，确定不能添加新的基于 DefaultTableModel 的JTable a>源自myTable.getModel()

• again, are you sure that you can't to add a new TableColumn to JTable based on DefaultTableModel initalized from myTable.getModel()

  EDIT现在，我无需转换即可看到(DefaultTableModel model = (DefaultTableModel) table.getModel();) JTable可以返回

  EDIT Now I can see without casting (DefaultTableModel model = (DefaultTableModel) table.getModel();) JTable can returns TableModel, and there isn't addColumn()

  import java.awt.BorderLayout;
  import java.awt.EventQueue;
  import java.awt.Font;
  import java.awt.event.ActionEvent;
  import java.awt.event.ActionListener;
  import java.util.Stack;
  import javax.swing.JButton;
  import javax.swing.JFrame;
  import javax.swing.JPanel;
  import javax.swing.JScrollPane;
  import javax.swing.JTable;
  import javax.swing.WindowConstants;
  import javax.swing.table.DefaultTableModel;
  import javax.swing.table.TableColumn;
  import javax.swing.table.TableColumnModel;
  
  public class TableRowHeight {
  
      private static final long serialVersionUID = 1L;
      private JFrame frame = new JFrame("p*s*s*s*s*t*t");
      private String[] columnNames = {"one", "two", "Playing with", "four", "five",};
      private String[][] data = {
          {"aaaaaa", "bbbbbb", "cccccc", "dddddd", "eeeeeee",},
          {"bbbbbb", "cccccc", "dddddd", "eeeeeee", "aaaaaa",},
          {"cccccc", "dddddd", "eeeeeee", "aaaaaa", "bbbbbb",},
          {"dddddd", "eeeeeee", "aaaaaa", "bbbbbb", "cccccc",},
          {"eeeeeee", "aaaaaa", "bbbbbb", "cccccc", "dddddd",}};
      private JTable table = new JTable(new DefaultTableModel(data, columnNames));
      private TableColumnModel tcm = table.getColumnModel();
      private Stack<TableColumn> colDeleted = new Stack<TableColumn>();
      private JButton restoreButton = new JButton("Restore Column Size");
      private JButton hideButton = new JButton("Set Column Size to Zero");
      private JButton deleteButton = new JButton("Delete Column");
      private JButton addButton = new JButton("Restore Column");
      private JButton addNewButton = new JButton("Add New Column");
      private int i = 1;
  
      public TableRowHeight() {
          table.setRowMargin(4);
          table.setRowHeight(30);
          table.setFont(new Font("SansSerif", Font.BOLD + Font.PLAIN, 20));
          JScrollPane scrollPane = new JScrollPane(table);
          for (int i = 0; i < (tcm.getColumnCount()); i++) {
              tcm.getColumn(i).setPreferredWidth(150);
          }
          table.setPreferredScrollableViewportSize(table.getPreferredSize());
          restoreButton.addActionListener(new ActionListener() {
              @Override
              public void actionPerformed(ActionEvent e) {
                  tcm.getColumn(2).setPreferredWidth(100);
              }
          });
          hideButton.addActionListener(new ActionListener() {
              @Override
              public void actionPerformed(ActionEvent e) {
                  tcm.getColumn(2).setPreferredWidth(000);
              }
          });
          deleteButton.addActionListener(new ActionListener() {
              @Override
              public void actionPerformed(ActionEvent e) {
                  if (table.getColumnCount() > 0) {
                      TableColumn colToDelete = table.getColumnModel().getColumn(table.getColumnCount() - 1);
                      table.removeColumn(colToDelete);
                      table.validate();
                      colDeleted.push(colToDelete);
                      addButton.setEnabled(true);
                  } else {
                      deleteButton.setEnabled(false);
                  }
              }
          });
          addButton.addActionListener(new ActionListener() {
              @Override
              public void actionPerformed(ActionEvent e) {
                  if (colDeleted.size() > 0) {
                      table.addColumn(colDeleted.pop());
                      table.validate();
                      deleteButton.setEnabled(true);
                  } else {
                      addButton.setEnabled(false);
                  }
              }
          });
          addNewButton.addActionListener(new ActionListener() {
              @Override
              public void actionPerformed(ActionEvent e) {
                  DefaultTableModel model = (DefaultTableModel) table.getModel();
                  model.addColumn("New Column " + i);
                  i++;
              }
          });
          JPanel btnPanel = new JPanel();
          btnPanel.add(hideButton);
          btnPanel.add(restoreButton);
          btnPanel.add(deleteButton);
          btnPanel.add(addButton);
          btnPanel.add(addNewButton);
          frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
          frame.add(scrollPane, BorderLayout.CENTER);
          frame.add(btnPanel, BorderLayout.SOUTH);
          frame.pack();
          frame.setLocation(150, 150);
          frame.setVisible(true);
      }
  
      public static void main(String[] args) {
          EventQueue.invokeLater(new Runnable() {
              @Override
              public void run() {
                  TableRowHeight frame = new TableRowHeight();
              }
          });
      }
  }