The SUN-era [Java Language Specification][1] gives a suggested convention:

&gt; If the domain name contains a hyphen, or any other special character not allowed in an [identifier][2] (&#167;3.8), convert it into an underscore.

But it&#39;s just a suggestion...


  [1]: https://web.archive.org/web/20090201061750/http://java.sun.com/docs/books/jls/third_edition/html/packages.html
  [2]: https://docs.oracle.com/javase/specs/jls/se12/html/jls-3.html#jls-3.8

I just looked through my browser&#39;s history, and in the last 2 months I haven&#39;t visited a single domain with a hyphen. So the convention is to rename the company.

Alternatively, leave out the hyphen, because BazBaz won&#39;t ever include Baz=Baz&#39;s code in their own.

I would personally just remove the hyphen. You *could* change it into an underscore, but that would look pretty ugly.

It&#39;s highly unlikely it&#39;s *really* going to clash with another company with the same name minus the hyphens. Even if both companies are tech companies, both using Java, what are the chances that anyone&#39;s going to be using code created by both of them in the same codebase?

To be honest, I wish that Java hadn&#39;t gone down this path in terms of conventions. I wonder how many directories called &quot;com&quot; or &quot;org&quot; exist with a single member - a subdirectory with a more meaningful name.

Just drop the hyphen.  The package name doesn&#39;t need to match the website name at all.  It is more important that there&#39;s consistency among packages produced by the company so they all use the same base package name.

I work on lots of government stuff and we typically use the underscore so bar_baz.  

I&#39;m hoping there&#39;s a simple way to do this without using a sub-query:

Scenario:  You have &quot;TableA&quot; with columns &quot;Key&quot;, &quot;SubKey&quot;, and &quot;Value&quot;.  I need to get the &quot;Value&quot; of the MAX(&quot;SubKey&quot;) for a given &quot;Key&quot;.

So if the Table contained the rows:

    KEY SUBKEY VALUE
    1   1      100
    1   2      200
    1   3      300

For Key = 1, I need the value 300.  I was hoping to do something like this:

    SELECT
      VALUE
    FROM
      TableA
    WHERE
      Key = 1
    HAVING
      SubKey = MAX(SubKey)

But that&#39;s a no-go.  Is there a way to do this without doing a &#39;WHERE SubKey = (subselect for max subkey)&#39;?

T-SQL: Selecting Column Based on MAX(Other Column)

I am confused by a program mentioned in K&amp;R that uses `getchar()`. It gives the same output as the input string:

    #include &lt;stdio.h&gt;
    
    main(){
        int c;
        c = getchar();
        while(c != EOF){
             putchar(c);
             c = getchar();
        }
    }


Why does it print the whole string? I would expect it to read a character and ask again for the input.

And, are all strings we enter terminated by an EOF?





`getchar()` gives the same output as the input string

Say you&#39;re working on the core module of the `foo` project for BarBaz Incorporated. Your code fragment might look like this:

    package com.barbaz.foo.core;

    import com.barbaz.foo.util;

What would the convention be if your company&#39;s website was not `barbaz.com`, but instead `bar-baz.com`?

Hyphenated company name in Java packages

Say you're working on the core module of the <code>foo</code> project for BarBaz Incorporated. Your code fragment might look like this:
<pre><code class="hljs language-go">package com.barbaz.foo.core;

import com.barbaz.foo.util;
</code></pre>
What would the convention be if your company's website was not <code>barbaz.com</code>, but instead <code>bar-baz.com</code>?

I&#39;m looking for a simple method of converting between java.util.Date and javax.xml.datatype.XMLGregorianCalendar in both directions. 

**Here is the code that I&#39;m using now**:  

    import java.util.GregorianCalendar;
    import javax.xml.datatype.DatatypeConfigurationException;
    import javax.xml.datatype.DatatypeFactory;
    import javax.xml.datatype.XMLGregorianCalendar;

    /**
     * Utility class for converting between XMLGregorianCalendar and java.util.Date
     */
    public class XMLGregorianCalendarConverter {  

    	/**
    	 * Needed to create XMLGregorianCalendar instances
    	 */
    	private static DatatypeFactory df = null;
    	static {
    		try {
    			df = DatatypeFactory.newInstance();
    		} catch (DatatypeConfigurationException dce) {
    			throw new IllegalStateException(
    				&quot;Exception while obtaining DatatypeFactory instance&quot;, dce);
    		}
    	}  
    
    	/**
    	 * Converts a java.util.Date into an instance of XMLGregorianCalendar
    	 *
    	 * @param date Instance of java.util.Date or a null reference
    	 * @return XMLGregorianCalendar instance whose value is based upon the
    	 *  value in the date parameter. If the date parameter is null then
    	 *  this method will simply return null.
    	 */
    	public static XMLGregorianCalendar asXMLGregorianCalendar(java.util.Date date) {
    		if (date == null) {
    			return null;
    		} else {
    			GregorianCalendar gc = new GregorianCalendar();
    			gc.setTimeInMillis(date.getTime());
    			return df.newXMLGregorianCalendar(gc);
    		}
    	}

    	/**
    	 * Converts an XMLGregorianCalendar to an instance of java.util.Date
    	 *
    	 * @param xgc Instance of XMLGregorianCalendar or a null reference
    	 * @return java.util.Date instance whose value is based upon the
    	 *  value in the xgc parameter. If the xgc parameter is null then
    	 *  this method will simply return null.
    	 */
    	public static java.util.Date asDate(XMLGregorianCalendar xgc) {
    		if (xgc == null) {
    			return null;
    		} else {
    			return xgc.toGregorianCalendar().getTime();
    		}
    	}
    }


**Is there anything simpler, like some API call that I have overlooked?** 

Converting between a standard XML date/time and a Java date object seems like a pretty routine task and I&#39;m surprised that I have to write this code at all.

Any suggestions?


**NOTES:**
My JAXB classes are autogenerated from a schema. The build process on my project does not allow for me to make manual changes to the generated classes. The xs:dateTime elements are being generated by XJC as XMLGregorianCalendar in the JAXB classes. The schema is extended and tweaked periodically, so I am allowed to make limited changes to the schema XSD file.

**UPDATE ON SOLUTION:** 
The solution proposed by Blaise has allowed me to take XMLGregorianCalendar out of the mix and deal with java.util.Calendar objects instead. By adding a JAXB binding clause at the top of my schema file, XJC is able to generate more appropriate mappings for xs:dateTime in my JAXB classes. Here are some snippets that show the modifications in my XSD file.

*The root element in the XSD file:*

    &lt;xs:schema xmlns:mydata=&quot;http://my.example.com/mydata&quot; xmlns:xs=&quot;http://www.w3.org/2001/XMLSchema&quot; xmlns:jaxb=&quot;http://java.sun.com/xml/ns/jaxb&quot; targetNamespace=&quot;http://my.example.com/mydata&quot; elementFormDefault=&quot;unqualified&quot; attributeFormDefault=&quot;unqualified&quot; version=&quot;0.2&quot; xml:lang=&quot;en&quot; jaxb:version=&quot;2.0&quot;&gt;

*JAXB binding annotation block, inserted immediately after root element in XSD:*

    &lt;xs:annotation&gt;
        &lt;xs:appinfo&gt;
            &lt;jaxb:globalBindings&gt;
                &lt;jaxb:javaType name=&quot;java.util.Calendar&quot; xmlType=&quot;xs:dateTime&quot; parseMethod=&quot;javax.xml.bind.DatatypeConverter.parseDateTime&quot; printMethod=&quot;javax.xml.bind.DatatypeConverter.printDateTime&quot; /&gt;
            &lt;/jaxb:globalBindings&gt;
        &lt;/xs:appinfo&gt;
    &lt;/xs:annotation&gt;

Since the XML xs:dateTime field also stores timezone, it might be better for me to work with Calendar instead of Date anyway since Calendar objects have a pretty good API for working with locales and timezones. In any case, I&#39;m much happier to deal with Calendar objects instead of XMLGregorianCalendar. No need for the conversion methods that I listed above anymore. I didn&#39;t get all the way to java.util.Date, but close enough!

Simple conversion between java.util.Date and XMLGregorianCalendar

How can one get the screen resolution (width x height) in pixels?

I am using a JFrame and the java swing methods.

How can I get screen resolution in java?

I have two doubles like the following

    double min = 100;
    double max = 101;

and with a random generator, I need to create a double value between the range of min and max.

    Random r = new Random();
    r.nextDouble();

but there is nothing here where we can specify the range.

Generate a random double in a range

I have a problem with processing all rows from database (PostgreSQL). I get an error: `org.postgresql.util.PSQLException: Ran out of memory retrieving query results.` I think that I need to read all rows in small pieces, but it doesn&#39;t work - it reads only 100 rows (code below). How to do that?


    	int i = 0;		
		Statement s = connection.createStatement();
		s.setMaxRows(100); // bacause of: org.postgresql.util.PSQLException: Ran out of memory retrieving query results.
		ResultSet rs = s.executeQuery(&quot;select * from &quot; + tabName);		
		for (;;) {
			while (rs.next()) {
				i++;
				// do something...
			}
			if ((s.getMoreResults() == false) &amp;&amp; (s.getUpdateCount() == -1)) {
				break;
			}			
		}

How to read all rows from huge table?

I have the following logging problem with several Java applications using `log4j` for logging:

I want log files to be rotated daily, like

    log.2010-09-10
    log.2010-09-09
    log.2010-09-08
    log.2010-09-07
    log.2010-09-06
    log.2010-09-05
    log.2010-09-04

But for data security reasons we are not allowed to keep log files for longer than seven days at my company. So the generation of the next next log file `log.2010-09-11` should trigger the deletion of `log.2010-09-04`. Is it possible to configure such a behaviour with `log4j`? If not, do you know another elegant solution for this kind of logging problem?



How to configure log4j to only keep log files for the last seven days?

I come from a the Objective-C and Cocoa world where there are lots of conventions and many people will say it makes your code beautiful!
Now programming in C++ I cannot find a good document like this one for C++.

http://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/CodingGuidelines/CodingGuidelines.html

Standard C++ probably does not have something like above but I hope I can stick to some other SDK or APIs (like Microsoft&#39;s(?),etc) conventions. 

I hope you can provide me with some links.


What is a good naming convention for vars, methods, etc in C++?

I&#39;m currently in the process of moving some project from Ant to Maven. Conformist as I am, I want to use well-established conventions for finding `groupId` and `artifactId`, but I can&#39;t find any detailed conventions (there are some, but they don&#39;t cover the points I&#39;m wondering about).

Take this project for instance, first the Java package: `com.mycompany.teatimer`

*Tea timer* is actually two words, but the Java package naming conventions forbid the insertion of underscores or hyphens, so I&#39;m writing it all together.

I chose the `groupId` identical to the package ID because I think that&#39;s a good idea. Is it?

Finally, I have to pick an `artifactId`, I currently went for `teatimer`. But when I look at other Maven projects, they use hyphens to split words in `artifactId`s, like this: `tea-timer`. But it does look weird when concatenated to the `groupId`: `com.mycompany.teatimer.tea-timer`.

How would you do this?

Another example:

Package name: `com.mycompany.awesomeinhouseframework`

`groupId`: `com.mycompany.awesomeinhouseframework` (?)

`artifactId`: `awesome-inhouse-framework` (?)

Maven artifact and groupId naming

__Direct Question:__ If I have two files with the same name (but in different directories), it appears that only Visual Studio 2005 can handle this transparently??  VS 2008 &amp; 2010 require a bunch of tweaking?  Aside from my naming convention, am I doing something wrong?

__Background:__

I&#39;m developing C++ statistical libraries...  I have two folders:

    / Univariate
    
    Normal.cpp
    Normal.h
    Beta.cpp
    Beta.h
    Adaptive.cpp
    Adaptive.h
    
    / Multivariate
    
    Normal.cpp
    Normal.h
    Beta.cpp
    Beta.h
    Adaptive.cpp
    Adaptive.h

I need to support cross compilation -- I&#39;m using g++/make to compile these same files into a library in Linux.  They work just fine.

I had been using Visual Studio 2005 without issue, but I need to upgrade to Visual Studio 2008 or 2010 (currently drooling over nVidia&#39;s nsight tool).  However, I&#39;m having trouble if I add files to a project with the same name (even if they&#39;re in a different directory).  I&#39;m willing to change my naming convention, but I&#39;m curious if others have encountered this problem and have found any __well__ documented solutions??

I&#39;m further boggled by the fact that if I upgrade from 2005 projects to 2010 projects, it appears that VS 2010 __is__ able to correctly handle two source files with the same name in different directories; however, if I remove one of the duplicate files and then add it back to the project I am greeted by the following warning:

Distributions\Release\Adaptive.obj : warning LNK4042: object specified more than once; extras ignored

Now I have the intermediate directory specified as $(ProjectName)\$(Configuration) -- I need to have my object files in a different location from my source tree.  So I can see why it&#39;s copying the object files on top of each other, but when the projects are converted from 2005 to 2008 or 2010, a bunch of conditional compiles are added:

    &lt;ObjectFileName Condition=&quot;&#39;$(Configuration)|$(Platform)&#39;==&#39;Release|x64&#39;&quot;&gt;$(IntDir)%(Filename)1.obj&lt;/ObjectFileName&gt;
    &lt;XMLDocumentationFileName Condition=&quot;&#39;$(Configuration)|$(Platform)&#39;==&#39;Release|x64&#39;&quot;&gt;$(IntDir)%(Filename)1.xdc&lt;/XMLDocumentationFileName&gt;

These are accessible from the Source file Properties page in C/C++ -&gt; Output Files -&gt; &quot;Object File Name&quot; &amp; &quot;XML Documentation File Name&quot;.  But if I simply add the file directly (or remove and re-add them), VS doesn&#39;t complain until I try to compile, but also never adds the conditional directives -- So in order for things to work correctly, I have to add the conditional directives myself for every single configuration.  Am I making a mistake / poor assumption or have I uncovered a valid bug in VS 2008 / 2010?


Visual Studio 2010 &amp; 2008 can&#39;t handle source files with identical names in different folders?

Let&#39;s suppose that I need to store the number of foo objects in a variable.

Not being a native English speaker, I always wonder what&#39;s the best (= short and immediately clear) name for that var.

`foo_num`? `num_foo`? `no_foo`? `foo_no`? or something else?

The full name should be `number_of_foos`, but it&#39;s a bit verbose.

What&#39;s your favorite and why?

Naming conventions for &quot;number of foos&quot; variables

I like using question mark at the end of method/function names in other languages. Java doesn&#39;t let me do this. As a workaround how else can I name boolean returning methods in Java? Using an `is`, `has`, `should`, `can` in the front of a method sound okay for some cases. Is there a better way to name such methods?

For e.g. createFreshSnapshot? 






Naming conventions for Java methods that return boolean

I have an Android project created in [Eclipse][1]. I want to modify the package name and application of the project. How do I do that in Eclipse?

  [1]: http://en.wikipedia.org/wiki/Eclipse_%28software%29


How to change package name of Android Project in Eclipse?

I like the Java convention of having one public class per file, even if there are sometimes good reasons to put more than one public class into a single file. In my case I have alternative implementations of the same interface. But if I would place them into separate files, I&#39;d have redundant names in the import statements (or misleading module names):

    import someConverter.SomeConverter

whereas `someConverter` would be the file (and module) name and `SomeConverter` the class name. This looks pretty inelegant to me. To put all alternative classes into one file would lead to a more meaningful import statement:

    import converters.SomeConverter

But I fear that the files become pretty large, if I put all related classes into a single module file. What is the Python best practise here? Is one class per file unusual? 

Organizing Python classes in modules and/or packages

OK here&#39;s what I would like: in the Eclipse package explorer, I see the following: (dot represents a clickable arrow that I can use to expand the folder)

&lt;ul&gt;
&lt;li&gt;PROJECT
&lt;ul&gt;&lt;li&gt; Source Folder 
         &lt;ul&gt;&lt;li&gt;Package
&lt;ul&gt; Class &lt;/ul&gt;&lt;li&gt;Package.SubPackage&lt;ul&gt;Foo&lt;/ul&gt;&lt;ul&gt;Bar&lt;/ul&gt;&lt;li&gt;Package.OtherSubPackage&lt;li&gt;Package.OtherSubPackage.VerySubPackage
&lt;li&gt;OtherPackage &lt;ul&gt; Foobar &lt;/ul&gt;&lt;li&gt; OtherPackage.SubPackage
&lt;ul&gt; Baz&lt;/ul&gt;&lt;/ul&gt;&lt;/ul&gt;&lt;/ul&gt;&lt;/ul&gt;


Long story short, I want to have many packages, each with many subpackages, in a source folder (and several source folders, so making more won&#39;t solve the problem)--so on the order of a couple hundred packages per source folder--ten to twenty packages each with fifteen subpackages. Therefore, I want the hierarchy to look like this:

&lt;ul&gt;
&lt;li&gt;PROJECT
&lt;ul&gt;&lt;li&gt; Source Folder 
         &lt;ul&gt;&lt;li&gt;Package
&lt;ul&gt; Class
&lt;li&gt;Package.SubPackage
&lt;ul&gt; Foo&lt;/ul&gt;
&lt;ul&gt;Bar&lt;/ul&gt;&lt;li&gt;Package.OtherSubPackage&lt;ul&gt;&lt;li&gt;Package.OtherSubPackage.VerySubPackage&lt;/ul&gt;&lt;/ul&gt;&lt;/ul&gt;
&lt;ul&gt;&lt;li&gt;OtherPackage &lt;ul&gt; Foobar
&lt;li&gt; OtherPackage.SubPackage
&lt;ul&gt; Baz&lt;/ul&gt;&lt;/ul&gt;&lt;/ul&gt;&lt;/ul&gt;&lt;/ul&gt;


so I can open or close a package and see a list of subpackages instead of having package and subpackage all at the same level in the hierarchy--which again makes far too many packages simultaneously displayed. Note this is *not* a question about filesystem; the file system works fine as far as I can tell--it is only a question about the _visual display_ in the Eclipse package explorer.

So: is there a way to add levels to the hierarchy? Thanks!! (Eclipse Helios on OS X 10.6)

How to view hierarchical package structure in Eclipse package explorer

I installed [ImageMagick][1] via [Homebrew][2].

However, due to a bug I have with my current configuration, I need to adjust the compile flags for the formula and reinstall it.

How can I accomplish this?

  [1]: http://en.wikipedia.org/wiki/ImageMagick
  [2]: http://github.com/mxcl/homebrew



How do I modify a Homebrew formula?

I&#39;m wondering about the preferred way to import packages in a Python application. I have a package structure like this:

    project.app1.models
    project.app1.views
    project.app2.models

`project.app1.views` imports `project.app1.models` and `project.app2.models`. There are two ways to do this that come to mind.

With absolute imports:

    import A.A
    import A.B.B
or with explicit relative imports, as introduced in [Python 2.5 with PEP 328][1]:

    # explicit relative
    from .. import A
    from . import B

What is the most pythonic way to do this?

  [1]: http://docs.python.org/whatsnew/2.5.html#pep-328-absolute-and-relative-imports

Content Type	Original Author	Original Content on Stackoverflow
Question	corsiKa	View Question on Stackoverflow
Solution 1 - Java	Steve Turner	View Answer on Stackoverflow
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Solution 3 - Java	Jon Skeet	View Answer on Stackoverflow
Solution 4 - Java	Erick Robertson	View Answer on Stackoverflow
Solution 5 - Java	Dave B	View Answer on Stackoverflow

Hyphenated company name in Java packages

Java Problem Overview

Java Solutions

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Solution 3 - Java

Solution 4 - Java

Solution 5 - Java

`getchar()` gives the same output as the input string

T-SQL: Selecting Column Based on MAX(Other Column)

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