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关键词： Java   自定义   输入输出  

摘要： 利用Java流的概念和异常处理技术,开发了自定义的Java基本类型的随机输入输出应用程序,解决Java交互输入输出过程中通过键盘输入的问题.此方法已在实际教学中使用,应用程序不仅简洁而且使用方便.

关键词： Java程序   可达性测试   同步序列   时序约束   竞争变形体  

摘要： 为了提高在Java程序可达性测试中的同步序列生成效率,提出了一个新算法从无时序约束关系的同步事件派生竞争变形体集,避免或减少了不可行的竞争变形体的生成.定义了同步事件之间的线程家族时序约束关系,并详述了此约束关系的信息抽取算法和判定算法.

关键词： Java   J2EE   BMP   反射  

摘要： 类反射机制是Java所具有的一个比较复杂的功能。这种机制使您能够检查类的结构,还可提供域、方法、访问修饰符等运行时的信息。本文着重描述如何利用这种机制配合JavaBean映射数据库来减轻开发BMP的难度,同时提高使用BMP时的网络性能。

关键词： 内存泄漏   垃圾回收   内存低效   Java  

摘要： 从与C/C++内存泄漏对比的角度分析了Java内存泄漏问题,详细介绍了Java内存泄漏的相关研究和工具,探讨了当前研究和工具中存在的不足并分析了其原因,总结了内存泄漏相关领域研究的发展趋势。

关键词： PAR方法   Apla—Java   可重用部件   并行   并发  

摘要： 介绍了一种基于Apla-Java可重用部件库并行(并发)程序的开发方法,包括Apla-Java可重用部件的设计策略以及部件库并行并发机制的实现方法。并通过一个并行计算的实例验证了Apla-Java可重用部件库应用于并行(并发)程序设计的正确性。

关键词： fault localization   semantic change impact analysis   edit change dependence   regression testing   intermediate versions of programs  

摘要： During program maintenance, a programmer may make changes that enhance program functionality or fix bugs in code. Then, the programmer usually will run unit/regression tests to prevent invalidation of previously tested functionality. If a test fails unexpectedly, the programmer needs to explore the edit to find the failure-inducing changes for that test. Crisp uses results from Chianti, a tool that performs semantic change impact analysis [ 1], to allow the programmer to examine those parts of the edit that affect the failing test. Crisp then builds a compilable intermediate version of the program by adding a programmer-selected partial edit to the original code, augmenting the selection as necessary to ensure compilation. The programmer can reexecute the test on the intermediate version in order to locate the exact reasons for the failure by concentrating on the specific changes that were applied. In nine initial case studies on pairs of versions from two real Java programs, Daikon [ 2] and Eclipse jdt compiler [ 3], we were able to use Crisp to identify the failure-inducing changes for all but 1 of 68 failing tests. On average, 33 changes were found to affect each failing test ( of the 67), but only 1-4 of these changes were found to be actually failure-inducing.

关键词： Amoebozoa   Archaeplastida   Chromalveolata   Excavata   Opisthokonta   phylogenetic tree   phylogeny   Rhizaria   teaching   tree of life  

摘要： We have converted the hierarchically organized new higher level classification of eukaryotes with emphasis on the taxonomy of protists proposed by Adl et al. into an interactive and dynamic Java applet. The current version of the applet can be accessed via http://***/etv. We use the layout from a Degree-of-Interest tree (DOITree) that effectively displays all the taxonomic information as well as the phylogenetic relationships described in the original article by Adl et al. The tree was made using the Prefuse Toolkit for interactive information visualization. All browsers capable of using Java applets will be able to view the tree. The applet is freely available for scientists, teachers, and students.

关键词： garbage collection   heap growth   implementation   Java   memory   management   performance measurement   programming languages  

摘要： In systems that support garbage collection, a tension exists between collecting garbage too frequently and not collecting it frequently enough. Garbage collection that occurs too frequently may introduce unnecessary overheads at the risk of not collecting much garbage during each cycle. On the other hand, collecting garbage too infrequently can result in applications that execute with a large amount of virtual memory (i.e., with a large footprint) and suffer from increased execution times due to paging. In this article, we use a large set of Java applications and the highly tuned and widely used Boehm-Demers-Weiser (BDW) conservative mark-and-sweep garbage collector to experimentally examine the extent to which the frequency of garbage collection impacts an application's execution time, footprint, and pause times. We use these results to devise some guidelines for controlling garbage collection and heap growth in a conservative garbage collector in order to minimize application execution times. Then we describe new strategies for controlling garbage collection and heap growth that impact not only the frequency with which garbage collection occurs but also the points at which it occurs. Experimental results demonstrate that when compared with the existing

关键词： 内存泄漏   垃圾回收   虚拟机  

摘要： Java语言的一个显著特点是它通过虚拟机和垃圾回收机制管理着大部分的内存事务,但是在Java程序中还是可能存在内存泄漏问题。文中首先对Java内存泄漏做一个简要的定义,接着围绕一个实例详细地介绍如何用工具检测Java内存泄漏,最后列举了一些典型的泄漏,以便读者在Java程序开发中尽量避免类似的内存泄漏。

关键词： Java   布局管理器   图形用户界面   类  

摘要： 介绍Java布局管理的机制、特点以及在图形用户界面设计中的应用,并提出了用接口LayoutManager或LayoutManager2设计自己布局管理的思想。