焦点问题使用JComboBox作为JTable中的单元格编辑器

import javax.swing.*;
import javax.swing.table.DefaultCellEditor;
import javax.swing.table.TableColumn;

public class JTableComboBoxExample {
    public static void main(String[] args) {
        JFrame frame = new JFrame("JTable ComboBox Example");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        // Create a table with two columns
        Object[][] data = {
                {"A", "B"},
                {"C", "D"}
        };
        String[] columnNames = {"Column 1", "Column 2"};
        JTable table = new JTable(data, columnNames);

        // Create a combo box with values to use as the editor for the first column
        JComboBox<String> comboBox = new JComboBox<>();
        comboBox.addItem("E");
        comboBox.addItem("F");
        comboBox.addItem("G");

        // Set the combo box as the editor for the first column
        TableColumn column = table.getColumnModel().getColumn(0);
        column.setCellEditor(new DefaultCellEditor(comboBox));

        // Add the table to the frame
        frame.add(new JScrollPane(table));
        frame.setSize(400, 200);
        frame.setVisible(true);
    }
}