java - JTable 删除行给出 ArrayOutofBounds 异常 -1

Question

我一直在浏览很多关于这个的网站，并尝试了一些不同的东西，但我被难住了。将不胜感激一些帮助。条件正常，检查是否选中了一个复选框(真)，但是当我执行 model.removeRow(row) 时，它会给我这个错误。

public class ExpenditurePanel extends JPanel implements TableModelListener{

private static final long serialVersionUID = 1L;
private static TableModel1 model;
private JTable table;

public ExpenditurePanel() {
    model = new TableModel1();
    table = new JTable(model);
    table.setBorder(new BevelBorder(BevelBorder.LOWERED, null, null, null, null));
    table.setRowSelectionAllowed(false);
    table.setFillsViewportHeight(true);
    table.setCellSelectionEnabled(true);
    table.setColumnSelectionAllowed(false);

    model.addColumn("Name");
    model.addColumn("Week");
    model.addColumn("Fortnight");
    model.addColumn("Month");
    model.addColumn("Year");
    model.addColumn("Remove");

    Object[] default1 = {"Accomodation","","","","",false};
    Object[] default2 = {"Food","","","","",false};

    model.addRow(default1);
    model.addRow(default2);

    model.addTableModelListener(this);

    this.add(new JScrollPane(table));
    table.setRowSorter(null);

}

public static TableModel1 getModel(){
    return model;
}

@Override
public void tableChanged(TableModelEvent e) {
    int row = e.getFirstRow();
    int column = e.getColumn();
    model = (TableModel1) e.getSource();
    String columnName = model.getColumnName(column);
    Object data = model.getValueAt(row, column);

    if(model.getValueAt(row,column) == Boolean.TRUE){
        System.out.println("Condition working");

        //this part keeps giving me error.
        model.removeRow(row);
    }
}
}

这是它抛出的内容:

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 studentBudget.ExpenditurePanel.tableChanged(ExpenditurePanel.java:53)
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 studentBudget.ExpenditurePanel.tableChanged(ExpenditurePanel.java:59)
at javax.swing.table.AbstractTableModel.fireTableChanged(Unknown Source)
at javax.swing.table.AbstractTableModel.fireTableCellUpdated(Unknown Source)
at javax.swing.table.DefaultTableModel.setValueAt(Unknown Source)
at javax.swing.JTable.setValueAt(Unknown Source)
at javax.swing.JTable.editingStopped(Unknown Source)
at javax.swing.AbstractCellEditor.fireEditingStopped(Unknown Source)
at javax.swing.DefaultCellEditor$EditorDelegate.stopCellEditing(Unknown Source)
at javax.swing.DefaultCellEditor.stopCellEditing(Unknown Source)
at javax.swing.DefaultCellEditor$EditorDelegate.actionPerformed(Unknown Source)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.JToggleButton$ToggleButtonModel.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 javax.swing.plaf.basic.BasicTableUI$Handler.repostEvent(Unknown Source)
at javax.swing.plaf.basic.BasicTableUI$Handler.mouseReleased(Unknown Source)
at java.awt.AWTEventMulticaster.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$000(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$1.doIntersectionPrivilege(Unknown Source)
at java.security.ProtectionDomain$1.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$1.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)

Answer 1

您正在更改 TableModelListener 内部的 TableModel，这对我来说似乎有点冒险，并且存在不必要的递归风险。如果可能的话，我会重构你的代码，以免这样做。如果你仍然卡住了，那么你应该创建并发布一个 sscce .

---

编辑 1

如果我做一个 sscce从您的代码中添加 println 语句:

import javax.swing.*;
import javax.swing.border.BevelBorder;
import javax.swing.event.*;
import javax.swing.table.*;

public class ExpenditurePanel extends JPanel implements TableModelListener {

   private static final long serialVersionUID = 1L;
   private static TableModel1 model;
   private JTable table;

   public ExpenditurePanel() {
      model = new TableModel1();
      table = new JTable(model);
      table.setBorder(new BevelBorder(BevelBorder.LOWERED, null, null, null,
            null));
      table.setRowSelectionAllowed(false);
      table.setFillsViewportHeight(true);
      table.setCellSelectionEnabled(true);
      table.setColumnSelectionAllowed(false);

      model.addColumn("Name");
      model.addColumn("Week");
      model.addColumn("Fortnight");
      model.addColumn("Month");
      model.addColumn("Year");
      model.addColumn("Remove");

      Object[] default1 = { "Accomodation", "", "", "", "", false };
      Object[] default2 = { "Food", "", "", "", "", false };

      model.addRow(default1);
      model.addRow(default2);

      model.addTableModelListener(this);

      this.add(new JScrollPane(table));
      table.setRowSorter(null);

   }

   public static TableModel1 getModel() {
      return model;
   }

   @Override
   public void tableChanged(TableModelEvent e) {
      int row = e.getFirstRow();
      int column = e.getColumn();

      // **** printf added below
      System.out.printf("[row: %d, column: %d]%n", row, column);

      model = (TableModel1) e.getSource();

      String columnName = model.getColumnName(column);

      // **** println added below
      System.out.println("columnName: " + columnName);

      Object data = model.getValueAt(row, column);

      if (model.getValueAt(row, column) == Boolean.TRUE) {
         System.out.println("Condition working");

         // *** AIOOBE called here
         model.removeRow(row);
      }
   }

   public static void main(String[] args) {
      SwingUtilities.invokeLater(new Runnable() {
         public void run() {
            ExpenditurePanel panel = new ExpenditurePanel();
            JFrame frame = new JFrame("foo");
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            frame.getContentPane().add(panel);
            frame.setLocationRelativeTo(null);
            frame.pack();
            frame.setVisible(true);
         }
      });
   }
}

// **** no idea how close this is to your code *****
class TableModel1 extends DefaultTableModel {
   @Override
   public Class<?> getColumnClass(int columnIndex) {
      if (getRowCount() == 0) {
         return super.getColumnClass(columnIndex);
      }
      Object value = getValueAt(0, columnIndex);
      if (value == null) {
         return super.getColumnClass(columnIndex);
      }

      return value.getClass();
   }
}

---

我得到这个输出:

[row: 0, column: 5]
columnName: Remove
Condition working
[row: 0, column: -1]
columnName: 
Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: -1
    at java.util.Vector.elementAt(Unknown Source)
    ...... etc ......

所以您看到模型监听器的 tableChanged(...) 方法被调用两次，这是由于将监听器更改为监听器内部的对象，第二次调用它时，它有一列 -1，这会导致抛出 AIOOBE。

---

编辑2
一个潜在的解决方案是在对模型进行更改之前删除监听器，然后在进行更改后重新添加监听器:

public void tableChanged(TableModelEvent e) {
  int row = e.getFirstRow();
  int column = e.getColumn();
  System.out.printf("[row: %d, column: %d]%n", row, column);
  model = (TableModel1) e.getSource();
  String columnName = model.getColumnName(column);
  System.out.println("columnName: " + columnName);
  Object data = model.getValueAt(row, column);

  if (model.getValueAt(row, column) == Boolean.TRUE) {
     System.out.println("Condition working");

     model.removeTableModelListener(this);
     model.removeRow(row);
     model.addTableModelListener(this);
  }
}