A fill-in-blank problem workbook for Java programming learning assistant system

PurposeTo advance Java programming educations, the authors have developed a Java Programming Learning Assistant System (JPLAS) as a web application system. JPLAS provides fill-in-blank problems for novices to study the grammar and basic programming skills through code reading.Design/methodology/appr...

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Vydáno v:International journal of Web information systems Ročník 13; číslo 2; s. 140 - 154
Hlavní autoři: Funabiki, Nobuo, Zaw, Khin Khin, Ishihara, Nobuya, Matsumoto, Shinpei, Kao, Wen-Chung
Médium: Journal Article
Jazyk:angličtina
Vydáno: Bingley Emerald Group Publishing Limited 19.06.2017
Témata:
Adequacy
Algorithms
Assistants
BASIC (programming language)
Categories
Embedded systems
Java
Learning
Naming
Novices
Onomastics
Readability
Software
Students
Teachers
Textbooks
Websites
ISSN:1744-0084, 1744-0092
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Abstract PurposeTo advance Java programming educations, the authors have developed a Java Programming Learning Assistant System (JPLAS) as a web application system. JPLAS provides fill-in-blank problems for novices to study the grammar and basic programming skills through code reading.Design/methodology/approachTo select the blank elements with grammatically correct and unique answers from a given Java code, the authors have proposed the graph-based blank element selection algorithm. Then, the code for this problem should be highly readable to encourage novice students to study it. Because code readability can be improved by proper names for identifiers, the authors have also proposed the naming rule testing algorithm to identify codes with correct names.FindingsIn this paper, the authors present a fill-in-blank problem workbook by collecting suitable Java codes from textbooks and Web sites and applying these algorithms with several extensions. The workbook consists of 16 categories with a considerable number of problems that follow the conventional learning order of Java programming.Originality/valueThe proper set of ready-made fill-in-blank problems is effective in enhancing the usability of JPLAS both for teachers and students. For the preliminary evaluation, the authors assign a few problems to students. In coming semesters, the authors will use this workbook in the course to verify the adequacy of the proposal for novices.
AbstractList PurposeTo advance Java programming educations, the authors have developed a Java Programming Learning Assistant System (JPLAS) as a web application system. JPLAS provides fill-in-blank problems for novices to study the grammar and basic programming skills through code reading.Design/methodology/approachTo select the blank elements with grammatically correct and unique answers from a given Java code, the authors have proposed the graph-based blank element selection algorithm. Then, the code for this problem should be highly readable to encourage novice students to study it. Because code readability can be improved by proper names for identifiers, the authors have also proposed the naming rule testing algorithm to identify codes with correct names.FindingsIn this paper, the authors present a fill-in-blank problem workbook by collecting suitable Java codes from textbooks and Web sites and applying these algorithms with several extensions. The workbook consists of 16 categories with a considerable number of problems that follow the conventional learning order of Java programming.Originality/valueThe proper set of ready-made fill-in-blank problems is effective in enhancing the usability of JPLAS both for teachers and students. For the preliminary evaluation, the authors assign a few problems to students. In coming semesters, the authors will use this workbook in the course to verify the adequacy of the proposal for novices.
Author Matsumoto, Shinpei
Zaw, Khin Khin
Kao, Wen-Chung
Funabiki, Nobuo
Ishihara, Nobuya
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References key2020120701574709600_ref023
key2020120701574709600_ref022
key2020120701574709600_ref025
key2020120701574709600_ref024
key2020120701574709600_ref027
key2020120701574709600_ref026
key2020120701574709600_ref029
(key2020120701574709600_ref008) 2013
(key2020120701574709600_ref003) 2016
key2020120701574709600_ref020
(key2020120701574709600_ref010) 2014
key2020120701574709600_ref019
key2020120701574709600_ref033
(key2020120701574709600_ref004) 2016
key2020120701574709600_ref016
(key2020120701574709600_ref005) 1979
key2020120701574709600_ref015
key2020120701574709600_ref018
key2020120701574709600_ref017
(key2020120701574709600_ref028) 2003
(key2020120701574709600_ref006) 2016
(key2020120701574709600_ref002) 2015
(key2020120701574709600_ref012) 2014
key2020120701574709600_ref030
key2020120701574709600_ref032
key2020120701574709600_ref031
(key2020120701574709600_ref007) 2012; 12
(key2020120701574709600_ref013) 2012; 6
(key2020120701574709600_ref011) 2015
(key2020120701574709600_ref014) 2013; 2013
(key2020120701574709600_ref021) 2011
(key2020120701574709600_ref001) 2013; 40
(key2020120701574709600_ref009) 2014
References_xml – ident: key2020120701574709600_ref031
– ident: key2020120701574709600_ref033
– ident: key2020120701574709600_ref029
– volume: 12
  start-page: 153
  year: 2012
  ident: key2020120701574709600_ref007
  article-title: Modeling how students learn to program
  publication-title: Procceeding SIGCSE ’
– start-page: 335
  year: 2014
  ident: key2020120701574709600_ref012
  article-title: What influences dwell time during source code reading? Analysis of element type and frequency as factors
– ident: key2020120701574709600_ref025
– volume: 2013
  start-page: 405
  year: 2013
  ident: key2020120701574709600_ref014
  article-title: INVocD: identifier name vocabulary dataset
  publication-title: Proceeding MSR
– ident: key2020120701574709600_ref027
– volume: 40
  start-page: 38
  issue: 1
  year: 2013
  ident: key2020120701574709600_ref001
  article-title: A Java programming learning assistant system using test-driven development method
  publication-title: International Journal of Computer Science
– ident: key2020120701574709600_ref023
– ident: key2020120701574709600_ref017
– start-page: 43
  year: 2014
  ident: key2020120701574709600_ref010
  article-title: Investigating novice programming mistakes: educator beliefs vs student data
– year: 2013
  ident: key2020120701574709600_ref008
  article-title: JavaParser: a fine-grained concept indexing tool for Java problems
– ident: key2020120701574709600_ref019
– volume-title: Data Structures and Algorithms
  year: 2003
  ident: key2020120701574709600_ref028
– start-page: 561
  year: 2016
  ident: key2020120701574709600_ref006
  article-title: A proposal of coding rule learning function in Java programming learning assistant system
– ident: key2020120701574709600_ref015
– ident: key2020120701574709600_ref030
– start-page: 448
  year: 2015
  ident: key2020120701574709600_ref002
  article-title: A proposal of graph-based blank element selection algorithm for Java programming learning with fill-in-blank problem
– ident: key2020120701574709600_ref032
– volume-title: Computers and Intractability: A Guide to the Theory of NP-Completeness
  year: 1979
  ident: key2020120701574709600_ref005
– volume-title: Algorithm and Data Structure for Java Programmers
  year: 2011
  ident: key2020120701574709600_ref021
– ident: key2020120701574709600_ref024
– start-page: 204
  year: 2016
  ident: key2020120701574709600_ref004
  article-title: A core blank element selection algorithm for code reading studies by fill-in-blank problems in Java programming learning assistant system
– ident: key2020120701574709600_ref026
– ident: key2020120701574709600_ref022
– start-page: 3
  year: 2016
  ident: key2020120701574709600_ref003
  article-title: A proposal of three extensions in blank element selection algorithm for Java programming learning assistant system
– ident: key2020120701574709600_ref020
– ident: key2020120701574709600_ref018
– year: 2015
  ident: key2020120701574709600_ref011
  article-title: 37 million compilations: investigating novice programming mistakes in large-scale student data
– start-page: 76
  year: 2014
  ident: key2020120701574709600_ref009
  article-title: A study on implementation and usage of web based programming assessment system: code
– volume: 6
  start-page: 201
  issue: 4
  year: 2012
  ident: key2020120701574709600_ref013
  article-title: Design and implementation of a compiler with secure coding rules for secure mobile applications
  publication-title: International Journal of Security and its Applications
– ident: key2020120701574709600_ref016
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SubjectTerms Adequacy
Algorithms
Assistants
BASIC (programming language)
Categories
Embedded systems
Java
Learning
Naming
Novices
Onomastics
Readability
Software
Students
Teachers
Textbooks
Websites
Title A fill-in-blank problem workbook for Java programming learning assistant system
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