class MyDisposableBean implements DisposableBean {

    // 模拟的数据库连接对象
    private String databaseConnection;

    public MyDisposableBean() {
        // 在构造函数中模拟建立数据库连接
        this.databaseConnection = "Database connection established";
        System.out.println(databaseConnection);
    }

    @Override
    public void destroy() throws Exception {<FILL_FUNCTION_BODY>}
}

        // 在 destroy 方法中模拟关闭数据库连接
        databaseConnection = null;
        System.out.println("Database connection closed");
    
<no_super_class>