先感谢下 scbb无私的帮助！
我写了个 Java的程序，里面有用到 JScrollPane。 有用到 2个按钮，其中一个是 Add，另一个是 Delete，分别对 JScrollPane 做添加行 和 删除行操作。
代码如下：
- Java code
import java.awt.Toolkit;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.awt.event.KeyEvent;import java.awt.event.KeyListener;import java.awt.event.MouseEvent;import java.awt.event.MouseListener;import java.math.BigDecimal;import java.text.SimpleDateFormat;import java.util.Date;import java.util.Vector;import javax.swing.DefaultCellEditor;import javax.swing.JButton;import javax.swing.JComponent;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JPanel;import javax.swing.JScrollPane;import javax.swing.JTable;import javax.swing.JTextField;import javax.swing.KeyStroke;import javax.swing.ListSelectionModel;import javax.swing.ScrollPaneLayout;import javax.swing.SwingConstants;import javax.swing.event.ChangeEvent;import javax.swing.event.ListSelectionEvent;import javax.swing.event.ListSelectionListener;import javax.swing.table.DefaultTableCellRenderer;import javax.swing.table.DefaultTableModel;import javax.swing.table.TableCellRenderer;import javax.swing.table.TableColumn;import javax.swing.text.AttributeSet;import javax.swing.text.BadLocationException;import javax.swing.text.PlainDocument;public class GlobalVari_13 extends JFrame implements KeyListener, ActionListener { private static final long serialVersionUID = 1L; private static double select = 0; private static int rowIndex = 0; public JTable table = null; public JButton buttonAdd = new JButton("Add"); public JButton buttonDel = new JButton("Delete"); public JButton buttonCls = new JButton("Close"); // 表格方法使用 public GlobalVari_13() { init(); this.setTitle("Global Variables"); this.setSize(new Dimension(650, 400)); this.setLocationRelativeTo(null); this.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE); this.setVisible(true); // this.setResizable(false); } class SymListener implements ActionListener { public void actionPerformed(ActionEvent e) { Object obj = e.getSource(); if (obj == buttonDel) { buttonDel_actionPerformed(e); } } } private void init() { Vector<String> colHeader = new Vector<String>(); Vector<Vector<String>> dataVec = new Vector<Vector<String>>(); colHeader.add("Variable"); colHeader.add("Value "); colHeader.add("Time "); table = new JTable(dataVec, colHeader) { private static final long serialVersionUID = 1L; public boolean isCellEditable(int row, int column) { if (column > 1) { return false; } else { return true; } } public void editingStopped(ChangeEvent ce) { super.editingStopped(ce); int row = getSelectedRow(); int col = getSelectedColumn(); if (row >= 0 && col == 0) { Object value = getValueAt(row, col); DefaultTableModel model = (DefaultTableModel) table .getModel(); boolean exist = false; for (int i = 0; i < model.getRowCount(); i++) { if (model.getValueAt(i, 0).equals((String) value) && i != row) { exist = true; break; } } if (exist == true) { if (select == 1) { model.removeRow(rowIndex); select = 0; buttonDel.setEnabled(false); } } } else if (row >= 0 && col == 1) { Object value = getValueAt(row, col); // 检查是不是浮点数 try { double tempVal = Double.parseDouble((String) value); setValueAt(BigDecimal.valueOf(tempVal) .stripTrailingZeros(), row, col); } catch (Exception e) { // 不是浮点 setValueAt("", row, col); } } else return; } }; /*DefaultTableModel model1 = (DefaultTableModel) table.getModel(); model1.addRow(new Object[] { "gvar" + 1, "a", new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date()) });*/ // 2设置表头行高 table.getTableHeader().setPreferredSize(new Dimension(0, 20)); // 3设置表内容行高 table.setRowHeight(20); // 4设置单选模式 table.getSelectionModel().setSelectionMode( ListSelectionModel.SINGLE_SELECTION); // 5设置单元格不可拖动 table.getTableHeader().setReorderingAllowed(false); // 6设置不可改变列宽 table.getTableHeader().setResizingAllowed(false); // 7设置列宽 table.getColumnModel().getColumn(0).setPreferredWidth(95); table.getColumnModel().getColumn(1).setPreferredWidth(55); table.getColumnModel().getColumn(2).setPreferredWidth(30); // 注意索引越界 DefaultTableCellRenderer right = new DefaultTableCellRenderer(); right.setHorizontalAlignment(SwingConstants.RIGHT); table.getColumnModel().getColumn(1).setCellRenderer(right); table.getColumnModel().getColumn(2).setCellRenderer(right); ((DefaultTableCellRenderer) table.getTableHeader().getDefaultRenderer()) .setHorizontalAlignment(JLabel.RIGHT); TableColumn column = table.getColumnModel().getColumn(0); MultiLineHeaderRenderer headerRenderer = new MultiLineHeaderRenderer( SwingConstants.LEFT, SwingConstants.CENTER); column.setHeaderRenderer(headerRenderer); // 把Value列设为只能输入浮点数 column = table.getColumnModel().getColumn(1); JTextField textField = new JTextField(); textField.setDocument(new DoubleDocument()); textField.setHorizontalAlignment(JTextField.RIGHT); column.setCellEditor(new DefaultCellEditor(textField)); TableRowSorter<TableModel> sorter = new TableRowSorter<TableModel>( table.getModel()); table.setRowSorter(sorter); buttonAdd.setMnemonic(KeyEvent.VK_A); buttonAdd.setActionCommand("Add"); buttonAdd.addActionListener(this); buttonDel.setMnemonic(KeyEvent.VK_D); buttonDel.setActionCommand("Delete"); buttonDel.addActionListener(this); SymListener symListener = new SymListener(); buttonDel.addActionListener(symListener); // 设置快捷键 buttonDel.registerKeyboardAction(symListener, KeyStroke.getKeyStroke(KeyEvent.VK_DELETE, 0), JComponent.WHEN_IN_FOCUSED_WINDOW); // 确定按钮为 "DELETE" rowIndex = table.getSelectedRow(); System.out.println("index: " + rowIndex); // 监听事件 table.getSelectionModel().addListSelectionListener( new ListSelectionListener() { public void valueChanged(ListSelectionEvent e) { if (e.getValueIsAdjusting()) {// 连续操作 rowIndex = table.getSelectedRow(); if (rowIndex != -1) { System.out.println("Selected row: " + rowIndex); buttonDel.setEnabled(true); select = 1; } } } }); JScrollPane scrollPane = new JScrollPane(); scrollPane.setLayout(new ScrollPaneLayout()); scrollPane.setViewportView(table); scrollPane.setBounds(5, 5, 515, 350); this.getContentPane().add(scrollPane); buttonAdd.setEnabled(true); buttonDel.setEnabled(false); buttonCls.setEnabled(true); JPanel panel = new JPanel(); panel.setBounds(520, 5, 10, 350); this.getContentPane().add(panel); panel.setLayout(null); panel.add(buttonAdd); buttonAdd.setSize(100, 22); buttonAdd.setLocation(530, 6); panel.add(buttonDel); buttonDel.setSize(100, 22); buttonDel.setLocation(530, 40); panel.add(buttonCls); buttonCls.setSize(100, 22); buttonCls.setLocation(530, 322); buttonCls.addMouseListener(new MouseListener() { public void mouseClicked(MouseEvent e) { setVisible(false); } public void mousePressed(MouseEvent e) { } public void mouseReleased(MouseEvent e) { } public void mouseEntered(MouseEvent e) { } public void mouseExited(MouseEvent e) { } }); this.pack(); } public void actionPerformed(ActionEvent e) { buttonAdd_actionPerformed(e); buttonDel_actionPerformed(e); } public void buttonAdd_actionPerformed(ActionEvent e) { if ("Add".equals(e.getActionCommand())) { DefaultTableModel model = (DefaultTableModel) table.getModel(); int rownum = table.getRowCount() + 1; boolean exist = false; for (int i = 0; i < model.getRowCount(); i++) { if (model.getValueAt(i, 0).equals("gvar" + rownum)) { exist = true; break; } } if (exist == false) model.addRow(new Object[] { "gvar" + rownum, 0, new SimpleDateFormat("yyyy-MM-dd HH:mm:ss") .format(new Date()) }); } } public void buttonDel_actionPerformed(ActionEvent e) { if ("Delete".equals(e.getActionCommand()) || e.getSource() == buttonDel) { if (select == 1) { DefaultTableModel model = (DefaultTableModel) table.getModel(); model.removeRow(rowIndex); select = 0; buttonDel.setEnabled(false); } } } class DoubleDocument extends PlainDocument { private static final long serialVersionUID = 1L; public void insertString(int offset, String string, AttributeSet attributeSet) throws BadLocationException { try { int length = getLength(); String currentContent = getText(0, length); StringBuffer currentBuffer = new StringBuffer(currentContent); currentBuffer.insert(offset, string); String newValue = currentBuffer.toString(); Double.parseDouble(newValue); } catch (Exception ex) { Toolkit.getDefaultToolkit().beep(); return; } super.insertString(offset, string, attributeSet); } } public static void main(String[] args) { new GlobalVari_13(); }}