浅谈Java自定义异常在教学中的教与学

本文主要阐述Java自定义异常为消除错误,编写健壮代码,开发可靠的软件系统,提供重要保障,讨论如何编写自定义异常以及异常抛出、异常捕获、异常处理的规范和原则,并探讨在教学实施中的模式及经验效果。     

Java异常处理机制及应用

异常处理机制是Java语言的一大特色。从异常处理的机制、异常处理的方法、异常处理的原则等方面介绍Java语言的异常处理技术,分析了抛出异常和捕获异常的实际应用及注意事项,以便更好地利用异常处理机制解决实际问题。     

论异常与异常处理机制

异常处理是代替error code方法的新方法,它分离了接收和处理错误代码。它帮助理清了编程者的思绪,也增强了代码的可读性,方便了维护者的阅读和理解。异常处理机制还提供了处理程序运行时出现的任何意外或异常情况的方法,它包括尝试可能未成功的操作,处理失败,以及在事后清理资源。本文针对多种语言,尤其是C++和Java语言中的异常处理机制进行了讨论,对异常的调用原理进行了简单的分析。     

论异常与异常处理机制

异常处理是代替error code方法的新方法,它分离了接收和处理错误代码。它帮助理清了编程者的思绪,也增强了代码的可读性,方便了维护者的阅读和理解。异常处理机制还提供了处理程序运行时出现的任何意外或异常情况的方法,它包括尝试可能未成功的操作,处理失败,以及在事后清理资源。本文针对多种语言,尤其是C++和Java语言中的异常处理机制进行了讨论,对异常的调用原理进行了简单的分析。     

Java异常处理机制的研究

异常处理是Java语言的重要语言机制，正确、合理地处理异常对程序的可靠性、健壮性是十分重要的。在分析了异常处理技术的概念和思想后，对异常处理提出了指导原则，并针对检查型异常和非检查型异常的差异，探讨了对应的解决措施。     

Java异常处理与自定义异常

Java程序运行期间发生的错误称为异常.异常产生后,应有相应的异常处理机制来捕获异常或抛出异常。JDK平台为我们提供了丰富和完整的异常类,通过它们来处理程序运行中的错误,防止错误对程序造成影响,确保程序能够安全运行。当这些异常类不能捕获实际应用中的异常时．就需要用户自定义异常。异常处理和用户自定义异常的正确与灵活运用：将有效地增强程序的交互性。增加程序的完整性。     

FORTRAN 200O异常处理机制的研究

异常处理是现代程序设计语言的一个重要特征,它为检测和恢复软件系统在运行时的错误、构建系统的容错处理提供了强有力的支持.本文分析了FORTRAN 2000的异常处理机制,并提出一种扩充方案,引入用户定义异常和异常处理区的概念,改进了异常的传播机制,从而使FORTRAN编程更好地实现普通代码和异常处理代码的分离,提高了程序的可读性和可维护性.     

浅析Java异常处理机制及应用

异常处理机制是Java语言的一大特色。从异常处理的机制、异常处理的方法、异常处理的原则等方面介绍Java语言的异常处理技术,分析了抛出异常和捕获异常的实际应用及注意事项,以便更好地利用异常处理机制解决实际问题。     

基于AOP的异常处理框架

传统的异常处理代码存在许多问题,尤其是代码不具有模块性,异常代码的维护很困难.面向方面编程(AOP)是一种新的编程技术,它弥补了面向对象编程(OOP)在跨越模块行为上的不足.利用AOP能够很好地分离出"异常处理"这一横切关注点,模块化构建松散耦合的系统.文章研究了在异常处理方面的通用策略和AOP在异常处理方面的应用,并给出了基于JBoss AOP的具体实现.该框架简单灵活,实用.     

一种快速测试Java异常处理机制的方法

异常处理机制能增强程序运行的可靠性，提高软件的健壮性，但异常处理代码本身可能存在错误．由于它的特殊性。采用与测试普通代码同样的方法对其进行测试，通常效率不高而且很难达到预期的效果．在分析了利用断言违背策略进行软件故障注入技术的基础上，提出了将Java异常处理机制的特殊结构同断言违背策略、程序变异技术相结合，可以有效地测试异常处理代码。并设计工具来支持这种故障注入方法．     

Only connect: teaching, technology and telesis

Abstract This paper describes an approach to the design of interactive multimedia materials being developed in a European Community project. The developmental process is seen as a dialogue between technologists and teachers. This dialogue is often problematic because of the differences in training, experience and culture between them. Conditions needed for fruitful dialogue are described and the generic model for learning design used in the project is explained.     

European Community policy and the market

Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven.     

一种自适应子融合集成多分类器方法

融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。     

煤矿井下安全监控分站的设计及其仿真实现

为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值.     

Avoiding semantic and temporal gaps in developing software intensive systems

Development of software intensive systems (systems) in practice involves a series of self-contained phases for the lifecycle of a system. Semantic and temporal gaps, which occur among phases and among developer disciplines within and across phases, hinder the ongoing development of a system because of the interdependencies among phases and among disciplines. Such gaps are magnified among systems that are developed at different times by different development teams, which may limit reuse of artifacts of systems development and interoperability among the systems. This article discusses such gaps and a systems development process for avoiding them.     

Designing economic np control charts: A programmed simulation approach

This paper presents control charts models and the necessary simulation software for the location of economic values of the control parameters. The simulation program is written in FORTRAN, requires only 10K of main storage, and can run on most mini and micro computers. Two models are presented - one describes the process when it is operating at full capacity and the other when the process is operating under capacity. The models allow the product quality to deteriorate to a further level before an existing out-of-control state is detected, and they can also be used in situations where no prior knowledge exists of the out-of-control causes and the resulting proportion defectives.     

The development of robot art

Going through a few examples of robot artists who are recognized worldwide, we try to analyze the deepest meaning of what is called “robot art” and the related art field definition. We also try to highlight its well-marked borders, such as kinetic sculptures, kinetic art, cyber art, and cyberpunk. A brief excursion into the importance of the context, the message, and its semiotics is also provided, case by case, together with a few hints on the history of this discipline in the light of an artistic perspective. Therefore, the aim of this article is to try to summarize the main characteristics that might classify robot art as a unique and innovative discipline, and to track down some of the principles by which a robotic artifact can or cannot be considered an art piece in terms of social, cultural, and strictly artistic interest. This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January 31–February 2, 2008     

View-based model-driven architecture for enhancing maintainability of data access services

In modern service-oriented architectures, database access is done by a special type of services, the so-called data access services (DAS). Though, particularly in data-intensive applications, using and developing DAS are very common today, the link between the DAS and their implementation, e.g. a layer of data access objects (DAOs) encapsulating the database queries, still is not sufficiently elaborated, yet. As a result, as the number of DAS grows, finding the desired DAS for reuse and/or associated documentation can become an impossible task. In this paper we focus on bridging this gap between the DAS and their implementation by presenting a view-based, model-driven data access architecture (VMDA) managing models of the DAS, DAOs and database queries in a queryable manner. Our models support tailored views of different stakeholders and are scalable with all types of DAS implementations. In this paper we show that our view-based and model driven architecture approach can enhance software development productivity and maintainability by improving DAS documentation. Moreover, our VMDA opens a wide range of applications such as evaluating DAS usage for DAS performance optimization. Furthermore, we provide tool support and illustrate the applicability of our VMDA in a large-scale case study. Finally, we quantitatively prove that our approach performs with acceptable response times.     

Explanation and prediction: an architecture for default and abductive reasoning

Although there are many arguments that logic is an appropriate tool for artificial intelligence, there has been a perceived problem with the monotonicity of classical logic. This paper elaborates on the idea that reasoning should be viewed as theory formation where logic tells us the consequences of our assumptions. The two activities of predicting what is expected to be true and explaining observations are considered in a simple theory formation framework. Properties of each activity are discussed, along with a number of proposals as to what should be predicted or accepted as reasonable explanations. An architecture is proposed to combine explanation and prediction into one coherent framework. Algorithms used to implement the system as well as examples from a running implementation are given.     

A pragmatic multi-method investigation of discrepant technological events: Coping,attributions, and ‘accidental’ learning

Discrepant technological events or situations that entail a problem, a misunderstanding or a difficulty with the Information Technology (IT) being employed, are common in the workplace, and can lead to frustration and avoidance behaviors. Little is known, however, about how individuals cope with these events. This paper examines these events by using a multi-method pragmatic approach informed by coping theory. The results of two studies – a critical incident study and an experiment – serve to build and test, respectively, a theoretical model that posits that individuals use a variety of strategies when dealing with these events: they experience negative emotions, make external attributions, and adopt engagement coping strategies directed at solving the event, eventually switching to a disengagement coping strategy when they feel they have no control over the situation. Furthermore, users’ efforts may result in ‘accidental’ learning as they try to overcome the discrepant IT events through engagement coping. The paper ends with a discussion of the results in light of existing literature, future opportunities for research, and implications for practice.