从JTable获取DefaultTableModel
我想从JTable获取DefaultTableModel然后添加Column。 我在JTable中搜索但只找到getModel（）方法。然后无法添加Column。 最后说我在JTable中使用Binding方法设置Date，然后没有DefaultTableModel，我想要添加列内容JButton添加到My JTable。
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再次，你确定你不能基于从
myTable.getModel()DefaultTableModel向JTable添加一个新的TableColumn -
编辑现在我可以看到没有强制转换
(DefaultTableModel model = (DefaultTableModel) table.getModel();)JTable可以返回TableModel ，并且没有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 colDeleted = new Stack (); 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(); } }); } }