PKI CA体系采用(39)体系，通过一个证书签发中心为每个用户和服务器颁发一个证书，之后用户和服务器、用户和用户之间通过证书相互验证对方的合法性，其标准是能否用CA中心的(40)对个人证书和服务器证书进行解密，而CA中心的(40)存在于公开的CA根证书里。

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When we announced Java 2 Micro Edition(J2ME)a few years ago, we believed that Java had an important role to play in hand held devices. Some were(71)that Java would be small enough for such limited devices.

 But no(72), Java for the small device is a success. J2ME has emerged strongly in the wireless market. Java's portability and extensibility have brought about rapid(73)in this market.

 The success of Java beyond desktop computers is significant(74)developers. Java literacy is now more important than ever, as Java is used more and more to(75)a whole range of new computing devices--not only wireless handsets but also personal digital assistants, cameras, automobiles, home control, and so on.

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