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What is EMX files and why do we use it. I'm doing some analysis and here I got these files. I explored and get to know that it is something related to UML but I'm not clear on this.
File extensions are free. So the name of an extension is not sufficient to give assurance about its content, unless it’s a format used by a popular software package. Name conflicts are not uncommon.
If narrowing down the search with some contextual information such as XML and UML that you provide in the tags, it seems to be a file format used by Rational Software Architect to save UML models, according to this and this website of other popular UML tools.
You now have to confirm this hypotheses by analyzing the file content.
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I often see tutorials instruct us to generate both sources.jar and javadoc.jar. Some IDEs also download both jars by default. Is there any reason behind it? Why don't IDEs just download the sources.jar if it's exist since they could read the Javadocs from it?
Published javadoc contains a set of connected HTML files ready to be viewed in a browser. The processing is not trivial.
Your analogy is similar to “why publish binaries if people can just download the sources which contain the same”. (Maven is just a fancy cache for javac) and the answer is the same: to make it easier to use.
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I am new to Java development and just saw a file with .bak extension that looks like a java class but it is not. So I am wondering what is the purpose of the .bak files in general and why and when should I use it?
There is no special purpose for java files (or tooling here).
bak typically resorts to backup.
Such files get generated by various tools. These tools create bak files to avoid overwriting your original file. So there is no specific notion towards "java technology" here.
Simply look into the tools (mainly: your editor), and see if their help tells you about automatically creating backup file. The old Windows notepad editor did that for example.
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I do not know if this is the right place to ask this question, but I have been wondering, what languages can one use to create a file format, I am working on an android app which reads and writes files, I want to create a unique file format which it only can read, I know each format uses different algorithms, that is why am asking if anyone knows any references I can look at, I can not seem to find any documentation online on this topic.
Any language can be used to create any kind of files if you know the encoding and encryption type of those file formats. If you really need a unique type of file for your application, simply save serialized objects or encrypt and save the serialized stream and use any desired extension.
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I am trying to figure out how they created all of the methods in java, because w/o these objects we wouldn't be able to do much. If there is any website you could link me, it would be much appreciated. & sorry if i am off topic.
http://grepcode.com/snapshot/repository.grepcode.com/java/root/jdk/openjdk/7-b147/
Here you can see the source code for all the standard library. For example, the String class:
http://grepcode.com/file_/repository.grepcode.com/java/root/jdk/openjdk/7-b147/java/lang/String.java/?v=source
I think the entire source for the standard lib also comes with the JDK, in some folder somewhere, but I don't remember.
Of course the standard library is not all that makes java, because you also have the JVM. But since you're talking about objects, I guess that's what you want.
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So i just got internship at a firm and there we have to work with java. I have been a C guy all my life but i am familiar with the basic OOP fundamentals.
Now there is a file ivy.xml.
I asked someone what it was and how do i use it and I just got that it resolves all the dependencies in the code.
Now can someone help me in understanding what it is, what does one mean by the dependency resolution and how do i configure it to my uses?
Maybe a simple example can help understanding more quickly.
Thanks a tonne.
Ivy is a plugin to ant, one of the most popular build tools (a bit like make or autotools) for java. There are many ways in which it can be configured, both in that ivy.xml file and in the build.xml for ant. I'd stick with established practice already used in that firm, i.e. modify the structure of these files as little as possible. To understand the stuff already present, either read the manuals or provide file snippets along with specific questions.