... do_cmd(tr);//驱动总线 virtual task pre_trans(ref axi_trans tr);//实现回调方法 if(……) begin//通过信号控制出现频率 ...
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程序员仍然需要了解SAX的基本原理(如什么是ContentHandler以及如何实现回调方法)，但是JAXP抽象出了很多这样的细节。
Programmers still had to know the rudiments of SAX (like what a ContentHandler was and how to implement callback methods), but JAXP abstracted away many of these details.
在ejb 3.0之前，必须在Bean类上实现回调方法，如ejbcreate ； bean类必须实现所有方法，无论是否使用它们。
Prior to ejb 3.0, you had to implement callback methods, such as ejbCreate , on the bean class; bean classes had to implement all the methods, whether they used them or not.
该文件提供在远程接口中定义的所有方法以及应用服务器所需的方法(例如回调方法)的实现。
This file provides an implementation of all the methods defined in the remote interface, in addition to methods required by the application server (for example, callback methods).
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