Java Swing JTable，从DefaultTableModel中删除行时发生异常

我编写了以下函数，可用于从DefaultTableModel中删除行：

private static void removeTableRows(JTable tableToClear){
    DefaultTableModel defaultModel = 
            (DefaultTableModel) tableToClear.getModel();
    int rows = defaultModel.getRowCount();

      while(rows>0) {
         defaultModel.removeRow(0);
      }
      String[] test = {"a","b","c"};
     defaultModel.addRow(test);
}

这将引发以下异常：

Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: 0 >= 0
    at java.util.Vector.elementAt(Vector.java:427)
    at javax.swing.table.DefaultTableModel.getValueAt(DefaultTableModel.java:632)
    at org.swx.nursing.tools.gui.DefaultTableGui$2.tableChanged(DefaultTableGui.java:217)
    at javax.swing.table.AbstractTableModel.fireTableChanged(AbstractTableModel.java:280)
    at javax.swing.table.AbstractTableModel.fireTableRowsDeleted(AbstractTableModel.java:245)
    at javax.swing.table.DefaultTableModel.removeRow(DefaultTableModel.java:447)
    at org.swx.nursing.tools.gui.DefaultTableGui.removeTableRows(DefaultTableGui.java:357)
    at org.swx.nursing.tools.gui.DefaultTableGui.actionPerformed(DefaultTableGui.java:330)
    at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
    at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
    at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
    at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
    at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236)
    at java.awt.Component.processMouseEvent(Component.java:6297)
    at javax.swing.JComponent.processMouseEvent(JComponent.java:3275)
    at java.awt.Component.processEvent(Component.java:6062)
    at java.awt.Container.processEvent(Container.java:2039)
    at java.awt.Component.dispatchEventImpl(Component.java:4660)
    at java.awt.Container.dispatchEventImpl(Container.java:2097)
    at java.awt.Component.dispatchEvent(Component.java:4488)
    at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4575)
    at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4236)
    at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4166)
    at java.awt.Container.dispatchEventImpl(Container.java:2083)
    at java.awt.Window.dispatchEventImpl(Window.java:2489)
    at java.awt.Component.dispatchEvent(Component.java:4488)
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:674)
    at java.awt.EventQueue.access$400(EventQueue.java:81)
    at java.awt.EventQueue$2.run(EventQueue.java:633)
    at java.awt.EventQueue$2.run(EventQueue.java:631)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
    at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:98)
    at java.awt.EventQueue$3.run(EventQueue.java:647)
    at java.awt.EventQueue$3.run(EventQueue.java:645)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:644)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)

tablechanged方法被覆盖，如下所示：

 //Add table cell listener
    model.addTableModelListener(new TableModelListener(){

        public void tableChanged(TableModelEvent e) {
             int row = e.getFirstRow();
             int col = e.getColumn();
             TableModel tableModel = (TableModel)e.getSource();
             Object data = null ;

             try{
                 data = tableModel.getValueAt(row, col);
             } catch (Exception ex) {
                 LOGGER.error("Failed to access table data: "+ex.getMessage());
             }

             boolean ishotKeyColEmpty = tableModel.getValueAt(row, 0).toString().isEmpty();
             boolean ishTypeColEmpty = tableModel.getValueAt(row, 2).toString().isEmpty();     
             /*
              * If the Application path column is empty, then clear the contents from
              * the hotKey and Type cells for this row 
              * 
              */
             if(data != null 
                     && data.toString().equals("") 
                     && !ishotKeyColEmpty 
                     && !ishTypeColEmpty) {
                 tableModel.setValueAt("", row, 0);
                 tableModel.setValueAt("", row, 2);
             }      
        }
    });

---

我不确定导致此异常的原因。

您的代码中有两个问题

1） 尝试从

modellistner

中的无现有行/列中获取值

2） 即使

removablerows

方法中没有更多行，也不停止连续删除行

---

---

让我先解释第二个错误

2）

在while循环中，您没有更新行计数。您正在获取行计数，但此while循环条件不会变为false。例如，您有3行，而在检查while循环时，计数现在为3（行>0）无论循环多长时间，它总是正确的，所以当循环第四次运行时，您会收到一个错误，因为没有更多的行要删除。你必须重新计算行数

将方法更改为

DefaultTableModel defaultModel= (DefaultTableModel) tableToClear.getModel();
int rows = defaultModel.getRowCount();
while (rows > 0) {
       defaultModel.removeRow(0);
       rows = defaultModel.getRowCount(); // this is very important
}
String[] test = {"a", "b", "c"};
defaultModel.addRow(test);

注:

您可以使用方法

defaultModel.RowCount（0）方法删除所有行。不需要使用循环

1）
确保row和col为0或大于0。因为当它们不存在时，它们可以是-1。那么您将得到很多错误

所以这条线很重要

 (row >= 0 && col >= 0){}

还有这里

boolean ishotKeyColEmpty = tableModel.getValueAt(row, 0).toString().isEmpty();

在调用之前，必须安全地检查
getValueAt（第0行）
是否不为null
toString（）.isEmpty（）
方法。
在你的

完整代码

addTableModelListener(new TableModelListener() {

            @Override
            public void tableChanged(TableModelEvent e) {

                int row = e.getFirstRow();
                int col = e.getColumn();
                TableModel tableModel = (TableModel) e.getSource();
                Object data = null;

                try {
                    if (row >= 0 && col >= 0) {
                        data = tableModel.getValueAt(row, col);

                        boolean ishotKeyColEmpty = false;
                        boolean ishTypeColEmpty = false;
                        if (tableModel.getValueAt(row, 0) != null) {
                            ishotKeyColEmpty = tableModel.getValueAt(row, 0).toString().isEmpty();
                        }
                        if (tableModel.getValueAt(row, 2) != null) {
                            ishTypeColEmpty = tableModel.getValueAt(row, 2).toString().isEmpty();
                        }

                        if (data != null && data.toString().equals("") && !ishotKeyColEmpty && !ishTypeColEmpty) {
                            tableModel.setValueAt("", row, 0);
                            tableModel.setValueAt("", row, 2);
                        }
                    }
                } catch (Exception ex) {
                    ex.printStackTrace();
                }

            }

        }

非常感谢你向我解释这一点…工作得很有魅力！（我已经尝试了很多方法来解决它：/）@Rookie很好。但是在之前的回答中我这边有一个问题。所以我更新了它。实际上，您应该检查模型列表中的
（row>=0&&col>=0）
。我更新了模型列表的代码让我先解释第二个错误将方法更改为==DefaultTableModel.setRowCount（0）重置所有..@mKorbel什么？我不明白为什么要避免XxxTableModel中的空值，我看不到任何有意义的方法