如何在JOptionPane.showInputDialog中编辑按钮位置？

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

public class CustomOptionPane extends JOptionPane {
    @Override
    protected int createButtonArea(int buttonsNeeded, int defaultButton) {
        JPanel buttonPanel = new JPanel(new FlowLayout(FlowLayout.CENTER)); // 使用FlowLayout布局管理器，将按钮居中显示

        for (int i = 0; i < buttonsNeeded; i++) {
            JButton button = new JButton(getButtonLabel(i));
            buttonPanel.add(button);
            if (i == defaultButton) {
                buttonPanel.getRootPane().setDefaultButton(button);
                button.requestFocus();
            }
        }

        add(buttonPanel, BorderLayout.SOUTH); // 将按钮区域添加到对话框的南部

        return buttonsNeeded;
    }

    public static void main(String[] args) {
        CustomOptionPane optionPane = new CustomOptionPane();
        String input = optionPane.showInputDialog(null, "请输入内容：", "输入对话框", JOptionPane.PLAIN_MESSAGE);
        System.out.println("输入内容：" + input);
    }
}