Changing Columns in JTable using JRadioButtons doesn't refresh structure

I've removed most of my GUI to keep the code short. I have a buttongroup of 3 JRadioButtons to select the table schema i want to display in my JTable, which is contained in a JScrollPane I have tried to use `fireTableStructureChanged()` and`fireTableDataChanged()` as well as `JTable.repaint()` to no avail. Can anyone help me? Here is a simple example that runs a window with my configuration but does not update the table. ``` public class test1 implements ActionListener { private boolean payrollActive = false; private JPanel mainPanel = new JPanel(); private JTable dataTable; private Vector<String> courseColumns = new Vector<String>(); private Vector<String> courseColumnsPay = new Vector<String>(); private Vector<String> profsColumns = new Vector<String>(); private Vector<String> offSpaceColumns = new Vector<String>(); public test1() { //Add columns for tables String[] courseColsPay = {"Year", "Program", "Course", "Code", "CCCode", "Weight", "Session", "Section", "Day", "STime", "FTime", "BookedRM", "EnrolCap", "Description", "ProfFName", "ProfLName", "ProfEmail", "Notes", "Syllabus", "Exam", "CrossList", "PreReqs", "EnrolCtrls", "Shared", "TrackChanges", "Address", "WageType", "BasePay", "BenefitRate", "Budgeted", "PayAmount", "MthAmount", "Term", "AccNumber", "PayAdmin", "PayableTo"}; for (String col : courseColsPay) { courseColumnsPay.add(col); } for (int i = 0; i < 25; i++) { courseColumns.add(courseColsPay[i]); } String[] profCols = {"FName", "LName", "Email", "UTEmail", "Birthdate", "OfficeBC", "OfficeRM", "Department", "Status", "Fellowship", "OfficeStat", "PhoneNum", "HomeAddr", "HomePhoneNum", "Notes"}; for (String col : profCols) { profsColumns.add(col); } String[] offSpaceCols = {"Building", "DeptID", "DivisionName", "BldgID", "RoomID", "Category", "Description", "ShareType", "DeptName", "Status", "SharePerc", "ShareOccupancy", "Area", "Fellow", "Commments", "Name", "Position", "Dept", "FTE", "CrossApp", "CrossPos", "CrossDept", "CrossFTE", "OtherOffice"}; for (String col : offSpaceCols) { offSpaceColumns.add(col); } mainPanel.setSize(1260, 630); mainPanel.setLayout(null); JRadioButton coursesBtn = new JRadioButton("Courses"); coursesBtn.setMnemonic(KeyEvent.VK_C); coursesBtn.setActionCommand("Course"); coursesBtn.setSelected(true); coursesBtn.addActionListener(this); JRadioButton profsBtn = new JRadioButton("Professors"); profsBtn.setMnemonic(KeyEvent.VK_P); profsBtn.setActionCommand("Professors"); coursesBtn.addActionListener(this); JRadioButton officeSpBtn = new JRadioButton("Office Spaces"); officeSpBtn.setMnemonic(KeyEvent.VK_O); officeSpBtn.setActionCommand("Office Spaces"); coursesBtn.addActionListener(this); ButtonGroup tablesBtns = new ButtonGroup(); tablesBtns.add(coursesBtn); tablesBtns.add(profsBtn); tablesBtns.add(officeSpBtn); JPanel tableRadioPanel = new JPanel(new GridLayout(0, 1)); tableRadioPanel.setOpaque(true); tableRadioPanel.setBounds(0, 0, 150, 70); tableRadioPanel.add(coursesBtn); tableRadioPanel.add(profsBtn); tableRadioPanel.add(officeSpBtn); //table start DefaultTableModel coursesModel = new DefaultTableModel(courseColumns, 200); dataTable = new JTable(coursesModel); dataTable.setFillsViewportHeight(true); dataTable.setAutoResizeMode(JTable.AUTO_RESIZE_OFF); JScrollPane scrollPane = new JScrollPane(dataTable, JScrollPane.VERTICAL_SCROLLBAR_ALWAYS, JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS); scrollPane.setBounds(160, 0, 1016, 558); //table code end mainPanel.add(tableRadioPanel); mainPanel.add(scrollPane); } public JComponent getMainPanel() { return mainPanel; } public JTable getDataTable() { return dataTable; } /** * Returns the list of columns for the given table * @param identifier the name of the table * @return a Vector<String> of column names */ public Vector<String> getColumns(String identifier) { switch (identifier) { case "Courses": if (payrollActive) { return courseColumnsPay; } else { return courseColumns; } case "Professors": return profsColumns; case "Office Spaces": return offSpaceColumns; default: return null; } } public static void createAndShowGui() { test1 vicu = new test1(); JFrame frame = new JFrame("Victoria University Database Application"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setSize(1260, 630); frame.setLocationRelativeTo(null); JLabel emptyLabel = new JLabel(""); emptyLabel.setPreferredSize(new Dimension(175, 100)); frame.getContentPane().add(emptyLabel, BorderLayout.CENTER); frame.getContentPane().add(vicu.getMainPanel()); frame.getContentPane().setLayout(null); frame.setVisible(true); } public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { public void run() { createAndShowGui(); } }); } @Override public void actionPerformed(ActionEvent e) { JRadioButton targetBtn = (JRadioButton) e.getSource(); ((DefaultTableModel) dataTable.getModel()). setColumnIdentifiers(getColumns(targetBtn.getText())); } } ```