当我尝试从 java 中的表中删除行时,我遇到了一些问题。特别是,我使用 DefaultTableModel
,当我尝试使用 removeRow(int row)
方法删除一行时,最后一行将被删除,无论 row
是什么。例如,假设我们有六行。当调用 removeRow(0)
或 removeRow(2)
或 removeRow(5)
时,最后一行始终会被删除。知道为什么会发生这种情况吗?
谢谢
---更新
当按下 jtable 的特定单元格时,应删除相应的行。
class TagsTableMA extends MouseAdapter {
@Override
public void mousePressed(MouseEvent e){
Point p = e.getPoint();
int row = tagsJT.rowAtPoint(p);
int column = tagsJT.columnAtPoint(p);
if (column == COLUMN_DELETE_TAG){
DocDialog docDialog = new DocDialog(parentMainJF,
true,
null,
"Please confirm...",
"Are you sure you want to delete the \"" +
tagsJT.getValueAt(row, COLUMN_TAG_NAME) +
"\" tag?",
DocDialog.TYPE_YES_NO);
docDialog.show();
int answer = docDialog.getAnswer();
if (answer == DocDialog.YES)
model.removeRow(row);
}
}
}
---更新2号 这是我的问题的一些代码。我删除了一些不相关的内容。
import java.awt.Point;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.JFrame;
import javax.swing.JTable;
import javax.swing.table.DefaultTableModel;
public class MainJF extends JFrame {
public MainJF(){
this.add(createTagsTable());
setMinimumSize(new java.awt.Dimension(200,400));
}
private JTable createTagsTable(){
String[] columnNames = {"",
"Tag",
"",
"",
""};
Object[][] data = new Object[10][columnNames.length];
for (int i=0; i<data.length; i++){
data[i][COLUMN_CHECK] = false;
data[i][COLUMN_TAG_NAME] = "Tag " + i;
data[i][COLUMN_TAG_ID] = i;
data[i][COLUMN_EDIT_TAG] = "edit";
data[i][COLUMN_DELETE_TAG] = "delete";
}
model = new TagsSelectionTableModel(columnNames, data);
tagsJT = new JTable(model);
tagsJT.setRowSelectionAllowed(true);
tagsJT.addMouseListener(new TagsTableMA());
return tagsJT;
}
class TagsSelectionTableModel extends DefaultTableModel{
public TagsSelectionTableModel(String[] columnNames, Object[][] data){
super(data, columnNames);
this.columnNames = columnNames;
this.data = data;
}
private String[] columnNames;
private Object[][] data;
@Override
public Object getValueAt(int row, int col) { return data[row][col]; }
}
class TagsTableMA extends MouseAdapter{
@Override
public void mousePressed(MouseEvent e){
Point p = e.getPoint();
int row = tagsJT.rowAtPoint(p);
int column = tagsJT.columnAtPoint(p);
if (column == COLUMN_DELETE_TAG){
int irow = tagsJT.convertRowIndexToView(row);
model.removeRow(irow);
}
}
}
private JTable tagsJT;
private TagsSelectionTableModel model;
private static int COLUMN_CHECK = 0;
private static int COLUMN_TAG_NAME = 1;
private static int COLUMN_TAG_ID = 2;
private static int COLUMN_EDIT_TAG = 3;
private static int COLUMN_DELETE_TAG = 4;
public static void main(String args[]) {
new MainJF().setVisible(true);
}
}
最佳答案
从 columnAtPoint()
获取的 row
位于 view 坐标中,而 removeRow()
则采用 model 坐标。引用相关tutorial section :
This distinction does not matter unless your viewed data has been rearranged by sorting, filtering, or user manipulation of columns.
如果是这样,您将需要使用 convertRowIndexToModel()
,如 Sorting and Filtering 末尾处所述。 ,建议:
When using a sorter, always remember to translate cell coordinates.
此外,请考虑使用 ListSelectionListener
而不是 MouseAdapter
。
附录:您的 getValueAt()
实现继续访问提供给构造函数的数组,而模型的数据实际上存储在父实现中。如果您确实需要对模型的数据结构进行更多控制,请扩展 AbstractTableModel
,如下所示 here .
import java.awt.EventQueue;
import java.awt.Point;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.DefaultTableModel;
/** @see https://stackoverflow.com/a/11237205/230513 */
public class MainJF extends JFrame {
private JTable tagsJT;
private TagsSelectionTableModel model;
private static int COLUMN_CHECK = 0;
private static int COLUMN_TAG_NAME = 1;
private static int COLUMN_TAG_ID = 2;
private static int COLUMN_EDIT_TAG = 3;
private static int COLUMN_DELETE_TAG = 4;
public MainJF() {
this.add(new JScrollPane(createTagsTable()));
pack();
setLocationRelativeTo(null);
setDefaultCloseOperation(EXIT_ON_CLOSE);
}
private JTable createTagsTable() {
String[] columnNames = {"0", "Tag", "2", "3", "4"};
Object[][] data = new Object[10][columnNames.length];
for (int i = 0; i < data.length; i++) {
data[i][COLUMN_CHECK] = false;
data[i][COLUMN_TAG_NAME] = "Tag " + i;
data[i][COLUMN_TAG_ID] = i;
data[i][COLUMN_EDIT_TAG] = "edit";
data[i][COLUMN_DELETE_TAG] = "delete";
}
model = new TagsSelectionTableModel(columnNames, data);
tagsJT = new JTable(model);
tagsJT.setRowSelectionAllowed(true);
tagsJT.addMouseListener(new TagsTableMA());
return tagsJT;
}
class TagsSelectionTableModel extends DefaultTableModel {
public TagsSelectionTableModel(String[] columnNames, Object[][] data) {
super(data, columnNames);
}
}
class TagsTableMA extends MouseAdapter {
@Override
public void mousePressed(MouseEvent e) {
Point p = e.getPoint();
int row = tagsJT.rowAtPoint(p);
int col = tagsJT.columnAtPoint(p);
if (col == COLUMN_DELETE_TAG) {
model.removeRow(row);
}
}
}
public static void main(String args[]) {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
new MainJF().setVisible(true);
}
});
}
}
关于java - 无论索引如何,最后一行始终从 DefaultTableModel 中删除,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/39466544/