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关键词： Java教学资源   软件开发实践能力   教材   题库   案例库  

摘要： 高校《Java程序设计》课程教学的核心目标是提高学生使用Java和面向对象编程技术开发应用软件的实践能力,因此教学中需要相应的教学资源的支撑。本文介绍了围绕提升学生软件开发实践能力开展的Java课程教学资源建设方面的改革,提出了"MOOC+案例驱动式教材+信息化辅助教学平台+企业级案例库"的教学资源建设模式。首先,为配合基于"MOOC+翻转课堂"的教学模式,建设包含知识点视频和案例讲解视频的MOOC视频资源,并将其作为配套资源,撰写了案例驱动的《Java程序设计》教材;其次,引入了程序设计类实验辅助教学平台(PTA),丰富了教学的习题库;最后,通过校企合作,建设了适用于教学实践和实训的企业级项目资源案例库。

关键词： Big code   Machine learning   Syntax patterns   Abstract syntax trees   Programmer expertise   Decision trees   Big data  

摘要： Open-source code repositories are a valuable asset to creating different kinds of tools and services, utilizing machine learning and probabilistic reasoning. Syntactic models process Abstract Syntax Trees (AST) of source code to build systems capable of predicting different software properties. The main difficulty of building such models comes from the heterogeneous and compound structures of ASTs, and that traditional machine learning algorithms require instances to be represented as n-dimensional vectors rather than trees. In this article, we propose a new approach to classify ASTs using traditional supervised-learning algorithms, where a feature learning process selects the most representative syntax patterns for the child subtrees of different syntax constructs. Those syntax patterns are used to enrich the context information of each AST, allowing the classification of compound heterogeneous tree structures. The proposed approach is applied to the problem of labeling the expertise level of Java programmers. The system is able to label expert and novice programs with an average accuracy of 99.6%. Moreover, other code fragments such as types, fields, methods, statements and expressions could also be classified, with average accuracies of 99.5%, 91.4%, 95.2%, 88.3% and 78.1%, respectively. (C) 2019 Elsevier B.V. All rights reserved.

关键词： program testing   Java   model-based testing platform   Java applications   model building   test selection criteria   test case generation   test case execution   automation support   open-source Java systems   MBT4J platform   ModelJUnit  

摘要： Model-based testing (MBT) automates the design and generation of test cases from a model. This process includes model building, test selection criteria, test case generation, and test case execution stages. Current tools support this process at various levels of automation, most of them supporting three out of four stages. Among them is MBT4J, a platform that extends ModelJUnit with several techniques, offering a high level of automation for testing Java applications. In this study, the authors evaluate the efficacy of the MBT4J platform, in terms of the number of test cases generated, errors detected, and coverage metrics. A case study is conducted using two open-source Java systems from public repositories, and 15 different configurations. MBT4J was able to automatically generate five models from the source code. It was also able to generate up to 2025 unique test cases for one system and up to 1044 for the other, resulting in 167 and 349 failed tests, respectively. Transition and transition pair coverage reached 100% for all models. Code coverage ranged between 72 and 84% for the one system and between 59 and 76% for the other. The study found that Greedy and Random were the most effective testers for finding errors.

关键词： abnormality   fault-prone method analysis   local variable   Mahalanobis distance   naming   scope  

摘要： Programmers are familiar with local variables, and in many cases, they can freely define the local variables they use. Thus, the properties of these variables are widely diverse, and this may cause variations in the quality of code. Although variables are named in accordance with coding conventions, the following matters have not received much attention from an empirical viewpoint: automatically deciding whether a local variable is "abnormal" and determining the harmful effect of an abnormal variable. This study focuses on the trends in the name, type, and scope of local variables, then proposes the use of the Mahalanobis distance to evaluate their abnormality. The empirical study entailed collecting local variables from eight open-source software projects, and the paper reports the following findings: (a) the trend in the variation of the names of variables according to their type;(b) the majority of variables have short names with narrow scopes, where a name is often a word or an abbreviation thereof;(c) methods with an abnormal variable are approximately 1.4 times more likely to be fault prone than methods that contain only normal variables;(d) the proposed abnormality metric can be useful in a random forest-based fault-prone method analysis model.

关键词： 图形用户界面   组件   容器   布局管理器   事件  

摘要： Java语言程序设计中可以设计出满足用户需求的图形用户界面,在界面中可以包含组件、容器、布局管理器、事件等内容。本文针对图形界面中的几个案例进行分析和说明,以此让读者能更好地掌握有关图形用户界面的有关编程技巧。

关键词： 个性化教学   过程性评价   混合式教学   因材施教   学习主动性  

摘要： 针对在专业课教学中存在的学生学习主动性不足和传统教学模式不能适应学生的差异化需求等问题,基于翻转课堂和混合式教学,引入过程性评价机制,提出了一种个性化教学模式。以Java程序设计课程为例,介绍了个性化教学的设计思路、实施方案和实施过程,最后的实施效果表明,学生的学习成绩和学习主动性都有显著提高,得到了较好的教学效果。

关键词： Java程序   安全性分析   应用研究  

摘要： 随着现代计算机技术的不断发展与进步,被广泛应用在多个行业中。但是,随着计算机软件大量应用,导致一些恶意攻击问题出现。这些恶意攻击,造成极大经济损失。要想解决当前计算机软件应用过程中出现的不安全问题,就要在Java程序中,对安全分析法应用进行深入研究,进而提升软件安全性,对软件进行监管,使计算机软件得到广泛应用同时,保障其安全运行,规避不必要经济损失。

关键词： PDCA循环   Java程序设计课程   教学改革  

摘要： 本文针对中职Java程序设计教学中学生计算机操作水平参差不齐、课程内容难度大、学生学习能力偏弱等问题,提出基于PDCA循环推进中职Java程序设计教学改革,按照"计划—实施—检查—处理",将教学过程分为教学计划阶段、教学实施阶段、教学检查阶段、教学处理阶段来实施。

关键词： 中高职教育   课程教学   衔接体系  

摘要： 职业教育课程改革包括中等职业教育和高等职业教育。中职与高职课程有效衔接一直是阻碍职业教育发展的障碍。本文将着重探讨课程规划,整合教学内容,实施课程的教学。

关键词： Java程序设计   立体化教材   多媒体  

摘要： 一般情况下,在Java程序设计立体化教材建设当中,为了使Java程序设计课程不断满足教学需要,我们会不断创新工作方法,利用高校软件技术类专业教材作为Java程序设计立体化教材的重要组成部分。本篇文章主要通过对一些Java程序设计课程立体化教材的不断探索,不断提高立体化教材体系,使学生的Java课程学习更加方便快捷,不断提升学生的创新能力。