将行插入 JTable 时出现重复值

发布于 2024-07-18 22:21:50 字数 384 浏览 4 评论 0原文

我在将行插入 JTable 时遇到问题，但我不知道问题是什么。

我确实这样做：

((DefaultTableModel)myJTable.getModel()).insertRow(0,webSiteDownloader.getWebSites().toArray());

webSiteDownloader 是一个具有 ArrayList 的对象。我可以调用 getWebSites 方法来获取该数组。

问题是，当我插入一行并添加第二行时，JTable 仅显示第一行，但重复两次。我说得够清楚吗？

谢谢：D

原文

I have problems on inserting rows into a JTable and I don't know what the problem is.

I do exactly like this:

((DefaultTableModel)myJTable.getModel()).insertRow(0,webSiteDownloader.getWebSites().toArray());

The webSiteDownloader is one object that have an ArrayList. I can get that array calling the method getWebSites.

The problem is that when I insert one row, adding the second one, the JTable only shows the first one, but repeated twice. Was I clear enough?

Thks :D

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樱花落人离去 2024-07-25 22:21:50

我会在黑暗中尝试一下，猜测您想要完成这样的事情：

DefaultTableModel dtm = (DefaultTableModel)myJTable.getModel();
for (MyRowObject row : webSiteDownloader.getWebSites()) {
  dtm.insertRow(0, row.toArray());
}

您使用 insertRow 而不是 addRow 是否有特殊原因？

另外，我真的很想建议您通过扩展 AbstractTableModel 来推出自己的特殊用途 TableModel。基本未经测试的示例：

public class MyTableModel extends AbstractTableModel
{
  protected List<MyObject> rows;

  public MyTableModel()
  {
    rows = new ArrayList<MyObject>();
  }

  public void add(MyObject obj)
  {
    rows.add(obj);
  }

  @Override
  public int getRowCount()
  {
    return rows.size();
  }

  @Override
  public int getColumnCount()
  {
    // This value will be constant, but generally you'd also
    // want to override getColumnName to return column names
    // from an array, and in that case you can return the length
    // of the array with column names instead
    return 2;
  }

  @Override
  public Object getValueAt(int row, int column)
  {
    MyObject obj = rows.get(row);

    // Change this to match your columns
    switch(column) {
      case 0: return obj.getId();
      case 1: return obj.getName();
    }

    return null;
  }
}

I'll take a shot into the dark and guess that you want to accomplish something like this:

DefaultTableModel dtm = (DefaultTableModel)myJTable.getModel();
for (MyRowObject row : webSiteDownloader.getWebSites()) {
  dtm.insertRow(0, row.toArray());
}

Is there a special reason that you're using insertRow instead of addRow?

Also, I'd really like to recommend that you roll your own special purpose TableModel by extending AbstractTableModel. Basic untested example:

public class MyTableModel extends AbstractTableModel
{
  protected List<MyObject> rows;

  public MyTableModel()
  {
    rows = new ArrayList<MyObject>();
  }

  public void add(MyObject obj)
  {
    rows.add(obj);
  }

  @Override
  public int getRowCount()
  {
    return rows.size();
  }

  @Override
  public int getColumnCount()
  {
    // This value will be constant, but generally you'd also
    // want to override getColumnName to return column names
    // from an array, and in that case you can return the length
    // of the array with column names instead
    return 2;
  }

  @Override
  public Object getValueAt(int row, int column)
  {
    MyObject obj = rows.get(row);

    // Change this to match your columns
    switch(column) {
      case 0: return obj.getId();
      case 1: return obj.getName();
    }

    return null;
  }
}

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