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关键词： Java   VB   网络课件  

摘要： 首先介绍了《VB程序设计》课程网络课件的系统框架设计,接着讨论了利用Java技术来开发的设计方法,最后分析了该课件使用后的良好效果。

关键词： transactions   feedback optimization   multiprocessor architecture  

摘要： Parallel programming is difficult due to the complexity of dealing with conventional lock-based synchronization. To simplify parallel programming, there have been a number of proposals to support transactions directly in hardware and eliminate locks completely. Although hardware support for transactions has the potential to completely change the way parallel programs are written, initially transactions will be used to execute existing parallel programs. In this paper we investigate the implications of using transactions to execute existing parallel Java programs. Our results show that transactions can be used to support all aspects of Java multithreaded programs, and once Java virtual machine issues have been addressed, the conversion of a lock-based application into transactions is largely straightforward. The performance that these converted applications achieve is equal to or sometimes better than the original lock-based implementation. (c) 2006 Elsevier B.V. All rights reserved.

关键词： Java游戏   程序安装   手机   Java程序  

摘要： Java程序最广泛的应用就是Java游戏,网络上有很多的论坛都提供大最的Java游戏下载,我们只需把Java游戏下载到本地,然后再传送到手机上。

关键词： program slicing   dynamic slicing   program dependence graph   debugging   object-oriented program   multithreading Java   distributed programming  

摘要： We propose a novel dynamic slicing technique for distributed Java programs. We first construct the intermediate representation of a distributed Java program in the form of a set of Distributed program Dependence Graphs (DPDG). We mark and unmark the edges of the DPDG appropriately as and when dependencies arise and cease during run-time. Our algorithm can run parallely on a network of computers, with each node in the network contributing to the dynamic slice in a fully distributed fashion. Our approach does not require any trace files to be maintained. Another advantage of our approach is that a slice is available even before a request for a slice is made. This appreciably reduces the response time of slicing commands. We have implemented the algorithm in a distributed environment. The results obtained from our experiments show promise. (C) 2006 Elsevier Inc. All rights reserved.

关键词： Java类文件   运行异常   依赖分析  

摘要： 提出一种基于类文件的Java运行时异常分析技术。它可在没有Java源代码文件的情况下,直接对类文件进行处理,分析可能抛出的异常信息,并根据分析结果在类文件中添加适当的异常追踪代码。这种处理后的类文件可无缝替换原类文件运行,并在运行中抛出异常时,能够给出详尽的异常分析报告,从而提高技术人员调试和开发的效率。

关键词： NMR viewer   Java   one dimensional   two dimensional  

摘要： Two Java applets, which allow viewing and simple reprocessing operations of one- and two-dimensional NMR spectra from within a web page, are described. For the 1D viewer, phasing, integration, peak picking and referencing are supported. Bruker, Varian and JCAMP-DX processed data files can be opened. The 2D viewer allows f2 phasing and referencing, and can read native Bruker processed data. The compiled applets are available from the author on request. Copyright (c) 2006 John Wiley & Sons, Ltd.

关键词： algorithms   design   multithreading   data dependence   interference dependence   context-sensitivity   strongly connected regions   program slicing  

摘要： Slicing is a well-known program reduction technique where for a given program P and a variable of interest v at some statement p in the program, a program slice contains those set of statements belonging to P that affect v. This article presents two algorithms for interprocedural slicing of concurrent programs -a context-insensitive algorithm and a context-sensitive algorithm. The context-insensitive algorithm is efficient and correct ( it includes every statement that may affect the slicing criterion) but is imprecise since it may include certain extra statements that are unnecessary. Precise slicing has been shown to be undecidable for concurrent programs. However, the context-sensitive algorithm computes correct and reasonably precise slices, but has a worst-case exponential-time complexity. Our context-sensitive algorithm computes a closure of dependencies while ensuring that statements sliced in each thread belong to a realizable path in that thread. A realizable path in a thread with procedure calls is one that reflects the fact that when a procedure finishes, execution returns to the site of the most recently executed call in that thread. One of the novelties of this article is a practical solution to determine whether a given set of statements in a thread may belong to a realizable path. This solution is precise even in the presence of recursion and long call chains in the flow graph. The slicing algorithms are applicable to concurrent programs with shared memory, interleaving semantics, explicit wait/notify synchronization and monitors. We first give a solution for a simple model of concurrency and later show how to extend the solution to the Java concurrency model. We have implemented the algorithms for Java bytecode and give experimental results.

关键词： 网络应用程序   网络通信   阻塞   非阻塞   Java  

摘要： 传统的网络应用程序主要使用阻塞方式进行网络通信,性能低下。虽然可使用多线程技术进行改进,但并不能从根本上解决阻塞通信带来的低效率问题。在Java 1.4中引入的NIO(新I/O)API,可实现非阻塞的I/O操作,从而实现流畅的网络通信,开发出高性能的网络应用程序。文中对比了两种不同的网络通信方式,给出了基于非阻塞I/O开发高性能网络应用程序的具体实例。

关键词： Java   TCP/IP   RMI   Stub   Skeleton  

摘要： 本文首先介绍了编写网络应用程序的三种方法,然后重点介绍了RMI技术,对基于RMI的JAVA应用程序的开发作了相关说明,并且给出了相应源程序。

关键词： WebGIS   Internet   Intranet   BS结构   Java   多线程   动画  

摘要： 本文在对WebGIS的概念、发展以及使用Java开发环境开发3层结构的WebGIS在浏览器方面的优势进行介绍之后,重点描述了Java语言中多线程技术的特点,讨论了Java多线程技术在We-bGIS客户端数据调度、数据传输、数据展示方面的体会。