我编写了以下函数，我可以使用它来删除DefaultTableModel中的行：
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);
}
抛出以下异常：
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：
//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..
答案 0 :(得分：3)
您的代码中存在2个问题。
1）尝试从modellistner。{/ p>中的现有行/列中获取值
2）即使没有更多行 - removeTableRows方法
让我先解释第二个错误。
在while循环中 2)你没有更新行计数。你正在获取行计数但是这个while循环条件永远不会变为false。例如，你有3行，现在计数是3而你正在检查循环(rows > 0)无论它循环多长时间总是如此，所以当第四次循环运行时出现错误，因为没有更多行要删除。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);
注意：
您可以使用方法defaultModel.RowCount(0);方法删除所有行。您不需要使用循环来执行此操作
1)确保row和col为0或者超过它。因为当它们不存在时它们可以是-1。然后你会遇到很多错误
所以这一行很重要
(row >= 0 && col >= 0){}
也在这里
boolean ishotKeyColEmpty = tableModel.getValueAt(row, 0).toString().isEmpty();
在调用之前，您必须安全地检查getValueAt(row, 0)是否为空
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();
}
}
}