java - JTable insertRow ArrayIndexOutOfBoundsException

Question

我试图在单击按钮后向表中插入一行，但收到​​下面的堆栈异常。

Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: 0 >= 0
    at java.util.Vector.elementAt(Unknown Source)
    at javax.swing.table.DefaultTableModel.justifyRows(Unknown Source)
    at javax.swing.table.DefaultTableModel.insertRow(Unknown Source)
    at com.testingarea.TestModel$2.actionPerformed(TestModel.java:64)
    at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
    at javax.swing.AbstractButton$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$200(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)

我已在下面创建了 SSCCE，以便您可以重新创建。我不完全确定为什么会发生这种情况，我认为这可能与我的模型有关？

package com.testingarea;

import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.EventQueue;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Vector;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.WindowConstants;
import javax.swing.table.DefaultTableModel;

public class TestModel {

  private DespatchTypeParameterTableModel _model = new DespatchTypeParameterTableModel();
  private JTable _table = new JTable(_model);

  public static void main(String... args) {
    EventQueue.invokeLater(new Runnable() {

      @Override
      public void run() {
        createAndShowGUI();
      }

    });
  }

  public static void createAndShowGUI() {
    JFrame frame = new JFrame();
    frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    frame.getContentPane().add(new TestModel().makeUI());
    frame.setSize(800, 600);
    frame.setLocationRelativeTo(null);
    frame.setVisible(true);
  }

  private Component makeUI() {
    JPanel p = new JPanel(new BorderLayout());
    p.add(new JScrollPane(_table), BorderLayout.NORTH);
    p.add(createButtonPanel(), BorderLayout.SOUTH);
    return p;
  }

  private Component createButtonPanel() {
    JPanel buttonPanel = new JPanel(new FlowLayout(FlowLayout.RIGHT, 5, 5));
    JButton insertButton = new JButton("Insert Despatch Type Parameter");
    insertButton.addActionListener(new ActionListener() {

      @SuppressWarnings("rawtypes")
      @Override
      public void actionPerformed(ActionEvent event) {
        int lastSelectedRow = _table.getSelectionModel().getMaxSelectionIndex();
        int realRow = lastSelectedRow;
        Vector vector = new Vector();
        _table.clearSelection();
        if (lastSelectedRow == -1) {
          ((DefaultTableModel)_model).insertRow(_table.getRowCount(), vector);
          _model.addDespatchTypeParameter(new DespatchTypeParameter("Test Name", "Test Description", "Test Value"));
          _table.getSelectionModel().setSelectionInterval(_table.getRowCount() - 1,
            _table.getRowCount() - 1);
        } else {
          ((DefaultTableModel)_model).insertRow(realRow + 1, vector);
          _model.addDespatchTypeParameter(new DespatchTypeParameter("Test Name", "Test Description", "Test Value"));
          _table.getSelectionModel().setSelectionInterval(realRow + 1, realRow + 1);
        }
      }

    });
    buttonPanel.add(insertButton);
    return buttonPanel;
  }

  @SuppressWarnings("serial")
  private static final class DespatchTypeParameterTableModel extends DefaultTableModel {

    private Vector<DespatchTypeParameter> _dtParameterList;

    public DespatchTypeParameterTableModel() {
      setColumnIdentifiers(new String[]{"Parameter Name", "Parameter Description", "Parameter Value"});
      _dtParameterList = new Vector<DespatchTypeParameter>();
    }

    @Override
    public int getRowCount() {
      return _dtParameterList == null ? 0 : _dtParameterList.size();
    }

    @Override
    public boolean isCellEditable(int row, int column) {
      return false;
    }

    @Override
    public Object getValueAt(int row, int column) {
      Object value = null;
      DespatchTypeParameter dtParameter = getDespatchTypeParameter(row);
      if (getColumnName(column).equals("Parameter Name")){
        value = dtParameter.getParameterName();
      }else if (getColumnName(column).equals("Parameter Description")){
        value = dtParameter.getParameterDescription();
      }else if (getColumnName(column).equals("Parameter Value")){
        value = dtParameter.getParameterValue();
      }
      return value;
    }

    public DespatchTypeParameter getDespatchTypeParameter(int row){
      if (row < 0 || row >= _dtParameterList.size()){
        return null;
      }
      return (DespatchTypeParameter)_dtParameterList.get(row);
    }

    public void addDespatchTypeParameter(DespatchTypeParameter despatchTypeParameter) {
      if (despatchTypeParameter != null){
        _dtParameterList.add(despatchTypeParameter);
        fireTableRowsInserted(_dtParameterList.size() - 1, _dtParameterList.size() - 1);
      }
    }

    @Override
    public void removeRow(int row) {
      if (row >= 0 && row < _dtParameterList.size()){
        _dtParameterList.remove(row);
        fireTableRowsDeleted(row, row);
      }
    }

    @Override
    public Vector<DespatchTypeParameter> getDataVector() {
      return _dtParameterList;
    }

  }

  private static class DespatchTypeParameter {
    private String _parameterName;
    private String _parameterDescription;
    private String _parameterValue;

    public DespatchTypeParameter(String parameterName, String parameterDescription, String parameterValue) {
      _parameterName = parameterName;
      _parameterDescription = parameterDescription;
      _parameterValue = parameterValue;
    }

    public String getParameterName() {
      return _parameterName;
    }

    public String getParameterDescription() {
      return _parameterDescription;
    }

    public String getParameterValue() {
      return _parameterValue;
    }
  }

}

Answer 1

我似乎已经通过删除来修复它

   @Override
    public int getRowCount() {
      return _dtParameterList == null ? 0 : _dtParameterList.size();
    }