[RESOLVIDO] Dúvida de orientação a objetos

package filtrartabela;

import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.RowFilter;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableModel;
import javax.swing.table.TableRowSorter;

public class JTableFilterDemo_Exemplo1 {

    public static void main(String[] args) {
        Object[][] data = {{"A", 5}, {"B", 2}, {"C", 4}, {"D", 8}};
        String columnNames[] = {"Item", "Value"};
        TableModel model = new DefaultTableModel(data, columnNames) {

            public Class<?> getColumnClass(int column) {
                return getValueAt(0, column).getClass();
            }
        };
        JTable table = new JTable(model);

        RowFilter<Object, Object> filter = new RowFilter<Object, Object>() {

            public boolean include(Entry entry) {
                Integer population = (Integer) entry.getValue(1);
                return population.intValue() > 3;
            }
        };

        TableRowSorter<TableModel> sorter = new TableRowSorter<TableModel>(model);
        sorter.setRowFilter(filter);
        table.setRowSorter(sorter);
        JScrollPane scrollPane = new JScrollPane(table);
        JFrame frame = new JFrame("Filtering Table");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add(scrollPane);
        frame.setSize(300, 200);
        frame.setVisible(true);
    }
}

Object[][] data = {{"A", 5}, {"B", 2}, {"C", 4}, {"D", 8}};
        String columnNames[] = {"Item", "Value"};
        TableModel model = new DefaultTableModel(data, columnNames)

private static List<Registro> banco = new ArrayList<Registro>();

public class ComponentesEspeciais {

    public void FiltraTabela() {

        TableModel model = new DefaultTableModel(new Object[][]{}, new String[]{"Domínio", "Usuário", "Senha"}) {

            @Override
            public Class<?> getColumnClass(int column) {
                return getValueAt(0, column).getClass();
            }
        };
        JTable table = new JTable(model);

        // igual ao exemplo -->
        RowFilter<Object, Object> filter = new RowFilter<Object, Object>() {

            public boolean include(Entry entry) {
                Integer population = (Integer) entry.getValue(1);
                return population.intValue() > 3;
            }
        };

        TableRowSorter<TableModel> sorter = new TableRowSorter<TableModel>(model);
        sorter.setRowFilter(filter);
        table.setRowSorter(sorter);
    }
}

TableModel model = new DefaultTableModel(new Object[][]{}, new String[]{"Domínio", "Usuário", "Senha"})

public Principal() {
        ComponentesEspeciais tabelaFiltro = new ComponentesEspeciais(); // isso aqui não deu certo mesmo
        initComponents(); // inicia os componentes da tabela criada automaticamente pelo netBeans
        this.setLocationRelativeTo(null);
        this.setVisible(true);
    }