不知道在哪里放置java代码以防止列混乱

我有以下代码：我想防止重新排序列标题。 我不确定在哪里放置以下代码来执行此操作以及我需要放置的括号（如果有）：

table.getTableHeader().setReorderingAllowed(false); 

我的代码如下

 public class JavaApplication2 extends javax.swing.JFrame{ String driverName = "net.sourceforge.jtds.jdbc.Driver"; String serverName = "xx"; String serverPort = "xx"; String database = serverName + ":" + serverPort; String url = "jdbc:jtds:sqlserver:/" + database; String username = "xx"; String password = "xx"; public JavaApplication2() throws SQLException { ArrayList columnNames = new ArrayList(); ArrayList data = new ArrayList(); try { Class.forName(driverName); Connection connection = DriverManager.getConnection(url, username, password); // Create and execute an SQL statement that returns some data. String SQL = "xx"; Statement stmt = connection.createStatement(); ResultSet rs = stmt.executeQuery(SQL); ResultSetMetaData rsmetadata = rs.getMetaData(); int columns = rsmetadata.getColumnCount(); // Get column names for (int i = 1; i <= columns; i++) { boolean add; add = columnNames.add( rsmetadata.getColumnName(i) ); } // Get row data while (rs.next()) { ArrayList row; row = new ArrayList(columns); for (int i = 1; i <= columns; i++) { boolean add; add = row.add( rs.getObject(i) ); } boolean add; add = data.add( row ); } } catch (SQLException e) { System.out.println( e.getMessage() ); } catch (ClassNotFoundException ex) { Logger.getLogger(JavaApplication2.class.getName()).log(Level.SEVERE, null, ex); } Vector columnNamesVector = new Vector(); Vector dataVector = new Vector(); for (int i = 0; i < data.size(); i++) { ArrayList subArray = (ArrayList)data.get(i); Vector subVector = new Vector(); for (int j = 0; j < subArray.size(); j++) { boolean add; add = subVector.add(subArray.get(j)); } boolean add; add = dataVector.add(subVector); } for (int i = 0; i < columnNames.size(); i++ ){ boolean add ; add = columnNamesVector.add(columnNames.get(i)); } // Create table with database data JTable table; table = new JTable(dataVector, columnNamesVector) //table.getTableHeader().setReorderingAllowed(false) //table.tableHeader.reOrderingAllowed(false); { public Class getColumnClass(int column) { for (int row = 0; row < getRowCount(); row++) { Object o = getValueAt(row, column); if (o != null) { return o.getClass(); } } return Object.class; } }; JScrollPane scrollPane = new JScrollPane( table ); getContentPane().add( scrollPane ); JPanel buttonPanel = new JPanel(); getContentPane().add( buttonPanel, BorderLayout.SOUTH ); } } 

Answer 1

你可以调用table.getTableHeader().setReorderingAllowed(false); 定义你的表后。

在您的代码中，您已声明并初始化了表。

  JTable table; // start of creating table table = new JTable(dataVector, columnNamesVector){ public Class getColumnClass(int column) { for (int row = 0; row < getRowCount(); row++) { Object o = getValueAt(row, column); if (o != null) { return o.getClass(); } } return Object.class; } }; //end of creating table 

所以你可以调用table.getTableHeader().setReorderingAllowed(false); 在那行之后。在您的代码中，您调用setReorderingAllowed的地方不正确，因为它在表创建中。 public Class getColumnClass方法在表创建代码中。

如此完整的代码是......

  JTable table; table = new JTable(dataVector, columnNamesVector){ public Class getColumnClass(int column) { for (int row = 0; row < getRowCount(); row++) { Object o = getValueAt(row, column); if (o != null) { return o.getClass(); } } return Object.class; } }; //call setReorderingAllowed here table.getTableHeader().setReorderingAllowed(false);