当我尝试从JTable中删除一行时,我得到Connection
。
.ArrayIndexOutOfBoundsException
首先,我选择要删除的行,然后当我触发操作时,删除按钮会冻结一点并给我异常。
这是我的完整代码:
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)
完整堆栈跟踪:
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();
}
}
答案 0 :(得分:2)
问题不在ActionListener
,问题出在ListSelectionListener
;删除行时,您删除的行不再存在;如果要更改选定的行,则必须使用事件中新选择的行;可能是使用getFirstIndex()
。
您还需要确保该行存在,以便在删除行时,仍然有一个有效的值可供选择。
换句话说,将ListSelectionListener
更改为:
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);
}
}
});