如何清除JTable中的选定单元格？

Question

我可以通过单击选择并设置焦点到JTable中的单元格，现在我想更改焦点单元格上的值。为了改变它的价值，我必须双击！是否可以通过单击来清除/更改该焦点单元格的值？

我尝试过jTable1.setValueAt("", row, column);，这会在后台清除值（在GUI中未更新/相同的旧值出现在单元格中），而且每次单击时都会清除该值。

表结构：

jTable1.addMouseListener(new MouseAdapter(){
    @Override
    public void mouseClicked(final MouseEvent e) {
        if (e.getClickCount()==1){
            final JTable jTable=(JTable)e.getSource();
            final int row = jTable.getSelectedRow();
            final int column = jTable.getSelectedColumn();
            jTable1.editCellAt(row,column);
            jTable1.getEditorComponent().requestFocus();
            final Double valueInCell = (Double)jTable.getValueAt(row, column);
            System.out.println(valueInCell);
        }
    }
});

Answer 1

如果您只想清除或更改一个保存String的JTable单元，为什么不简单地调用JTable的setValueAt(Object o, int row, int column)方法呢？要清除，请传入""，设置为其他值，然后传入其他String。

例如，我的minimal reproducible example：

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.event.*;
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();

   public TableFoo() {
      table.setFillsViewportHeight(true);
      fillTableData();
      MyMouse myMouse = new MyMouse();
      table.addMouseListener(myMouse);

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

   class MyMouse extends MouseAdapter {
       @Override
       public void mousePressed(final MouseEvent e) {
            final int row = table.getSelectedRow();
            final int column = table.getSelectedColumn();
            table.setValueAt("", row, column);
       }

   }

   public void fillTableData() {
      Vector<Vector<String>> matrix = new Vector<Vector<String>>();
      int rowCount = 8;
      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", i, j);
            row.add(rowText );
         }
         matrix.add(row);
      }
      DefaultTableModel model = new DefaultTableModel(matrix,
            COLUMN_NAME_VECTOR);
      table.setModel(model);
   }

   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();
         }
      });
   }
}