Java Applet
问题描述：
如何制作小程序，应在组合框中显示国家列表.选择时应显示以下各个状态.每个国家应至少有三个州.组合框应为只读.
How to make an applet should have a list of countries in a combo box. when selected should dispaly respective states below. Each country should have atleast three states. Combo box should be read only.