在Jtable单元格内使用JcheckBoxes呈现JPanel。现在面板不能对齐到Jtable中单元格的中心

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

public class CheckBoxPanelRenderer extends DefaultTableCellRenderer {
    private JPanel panel;
    private JCheckBox checkBox1;
    private JCheckBox checkBox2;

    public CheckBoxPanelRenderer() {
        panel = new JPanel();
        checkBox1 = new JCheckBox("Option 1");
        checkBox2 = new JCheckBox("Option 2");

        panel.setLayout(new FlowLayout(FlowLayout.CENTER));
        panel.add(checkBox1);
        panel.add(checkBox2);
    }

    @Override
    public Component getTableCellRendererComponent(JTable table, Object value,
                                                   boolean isSelected, boolean hasFocus, int row, int column) {
        // 设置选中状态
        checkBox1.setSelected(((Boolean) value).booleanValue());
        checkBox2.setSelected(((Boolean) value).booleanValue());

        // 返回面板作为渲染组件
        return panel;
    }
}

// 获取表格列模型
TableColumnModel columnModel = table.getColumnModel();
// 获取需要设置渲染器的列索引
int columnIndex = 0; // 假设需要设置第一列的渲染器
// 创建并设置自定义渲染器
CheckBoxPanelRenderer renderer = new CheckBoxPanelRenderer();
columnModel.getColumn(columnIndex).setCellRenderer(renderer);