使用j2me实现二级菜单，有利于页面的扩展，有利于开发-Use j2me to achieve the secondary menu is conducive to the expansion of the page and is conducive to the development of

J2ME中的一个简单二级菜单代码，非常适合新手学习。-J2ME in a simple two menu codes, is very suitable for novices to learn.