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Paper Abstract and Keywords
Presentation 2017-03-09 11:50
Equivalence Checking for Methods in Java and Its Applications
Kozo Okano (Shinshu Univ.), Satoshi Harauchi (Mitsubishi Electric Corp.), Shinpei Ogata (Shinshu Univ.), Toshifusa Sekizawa (Nihon Univ.), Takeshi Obara (Shinshu Univ.) SS2016-65
Abstract (in Japanese) (See Japanese page) 
(in English) A programmer sometimes implements both of equals method and hashCode method in a class of Java. The programmer should obey the implementation rules for these methods. One of the rules is that two objects that meet equals method results have to have the same hashCode value. Some of studies including our previous work provide static analysis methods for checking the rules. Our previous work has some issues: (1) the target methods should have no loop structures; and (2) it transforms the methods into a set of SAT/SMT constraints, which is not easy to understand its validity. This report provides yet another solution for the issues. The new proposed method uses equivalence checking for methods/functions. The checking function is provided by SAW, a new tool developed as an open source software. We also state that the method is useful to reduce the cost of regression testing for refactoring of the methods and revise of fields of the class.
Keyword (in Japanese) (See Japanese page) 
(in English) Symbolic Execution / Equivalence Checking / Theorem proover / equals method / hashCode method / / /  
Reference Info. IEICE Tech. Rep., vol. 116, no. 512, SS2016-65, pp. 31-36, March 2017.
Paper # SS2016-65 
Date of Issue 2017-03-02 (SS) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
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All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
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Conference Information
Committee SS  
Conference Date 2017-03-09 - 2017-03-10 
Place (in Japanese) (See Japanese page) 
Place (in English)  
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Topics (in English)  
Paper Information
Registration To SS 
Conference Code 2017-03-SS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Equivalence Checking for Methods in Java and Its Applications 
Sub Title (in English)  
Keyword(1) Symbolic Execution  
Keyword(2) Equivalence Checking  
Keyword(3) Theorem proover  
Keyword(4) equals method  
Keyword(5) hashCode method  
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1st Author's Name Kozo Okano  
1st Author's Affiliation Shinshu University (Shinshu Univ.)
2nd Author's Name Satoshi Harauchi  
2nd Author's Affiliation MitsubishElectric Corporation (Mitsubishi Electric Corp.)
3rd Author's Name Shinpei Ogata  
3rd Author's Affiliation Shinshu University (Shinshu Univ.)
4th Author's Name Toshifusa Sekizawa  
4th Author's Affiliation Nihon University (Nihon Univ.)
5th Author's Name Takeshi Obara  
5th Author's Affiliation Shinshu University (Shinshu Univ.)
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Speaker Author-1 
Date Time 2017-03-09 11:50:00 
Presentation Time 25 minutes 
Registration for SS 
Paper # SS2016-65 
Volume (vol) vol.116 
Number (no) no.512 
Page pp.31-36 
#Pages
Date of Issue 2017-03-02 (SS) 


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