnClass(i);
Object rowItem = row.get(i);
}
this.datas.add(this.rowNumber, row);
this.rowNumber++;
if (this.rowNumber < this.getMinimumDisplayedRow()) {
this.datas.remove(this.datas.size() - 1);
}
this.fireTableRowsInserted(this.rowNumber, this.rowNumber);
}
}
public TableExample() {
super("JTable example");
getContentPane().setLayout(new BoxLayout(getContentPane(), BoxLayout.Y_AXIS));
ConcreteTable model = new ConcreteTable();
tab = new JTable(model);
TableRowSorter<ConcreteTable> sorter = new TableRowSorter<ConcreteTable>(model);
try {
sorter.setComparator(0, new EmptyRowComparator<Integer>(sorter, 0));
sorter.setComparator(1, new EmptyRowComparator<String>(sorter, 1));
sorter.setComparator(2, new EmptyRowComparator<String>(sorter, 2));
sorter.setComparator(3, new EmptyRowComparator<String>(sorter, 3));
sorter.setComparator(4, new EmptyRowComparator<String>(sorter, 4));
sorter.setComparator(5, new EmptyRowComparator<String>(sorter, 5));
sorter.setComparator(6, new EmptyRowComparator<String>(sorter, 6));
sorter.setComparator(7, new EmptyRowComparator<String>(sorter, 7));
sorter.setComparator(8, new EmptyRowComparator<String>(sorter, 8));
} catch (ParseException e) {
e.printStackTrace();
}
tab.setRowSorter(sorter);
JScrollPane table = new JScrollPane(tab);
this.getContentPane().add(table);
this.setSize(800, 400);
setDefaultCloseOperation(EXIT_ON_CLOSE);
setRenderers();
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
setVisible(true);
}
});
//TableExample tableExample = new TableExample();
}
public void setRenderers() {
TableColumnModel m = tab.getColumnModel();
//"Integer", "String", "Interger", "Double", "Boolean", "Double", "String", "Boolean", "Date"
m.getColumn(0).setCellRenderer(NumberRenderer.getIntegerRenderer());
m.getColumn(2).setCellRenderer(NumberRenderer.getIntegerRenderer());
m.getColumn(3).setCellRenderer(NumberRenderer.getDoubleRenderer5());
m.getColumn(5).setCellRenderer(NumberRenderer.getDoubleRenderer3());
m.getColumn(8).setCellRenderer(FormatRenderer.getDateRenderer());
}
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
TableExample tableExample = new TableExample();
}
});
TableExample tableExample = new TableExample();
}
}
class FormatRenderer extends DefaultTableCellRenderer {
private static final long serialVersionUID = 1L;
private Format formatter;
private static DateFormat dateFormat = new SimpleDateFormat("dd.MM.yyyy");//standard continental EU date format
FormatRenderer(Format formatter) {
this.formatter = formatter;
}
@Override
public void setValue(Object value) {
try {
if ((value != null)) {
if ((value instanceof Number) || (value instanceof Date)) {
setHorizontalAlignment(SwingConstants.RIGHT);
value = formatter.format(value);
}
}
} catch (IllegalArgumentException e) {
}
super.setValue(value);
}
public static FormatRenderer getDateRenderer() {
return new FormatRenderer(dateFormat);
}
}
class NumberRenderer extends FormatRenderer {
private static final long serialVersionUID = 1L;
private static Number numberValue;
private static NumberFormat nf;
NumberRenderer(NumberFormat formatter) {
super(formatter);
setHorizontalAlignment(SwingConstants.RIGHT);
}
public static NumberRenderer getIntegerRenderer() {
return new NumberRenderer(NumberFormat.getIntegerInstance());
}
public static NumberRenderer getDoubleRenderer3() {
nf = NumberFormat.getNumberInstance();
nf.setMinimumFractionDigits(3);
nf.setMaximumFractionDigits(3);
nf.setRoundingMode(RoundingMode.HALF_UP);
return new NumberRenderer(nf);
}
public static NumberRenderer getDoubleRenderer5() {
nf = NumberFormat.getNumberInstance();
nf.setMinimumFractionDigits(5);
nf.setMaximumFractionDigits(5);
nf.setRoundingMode(RoundingMode.HALF_UP);
return new NumberRenderer(nf);
}
}