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I want to implement JUnit tests in order to do some refactoring. First I'd like to check how good the class is, whether it's implemented for testability. Is there any metric and tools I could use to measure how testable a Java class is?
Probably you're looking for the Testability Explorer. Latest code seems to be on github.
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I have a very big project on java and I want to know time and class that JVM calls for debugging purposes.
Use Java VisualVM for profiling the application. See the instructions here.
Also other commercial and non-commercial profilers are available. See this article for more information.
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what is recommended in competitive programming defining classes or using the java libraries?eg.stack or linked lists.Does performance of code depends on it?
Normally you don't need to write your own classes for saving and managing some objects in a list.
I recommend you not to invent the wheel again.
Except you do it for a learning purpose.
The problem with writing your own classes for critical operations is that you can't do it better than a team of some pretty smart heads. Neither do I.
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I have to make app using java technology and it should work same as drop box is working. So can you suggest how to start or which jar is required for it?
From the question it looks like you are new to Java. So your best bet would be to use an existing library to do the sync. Java is often not considered the ideal choice for file intensive tasks due to performance issues.
eg:
http://jfilesync.sourceforge.net/
Also see this: https://stackoverflow.com/questions/2283958/java-folder-synchronisation-class-library
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I heard that there is a possibility to check if the class is thread-safe.
Is it so? How to do that?
The question was HOW so here is the answer:
go to Settings->Inspections and there choose Threading issues and Concurrency annotation issues
I think you have to look at FindBugs project. It makes static analysis of code and possibly can find some concurrency problems. There is also plugin for intelliJ which can be integrated with this tool.
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Co-Browsing in the context of web browsing, is the joint navigation through the Internet by two or more people accessing the same web pages at the same time.
for more information please have a look at http://en.wikipedia.org/wiki/Cobrowsing
here are some paid alternatives which does this
http://www.livelook.com/co_browsing.asp
http://www.unblu.com/
any help regarding what technology is being used to implement this or technical specifications ?
i am trying to implement co-browsing using java, has any one have prior experience with that if its possible or any existing java library doing the same?
if there is not any solution what approach should i use to implement this.