我需要从 .txt 文件中读取日期并将其放入 GUI 中的 JTable 中,然后修改一些记录或删除一些行并将新数据保存到文件中。 我可以读取并显示 JTable,但如何使用 GUI 编辑日期或删除 JTable 中的某些行,然后将其保存到文件中?
最佳答案
but how to edit
您需要重写 DefaultTableModel
的 isCellEditable(...)
方法以返回 true
。
delete some lines in JTable using GUI
您需要知道选择了哪一行,然后使用 DefaultTableModel
的 removeRow(...)
方法删除该行。
例如:
import java.awt.*;
import java.awt.event.*;
import java.util.Arrays;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import javax.swing.*;
import javax.swing.table.*;
public class ItemDeletion extends JPanel
{
private JList<String> list;
private JTable table;
public ItemDeletion()
{
setLayout( new BorderLayout(5, 5) );
String[] items =
{
"One",
"Two",
"Three",
"Four",
"Five",
"Six",
"Seven",
"Eight",
"Nine",
"Ten"
};
// Add the list
DefaultListModel<String> listModel = new DefaultListModel<String>();
for (String item: items)
listModel.addElement( item );
list = new JList<String>( listModel );
JButton listDelete = new JButton( "Delete From List" );
listDelete.addActionListener( new ActionListener()
{
@Override
public void actionPerformed(ActionEvent e)
{
DefaultListModel model = (DefaultListModel)list.getModel();
int row = list.getSelectedIndex();
while (row != -1)
{
model.removeElementAt( row );
row = list.getSelectedIndex();
}
}
});
JPanel listPanel = new JPanel( new BorderLayout(5, 5) );
listPanel.add(new JScrollPane( list ), BorderLayout.CENTER);
listPanel.add(listDelete, BorderLayout.PAGE_END);
// Add the table
DefaultTableModel tableModel = new DefaultTableModel(0, 1);
List<String> tableItems = Arrays.asList( items );
Collections.shuffle( tableItems );
for (String item: tableItems)
{
System.out.println( item );
tableModel.addRow( new String[]{item} );
}
table = new JTable( tableModel );
table.setAutoCreateRowSorter(true);
((DefaultRowSorter)table.getRowSorter()).toggleSortOrder(0);
JButton tableDelete = new JButton( "Delete From Table" );
tableDelete.addActionListener( new ActionListener()
{
@Override
public void actionPerformed(ActionEvent e)
{
DefaultTableModel model = (DefaultTableModel)table.getModel();
int row = table.getSelectedRow();
while (row != -1)
{
int modelRow = table.convertRowIndexToModel( row );
model.removeRow( modelRow );
row = table.getSelectedRow();
}
}
});
JPanel tablePanel = new JPanel( new BorderLayout(5, 5) );
tablePanel.add(new JScrollPane( table ), BorderLayout.CENTER);
tablePanel.add(tableDelete, BorderLayout.PAGE_END);
add(listPanel, BorderLayout.LINE_START);
add(tablePanel, BorderLayout.LINE_END);
}
private static void createAndShowGUI()
{
JFrame frame = new JFrame("Multiple Item Deletion");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new ItemDeletion(), BorderLayout.NORTH);
frame.setLocationByPlatform( true );
frame.pack();
frame.setVisible( true );
}
public static void main(String[] args)
{
EventQueue.invokeLater(new Runnable()
{
public void run()
{
createAndShowGUI();
}
});
}
}
save it to the file?
您需要从DefaultTableModel
获取数据。您可以使用 getValueAt(...)
方法来检索每个值。
因此您需要创建类似以下的代码:
for (each row);
{
StringBuilder sb = new StringBuilder();
for ( each column)
{
Object data = model.getValueAt(...);
sb.append( data.toString() );
}
write the sb.toString() to the file
}
关于java - 如何读取文件,将数据放入JTable中,然后修改单元格/删除行并将数据保存到文件中?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/37549704/