java.lang.ArrayIndexOutOfBoundsException: 7 >= 7

Question

我很难把14行数据从我的jTable放到我的Textfield，你们能帮我吗？我对编码很陌生。

    try {

        String data = jSubject.getSelectedItem().toString();

        Class.forName("org.h2.Driver");
        Connection conn = DriverManager.getConnection("jdbc:h2:dist/Database/./h2database/recordDB", "test", "test");
        Statement st = conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_UPDATABLE);
        String sql = "Select * from " + data;

        ResultSet rs = st.executeQuery(sql);

        DefaultTableModel a = (DefaultTableModel) jTable2.getModel();
        a.setRowCount(0);
        while (rs.next()) {
            String q = rs.getString("Subjects");

            a.addRow(new Object[]{q});
        }
        JTableHeader th = jTable2.getTableHeader();
        TableColumnModel tcm = th.getColumnModel();
        TableColumn tc = tcm.getColumn(0);
        tc.setHeaderValue("Subjects");
        th.repaint();

        DefaultTableModel xa = (DefaultTableModel) jTable2.getModel();
        // int selectedRowIndex = jTable2.getSelectedRow();

        s1.setText(xa.getValueAt(0, 0).toString());
        s2.setText(xa.getValueAt(1, 0).toString());
        s3.setText(xa.getValueAt(2, 0).toString());
        s4.setText(xa.getValueAt(3, 0).toString());
        s5.setText(xa.getValueAt(4, 0).toString());
        s6.setText(xa.getValueAt(5, 0).toString());
        s7.setText(xa.getValueAt(6, 0).toString());
        s8.setText(xa.getValueAt(7, 0).toString());
        s9.setText(xa.getValueAt(8, 0).toString());
        s10.setText(xa.getValueAt(9, 0).toString());
        s11.setText(xa.getValueAt(10, 0).toString());
        s12.setText(xa.getValueAt(11, 0).toString());
        s13.setText(xa.getValueAt(12, 0).toString());
        s14.setText(xa.getValueAt(13, 0).toString());


    } catch (ClassNotFoundException ex) {
        Logger.getLogger(CBL.class.getName()).log(Level.SEVERE, null, ex);
    } catch (SQLException ex) {
        Logger.getLogger(CBL.class.getName()).log(Level.SEVERE, null, ex);
    }

每次运行代码时，总是会给出java.lang.ArrayIndexOutOfBoundsException: 7 >= 7错误。

Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: 7 >= 7
at java.util.Vector.elementAt(Vector.java:474)
at javax.swing.table.DefaultTableModel.getValueAt(DefaultTableModel.java:648)
at progress.chart.CBL.jSubjectActionPerformed(CBL.java:1750)
at progress.chart.CBL.access$1600(CBL.java:34)
at progress.chart.CBL$19.actionPerformed(CBL.java:1041)
at javax.swing.JComboBox.fireActionEvent(JComboBox.java:1258)
at javax.swing.JComboBox.setSelectedItem(JComboBox.java:586)
at javax.swing.JComboBox.setSelectedIndex(JComboBox.java:622)
at javax.swing.plaf.basic.BasicComboPopup$Handler.mouseReleased(BasicComboPopup.java:861)
at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:290)
at java.awt.Component.processMouseEvent(Component.java:6533)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3324)
at javax.swing.plaf.basic.BasicComboPopup$1.processMouseEvent(BasicComboPopup.java:510)
at java.awt.Component.processEvent(Component.java:6298)
at java.awt.Container.processEvent(Container.java:2236)
at java.awt.Component.dispatchEventImpl(Component.java:4889)
at java.awt.Container.dispatchEventImpl(Container.java:2294)
at java.awt.Component.dispatchEvent(Component.java:4711)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4888)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4525)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4466)
at java.awt.Container.dispatchEventImpl(Container.java:2280)
at java.awt.Window.dispatchEventImpl(Window.java:2746)
at java.awt.Component.dispatchEvent(Component.java:4711)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)
at java.awt.EventQueue.access$500(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:709)
at java.awt.EventQueue$3.run(EventQueue.java:703)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:90)
at java.awt.EventQueue$4.run(EventQueue.java:731)
at java.awt.EventQueue$4.run(EventQueue.java:729)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)

这是你们想要的完整的堆栈跟踪

Answer 1

看起来你在代码中犯了一个错误。方法调用DefaultTableModel.getValueAt(int row, int column)抛出一个异常，因为您的行数少于8行。我建议检查行数并在最后一行停止。在您的代码中，您期望有14行，但实际上您的行较少。

在评论中回答你的问题：

当我停留在s7.setText(xa.getValueAt(6，0).toString())时，它可以工作；那么如何增加数组中的7列呢？因为我想把它变成14甚至更多

1. 您在上面的while循环(a.addRow(new Object[]{q});)中只添加了7行。情况可能会发生变化，您可能会从数据库中得到较少或更多的行。
2. 我想这不是个好问题，因为看起来你问的是怎么写你的程序。此刻，我放弃了，因为我无法在不了解需求等情况下为您编写程序。谢谢您的理解。

Answer 2

DefaultTableModel看起来像一个数组对象，可能DefaultTableModel的数组长度在7下面。因此，当您放入这个数组7或更多对象时，就会出现ArrayIndexOutOfBoundsException错误。

因此，您需要检查DefaultTableModel对象数组长度。

Answer 3

很可能是在xa.getValueAt(7, 0) xa.getValueAt(8, 0).....中发现的异常，所以请按下面的行DefaultTableModel xa = (DefaultTableModel) jTable2.getModel();检查xa的大小