This helper class can be used to help java programmer dealing with JTable.

JTableHelper.java

package helper;

/*
    Author: Imam Hidayat (mokhamad.imam[at]students.paramadina.ac.id)
    Universitas Paramadina
    
    Source: https://gist.github.com/imamhidayat92/5418619
    
    This helper class can be used to simplify JTable usage in Java.
*/

import java.sql.*;

import java.util.ArrayList;

import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.DefaultTableModel;

public class JTableHelper {    
    public static DefaultTableModel convertResultSetToDefaultTableModel(ResultSet results, String[] columns, String[] dbColumns) throws SQLException {
        ArrayList<String[]> data = new ArrayList<String[]>();
        
        while (results.next()) {
            String[] row = new String[dbColumns.length];
            
            for (int i = 0; i < dbColumns.length; i++) {
                row[i] = results.getString(dbColumns[i]);
            }
            
            data.add(row);
        }
        
        Object[][] tableModelData = new Object[data.size()][columns.length];

        for (int i = 0; i < data.size(); i++) {
            for (int j = 0; j < columns.length; j++) {
                tableModelData[i][j] = data.get(i)[j];
            }
        }
        
        return new DefaultTableModel(tableModelData, columns);
    }
    
    
    public static DefaultTableModel convertResultSetToDefaultTableModel(ResultSet results, String[] columns, int[] dbColumns) throws SQLException {
        ArrayList<String[]> data = new ArrayList<String[]>();
        
        while (results.next()) {
            String[] row = new String[dbColumns.length];
            
            for (int i = 0; i < dbColumns.length; i++) {
                row[i] = results.getString(dbColumns[i]);
            }
            
            data.add(row);
        }
        
        Object[][] tableModelData = new Object[data.size()][columns.length];

        for (int i = 0; i < data.size(); i++) {
            for (int j = 0; j < columns.length; j++) {
                tableModelData[i][j] = data.get(i)[j];
            }
        }
        
        return new DefaultTableModel(tableModelData, columns);
    }
    
    public static DefaultTableModel convertResultSetToDefaultTableModel(ResultSet results, String[] columns, int[] dbColumns, String[][] references) throws SQLException {
        ArrayList<String[]> data = new ArrayList<String[]>();
        
        while (results.next()) {
            String[] row = new String[dbColumns.length];
            
            for (int i = 0; i < dbColumns.length; i++) {
                if (references[i] != null) {
                    row[i] = references[i][results.getInt(dbColumns[i])];
                }
                else {
                    row[i] = results.getString(dbColumns[i]);
                }                
            }
            
            data.add(row);
        }
        
        Object[][] tableModelData = new Object[data.size()][columns.length];

        for (int i = 0; i < data.size(); i++) {
            for (int j = 0; j < columns.length; j++) {
                tableModelData[i][j] = data.get(i)[j];
            }
        }
        
        return new DefaultTableModel(tableModelData, columns);
    }
    
    /* Table Updater */
    
    public static void updateTable(JScrollPane scrollPane, JTable table, DefaultTableModel tableModel) {
        if (table != null) {
            table.setModel(tableModel);
        }
        else {
            table = new JTable(tableModel);
        }
        
        scrollPane.setViewportView(table);
    }
    
    public static void updateTable(JScrollPane scrollPane, JTable table, ResultSet results, String[] columns, String[] dbColumns) throws SQLException {
        DefaultTableModel tableModel = JTableHelper.convertResultSetToDefaultTableModel(results, columns, dbColumns);
        
        if (table != null) {
            table.setModel(tableModel);
        }
        else {
            table = new JTable(tableModel);
        }
        
        scrollPane.setViewportView(table);
    }    
    
    public static void updateTable(JScrollPane scrollPane, JTable table, ResultSet results, String[] columns, int[] dbColumns) throws SQLException {
        DefaultTableModel tableModel = JTableHelper.convertResultSetToDefaultTableModel(results, columns, dbColumns);
        
        if (table != null) {
            table.setModel(tableModel);
        }
        else {
            table = new JTable(tableModel);
        }
        
        scrollPane.setViewportView(table);
    }
    
    public static void updateTable(JScrollPane scrollPane, JTable table, ResultSet results, String[] columns, int[] dbColumns, String[][] references) throws SQLException {
        DefaultTableModel tableModel = JTableHelper.convertResultSetToDefaultTableModel(results, columns, dbColumns, references);
        
        if (table != null) {
            table.setModel(tableModel);
        }
        else {
            table = new JTable(tableModel);
        }
        
        scrollPane.setViewportView(table);
    }
    
    public static void removeRow(JTable table, int rowNumber, int columnCount) {
        ArrayList<ArrayList<Object>> newData = new ArrayList<ArrayList<Object>>();
        
        for (int i = 0; i < table.getModel().getRowCount(); i++) {
            if (i == rowNumber) {
                ArrayList<Object> row = new ArrayList<Object>();
                for (int j = 0; j < columnCount; j++) {
                    row.add(table.getModel().getValueAt(i, j));
                }

                newData.add(row); 
            }
        }
        
        ArrayList<String> columns = new ArrayList<String>();
        
        for (int i = 0; i < columnCount; i++) {
            columns.add(table.getColumnName(i));
        }
        
        table.setModel(new DefaultTableModel(convertArrayListToObjectArray(newData, columnCount), columns.toArray()));
    }
    
    public static void appendRow(JTable table, Object[] newRow, int columnCount) {
        ArrayList<ArrayList<Object>> newData = new ArrayList<ArrayList<Object>>();
        
        for (int i = 0; i < table.getModel().getRowCount(); i++) {
            ArrayList<Object> row = new ArrayList<Object>();
            for (int j = 0; j < columnCount; j++) {
                row.add(table.getModel().getValueAt(i, j));
            }
            
            newData.add(row); 
        }
        
        ArrayList<String> columns = new ArrayList<String>();
        
        for (int i = 0; i < columnCount; i++) {
            columns.add(table.getColumnName(i));
        }
                
        table.setModel(new DefaultTableModel(convertArrayListToObjectArray(newData, columnCount), columns.toArray()));
    }
    
    /* Miscellaneous */
    
    public static Object[][] convertArrayListToObjectArray(ArrayList<ArrayList<Object>> data, int columnCount) {
        Object[][] newData = new Object[data.size()][columnCount];
        
        for (int i = 0; i < data.size(); i++) {
            for (int j = 0; j < columnCount; j++) {
                newData[i][j] = data.get(i).get(j);
            }
        }
        
        return newData;
    }
}

mantapp.. ini gimana caranya?

Gampang, tinggal pakai di DefaultTableModel sesuai kebutuhan. :)

Contoh:

ResultSet results = MySQLConnector.executeQuery("some query");

Object[][] data = JTableHelper.convertResultSetToTableData(results);

DefaultTableModel tableModel = new DefaultTableModel(data, columns);
table.setModel(tableModel);