删除JTable行时，为什么会出现ArrayIndexOutOfBoundsException? [英] Why am I getting an ArrayIndexOutOfBoundsException when I delete JTable row?
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问题描述
当我尝试从JTable中删除一行时，我得到了.ArrayIndexOutOfBoundsException.
I am getting .ArrayIndexOutOfBoundsException when i try to delete a row from my JTable.
Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: -1
at java.util.Vector.elementData(Vector.java:734)
at java.util.Vector.elementAt(Vector.java:477)
at javax.swing.table.DefaultTableModel.getValueAt(DefaultTableModel.java:648)
at Test$1.valueChanged(Test.java:34)
at javax.swing.DefaultListSelectionModel.fireValueChanged(DefaultListSelectionModel.java:184)
at javax.swing.DefaultListSelectionModel.fireValueChanged(DefaultListSelectionModel.java:164)
at javax.swing.DefaultListSelectionModel.fireValueChanged(DefaultListSelectionModel.java:211)
at javax.swing.DefaultListSelectionModel.removeIndexInterval(DefaultListSelectionModel.java:677)
at javax.swing.JTable.tableRowsDeleted(JTable.java:4509)
at javax.swing.JTable.tableChanged(JTable.java:4412)
at javax.swing.table.AbstractTableModel.fireTableChanged(AbstractTableModel.java:296)
at javax.swing.table.AbstractTableModel.fireTableRowsDeleted(AbstractTableModel.java:261)
at javax.swing.table.DefaultTableModel.removeRow(DefaultTableModel.java:463)
at Test$2.actionPerformed(Test.java:39)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2348)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
首先，我选择要删除的行，然后在我执行操作时，删除按钮会冻结一段时间，并给我例外.
First, I select the row I want to delete and then when I fire the action the delete button it freezes a bit and gives me exception.
这是我完整的代码:
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.IOException;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JTextField;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
import javax.swing.table.DefaultTableModel;
public class Test extends JFrame{
private static JTable table;
private DefaultTableModel model = new DefaultTableModel();;
private JButton del = new JButton("DELETE");
public Test(){
JPanel pan= new JPanel();
JTextField numeField = new JTextField(30);
model.addColumn("Id");
model.addColumn("Nume");
table = new JTable(model);
JScrollPane pen = new JScrollPane(table);
del.setEnabled(false);
pan.add(pen);
pan.add(numeField);
pan.add(del);
table.getSelectionModel().addListSelectionListener(new ListSelectionListener(){
public void valueChanged(ListSelectionEvent e){
del.setEnabled(true);
numeField.setText(model.getValueAt(table.getSelectedRow(), 1).toString());
}
});
del.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
model.removeRow(table.getSelectedRow());
}
});
Object[] row = {"1","NAME"};
model.addRow(row);
add(pan);
setExtendedState(MAXIMIZED_BOTH);
setDefaultCloseOperation(DISPOSE_ON_CLOSE);
setVisible(true);
}
public static void main(String[] args) throws IOException {
new Test();
}
}
完整堆栈跟踪:
Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: -1
at java.util.Vector.elementData(Unknown Source)
at java.util.Vector.elementAt(Unknown Source)
at javax.swing.table.DefaultTableModel.getValueAt(Unknown Source)
at Test$1.valueChanged(Test.java:34)
at javax.swing.DefaultListSelectionModel.fireValueChanged(Unknown Source)
at javax.swing.DefaultListSelectionModel.fireValueChanged(Unknown Source)
at javax.swing.DefaultListSelectionModel.fireValueChanged(Unknown Source)
at javax.swing.DefaultListSelectionModel.removeIndexInterval(Unknown Source)
at javax.swing.JTable.tableRowsDeleted(Unknown Source)
at javax.swing.JTable.tableChanged(Unknown Source)
at javax.swing.table.AbstractTableModel.fireTableChanged(Unknown Source)
at javax.swing.table.AbstractTableModel.fireTableRowsDeleted(Unknown Source)
at javax.swing.table.DefaultTableModel.removeRow(Unknown Source)
at Test$2.actionPerformed(Test.java:39)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$500(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
推荐答案
问题不在ActionListener中，问题不在ListSelectionListener中；当您删除该行时，您要删除的行不再存在；如果要更改选定的行，则必须使用事件中新的选定行；可能是使用getFirstIndex().
The problem is not in the ActionListener, the problem is in the ListSelectionListener; when you delete the row, the row that you're deleting no longer exists; if you want to change the selected row, you have to use the new selected row from the event; probably by using getFirstIndex().
您还需要确保该行存在，以便在删除行时仍然有一个有效值可供选择.
You also need to ensure that the row exists, so that when you delete a row, there's still a valid value to select.
换句话说，将您的ListSelectionListener更改为此:
In other words, change your ListSelectionListener to this:
table.getSelectionModel().addListSelectionListener(new ListSelectionListener(){
public void valueChanged(ListSelectionEvent e){
int firstIndex = e.getFirstIndex();
if(firstIndex >= 0 && firstIndex < model.getRowCount()) {
del.setEnabled(true);
numeField.setText(model.getValueAt(firstIndex, 1).toString());
} else {
del.setEnabled(false);
}
}
});
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