2

JTableに行を動的に追加しようとしていますが、ArrayIndexOutOfBounds例外で苦労しています。問題が存在する理由と問題が発生する場所について具体的な説明がないため、私は混乱しています。コードについては、以下を参照してください。

ArrayList<ArrayList<String>> matrix = new ArrayList<ArrayList<String>>();
Object[][] data;

Random rand = new Random();

******************** WHEN PRESSING A BUTTON *****************************

matrix.add(new ArrayList<String>()); 
((ArrayList<String>)matrix.get(0)).add("row 0 col " + rand.nextInt(100) );
((ArrayList<String>)matrix.get(0)).add("row 0 col 1");
((ArrayList<String>)matrix.get(0)).add("row 0 col 2");
matrix.add(new ArrayList<String>()); 
((ArrayList<String>)matrix.get(1)).add("row 1 col 0");
((ArrayList<String>)matrix.get(1)).add("row 1 col 1");
((ArrayList<String>)matrix.get(1)).add("row 1 col 2");

data = new Object[matrix.size()][];

for(int i = 0; i < matrix.size(); i++){
    data[i] = matrix.get(i).toArray();
}

table = new JTable(data, new String[]{"A", "B", "C"});
table.setFillsViewportHeight(true);
table.setForeground(Color.WHITE);
table.setBackground(Color.BLACK);
table.setBounds(0, 0, 423, 91);

pnlTable.add(table);
pnlTable.setLayout(null);

table.updateUI();
System.out.println("done");

この問題は、ボタンを2回以上押した後にのみ発生します。テーブルを動的に空にして新しいデータを追加する方法を教えてもらえますか？

編集：エラーログは次のとおりです。

Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: 0
    at javax.swing.JTable$1.getValueAt(Unknown Source)
    at javax.swing.JTable.getValueAt(Unknown Source)
    at javax.swing.JTable.prepareRenderer(Unknown Source)
    at javax.swing.plaf.basic.BasicTableUI.paintCell(Unknown Source)
    at javax.swing.plaf.basic.BasicTableUI.paintCells(Unknown Source)
    at javax.swing.plaf.basic.BasicTableUI.paint(Unknown Source)
    at javax.swing.plaf.ComponentUI.update(Unknown Source)
    at javax.swing.JComponent.paintComponent(Unknown Source)
    at javax.swing.JComponent.paint(Unknown Source)
    at javax.swing.JComponent.paintToOffscreen(Unknown Source)
    at javax.swing.RepaintManager$PaintManager.paintDoubleBuffered(Unknown Source)
    at javax.swing.RepaintManager$PaintManager.paint(Unknown Source)
    at javax.swing.RepaintManager.paint(Unknown Source)
    at javax.swing.JComponent._paintImmediately(Unknown Source)
    at javax.swing.JComponent.paintImmediately(Unknown Source)
    at javax.swing.RepaintManager.paintDirtyRegions(Unknown Source)
    at javax.swing.RepaintManager.paintDirtyRegions(Unknown Source)
    at javax.swing.RepaintManager.prePaintDirtyRegions(Unknown Source)
    at javax.swing.RepaintManager.access$700(Unknown Source)
    at javax.swing.RepaintManager$ProcessingRunnable.run(Unknown Source)
    at java.awt.event.InvocationEvent.dispatch(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.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)
4

3 に答える 3

3

JTableの内容を変更するには、JTableを再作成しないでください。DefaultTableModelオブジェクトやAbstractTableModel拡張クラスオブジェクトなどの新しいTableModelを作成し、を介して新しいモデルでテーブルのモデルを設定するだけsetModel()です。

また、GUIのルックアンドフィールを変更しない限り、nullレイアウトを避け、updateUIを呼び出さないでください。

例えば、 

import java.awt.BorderLayout;
import java.awt.Color;
import java.util.Arrays;
import java.util.Vector;
import java.util.Random;

import javax.swing.*;
import javax.swing.table.DefaultTableModel;

@SuppressWarnings("serial")
public class TableFoo extends JPanel {
   private static final Vector<String> COLUMN_NAME_VECTOR = new Vector<String>(
         Arrays.asList(new String[] { "A", "B", "C" }));
   private static final int COLUMN_COUNT = COLUMN_NAME_VECTOR.size();
   private JTable table = new JTable();
   private Random rand = new Random();

   public TableFoo() {
      table.setFillsViewportHeight(true);
      table.setForeground(Color.WHITE);
      table.setBackground(Color.BLACK);

      JButton changeData = new JButton(new ChangeDataAction());
      JPanel southPanel = new JPanel();
      southPanel.setBackground(Color.black);
      southPanel.add(changeData);

      setLayout(new BorderLayout());
      add(new JScrollPane(table), BorderLayout.CENTER);
      add(southPanel, BorderLayout.PAGE_END);
   }

   public void changeTableData() {
      Vector<Vector<String>> matrix = new Vector<Vector<String>>();

      int rowCount = rand.nextInt(5) + 3;
      for (int i = 0; i < rowCount ; i++) {
         Vector<String> row = new Vector<String>();
         for (int j = 0; j < COLUMN_COUNT; j++) {
            String rowText = String.format("row %d col %d:   %d", i, j, rand.nextInt(100));
            row.add(rowText );
         }
         matrix.add(row);
      }

      DefaultTableModel model = new DefaultTableModel(matrix,
            COLUMN_NAME_VECTOR);

      table.setModel(model);
   }

   private class ChangeDataAction extends AbstractAction {
      public ChangeDataAction() {
         super("Change Action");
      }

      public void actionPerformed(java.awt.event.ActionEvent arg0) {
         changeTableData();
      };
   }

   private static void createAndShowGui() {
      TableFoo mainPanel = new TableFoo();

      JFrame frame = new JFrame("TableFoo");
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      frame.getContentPane().add(mainPanel);
      frame.pack();
      frame.setLocationByPlatform(true);
      frame.setVisible(true);
   }

   public static void main(String[] args) {
      SwingUtilities.invokeLater(new Runnable() {
         public void run() {
            createAndShowGui();
         }
      });
   }
}
于 2012-07-22T18:41:22.783 に答える
1

for (int i = model.getRowCount() - 1; i > -1; i--) {

  • その後、新しい要素をに追加しますXxxTableModel
于 2012-07-22T18:46:58.627 に答える
1

これを行う最も簡単な方法は、TableModelを使用することです。

DefaultTableModel model = (DefaultTableModel) this.yourTable.getModel();
model.setRowCount(0);

幸運を！

于 2013-11-03T01:14:19.533 に答える