说明：  Java 来自于 Sun 公司的一个叫 Green 的项目，其原先的目的是为家用电子消费产 品开发一个分布式代码系统，这样就可以把 E-mail 发给电冰箱、电视机等家用电器， 对它们进行控制，和它们进行信息交流。
(Java comes from a project called Green of Sun Company. Its original purpose is to develop a distributed code system for household electronic consumer products, so that E-mail can be sent to refrigerators, televisions and other household appliances to control them and exchange information with them.)