在不先单击的情况下获取要在JTable中显示的JComboBox

import javax.swing.*;
import javax.swing.table.DefaultTableCellRenderer;
import java.awt.*;

public class ComboBoxTableCellRenderer extends DefaultTableCellRenderer {
    private JComboBox comboBox;

    public ComboBoxTableCellRenderer(JComboBox comboBox) {
        this.comboBox = comboBox;
    }

    @Override
    public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
        comboBox.setSelectedItem(value);
        return comboBox;
    }
}

JTable table = new JTable(data, columnNames);
TableColumn comboBoxColumn = table.getColumnModel().getColumn(columnIndex);
comboBoxColumn.setCellRenderer(new ComboBoxTableCellRenderer(comboBox));