?
Solved

obtaining line of codes from a class file

Posted on 2002-06-27
8
Medium Priority
?
248 Views
Last Modified: 2010-03-31
i'm currently developing a metric tool (e.g., depth of inheritance, number of private methods, number of public fields and etc). my input(s) to the tool is(are) java class(es)- (.class extension).

i wonder is it possible to obtain metrics such as LINE OF CODES (line of comments, line of executable codes and etc) just from java classes (files with .class extension).

some samples are appreciated.
0
Comment
Question by:ervinloh
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
8 Comments
 
LVL 1

Accepted Solution

by:
mraible earned 200 total points
ID: 7114033
I would venture to say that .class files don't have lines of code being that they're binary files.  And also, .class files don't have comments.  The compiler strips them out.

However, you might be able to get fields, methods, etc. using the java.lang.reflection package.

For methods available on a class see:

http://java.sun.com/j2se/1.3/docs/api/java/lang/Class.html

So to answer your question: my guess is no.
0
 

Author Comment

by:ervinloh
ID: 7114041
to mraible,

getting fields, methods and etc is not a problem. only line of codes is giving me the problems.
0
 
LVL 35

Expert Comment

by:girionis
ID: 7114221
 You can get the lines of code from the Java source file (if it is available) and not from the class file itself. Just read the file and check for the "\n" character (newline).

  Hope it helps.
0
Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 
LVL 86

Expert Comment

by:CEHJ
ID: 7115015
Can't get source code from class file. Only from source file.
0
 
LVL 92

Expert Comment

by:objects
ID: 7115401
You can use a decompiler to generate source from a class file. However this will not be the same as the source code before it was compiled so i'm not sure of its value for metrics purposes. But it may help you.

0
 
LVL 3

Expert Comment

by:yasser_helmy
ID: 7124904
The class file does not have lines. The compiler strips comments and blank line. It also generates binary code instead of the source code, which means the source code is not available any more. The compilation process lossses the information about number of lines, comments, and the explicit code written.
0
 
LVL 35

Expert Comment

by:girionis
ID: 8893445
No comment has been added lately, so it's time to clean up this TA.

I will leave a recommendation in the Cleanup topic area that this question is:

- points to mraible

Please leave any comments here within the
next seven days.

PLEASE DO NOT ACCEPT THIS COMMENT AS AN ANSWER !

girionis
Cleanup Volunteer
0

Featured Post

Free Tool: ZipGrep

ZipGrep is a utility that can list and search zip (.war, .ear, .jar, etc) archives for text patterns, without the need to extract the archive's contents.

One of a set of tools we're offering as a way to say thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

For beginner Java programmers or at least those new to the Eclipse IDE, the following tutorial will show some (four) ways in which you can import your Java projects to your Eclipse workbench. Introduction While learning Java can be done with…
Introduction This article is the last of three articles that explain why and how the Experts Exchange QA Team does test automation for our web site. This article covers our test design approach and then goes through a simple test case example, how …
Viewers learn about the “for” loop and how it works in Java. By comparing it to the while loop learned before, viewers can make the transition easily. You will learn about the formatting of the for loop as we write a program that prints even numbers…
Viewers will learn one way to get user input in Java. Introduce the Scanner object: Declare the variable that stores the user input: An example prompting the user for input: Methods you need to invoke in order to properly get  user input:
Suggested Courses
Course of the Month7 days, 19 hours left to enroll

765 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question