如何在关闭框架和打开另一个框架时保存JFrame变量

import javax.swing.*;

public class Main {
    private static JFrame frame1;
    private static JFrame frame2;
    private static int frame1State;

    public static void main(String[] args) {
        // 创建第一个框架
        frame1 = new JFrame("Frame 1");
        frame1.setSize(300, 200);
        frame1.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        // 创建第二个框架
        frame2 = new JFrame("Frame 2");
        frame2.setSize(300, 200);
        frame2.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        // 关闭第一个框架时保存状态
        frame1.addWindowListener(new java.awt.event.WindowAdapter() {
            @Override
            public void windowClosing(java.awt.event.WindowEvent windowEvent) {
                frame1State = frame1.getState();
            }
        });

        // 打开第二个框架时加载状态
        frame2.addWindowListener(new java.awt.event.WindowAdapter() {
            @Override
            public void windowOpened(java.awt.event.WindowEvent windowEvent) {
                frame2.setState(frame1State);
            }
        });

        // 显示第一个框架
        frame1.setVisible(true);
    }
}