Check `Preferences / Java / Code Style / Code Template`

Section `Comment / Type`

You can replace the `author` tag by whatever value you need and it will have an effect on new generated classes.

![Code Templates][1]

----

However, if the template is fine, but the value referenced buy the author tag is not, see this [SO question][2]:

`${user}` uses the value of the `user.name` environment variable; therefore, you can pass `-Duser.name=My Name` in `eclipse.ini` to override it.

Or, if you prefer, you can modify the shortcut to point to:

    C:/java/eclipse/eclipse.exe -vmargs -Duser.name=&quot;cleverUserNameToUseInSourceCode&quot;

---

- MacOs: [Aram Kocharyan][3] [mentions][4] the `eclipse.ini` is in `Eclipse.app/Contents/MacOS/` if you right click and go Show Package Content.
- ZendStudio: [rofflox][5] [comments][6] the file is named `ZendStudio.ini` and is found in `Applications/Zend Studio.app/Contents/MacOS/`.


  [1]: http://i.stack.imgur.com/a3L6q.png
  [2]: https://stackoverflow.com/questions/935711/how-do-i-set-user-in-eclipse-to-get-the-correct-author-tag
  [3]: https://stackoverflow.com/users/549848/aram-kocharyan
  [4]: https://stackoverflow.com/questions/2612633/how-do-i-change-the-javadocs-template-generated-in-eclipse#comment15694930_2612688
  [5]: https://stackoverflow.com/users/764233/rofflox
  [6]: https://stackoverflow.com/questions/2612633/how-do-i-change-the-javadocs-template-generated-in-eclipse#comment24304614_2612688

Look at Window -&gt; Preferences -&gt; Java -&gt; Editor -&gt; Templates.

Spring Tool Suite (popular Eclipse customization for Spring development) uses STS.ini. On Windows I found it in the same dir as an app launch executable.

To use a Git username and email you can use the variables `${name:git_config(user.name)}` and
`${email:git_config(user.email)}`.

[![enter image description here][1]][1]


  [1]: http://i.stack.imgur.com/6U8XE.png

You should consider using [JAutodoc][1], which is a very useful plugin for Eclipse. The parametrization is way more advanced than the standard Eclipse generation.


  [1]: http://jautodoc.sourceforge.net/

In Scala, you often use an iterator to do a `for` loop in an increasing order like:

    for(i &lt;- 1 to 10){ code }

How would you do it so it goes from 10 to 1? I guess `10 to 1` gives an empty iterator (like usual range mathematics)?

I made a Scala script which solves it by calling reverse on the iterator, but it&#39;s not nice in my opinion, is the following the way to go?

    def nBeers(n:Int) = n match {

        case 0 =&gt; (&quot;No more bottles of beer on the wall, no more bottles of beer.&quot; +
                   &quot;\nGo to the store and buy some more, &quot; +
                   &quot;99 bottles of beer on the wall.\n&quot;)

        case _ =&gt; (n + &quot; bottles of beer on the wall, &quot; + n +
                   &quot; bottles of beer.\n&quot; +
                   &quot;Take one down and pass it around, &quot; +
                  (if((n-1)==0)
                       &quot;no more&quot;
                   else
                       (n-1)) +
                       &quot; bottles of beer on the wall.\n&quot;)
    }

    for(b &lt;- (0 to 99).reverse)
        println(nBeers(b))


Scala downwards or decreasing for loop?

Maybe I&#39;m just not seeing it, but CRC32 seems either needlessly complicated, or insufficiently explained anywhere I could find on the web.

I understand that it is the remainder from a non-carry-based arithmetic division of the message value, divided by the (generator) polynomial, but the actual implementation of it escapes me.

I&#39;ve read [A Painless Guide To CRC Error Detection Algorithms][1], and I must say it was not painless. It goes over the theory rather well, but the author never gets to a simple &quot;this is it.&quot; He does say what the parameters are for the standard CRC32 algorithm, but he neglects to lay out clearly how you get to it.

The part that gets me is when he says &quot;this is it&quot; and then adds on, &quot;oh by the way, it can be reversed or started with different initial conditions,&quot; and doesn&#39;t give a clear answer of what the final way of calculating a CRC32 checksum given all of the changes he just added.

- Is there a simpler explanation of how CRC32 is calculated?

I attempted to code in C how the table is formed:

    for (i = 0; i &lt; 256; i++)
    {
        temp = i;

        for (j = 0; j &lt; 8; j++)
        {
            if (temp &amp; 1)
            {
                temp &gt;&gt;= 1;
                temp ^= 0xEDB88320;
            }
            else {temp &gt;&gt;= 1;}
        }
        testcrc[i] = temp;
    }

but this seems to generate values inconsistent with values I have found elsewhere on the Internet. I **could** use the values I found online, but I want to understand how they were created.

Any help in clearing up these incredibly confusing numbers would be **very** appreciated.

  [1]: http://www.ross.net/crc/crcpaper.html

How is a CRC32 checksum calculated?

I dislike the default Javadocs generated for me when I create a Class or methods, especially the @author variable, which is the current system username on my windows box.

I would like to change it. Is this possible?

How do I change the Javadocs template generated in Eclipse?

<p>I dislike the default Javadocs generated for me when I create a Class or methods, especially the @author variable, which is the current system username on my windows box.</p>
<p>I would like to change it. Is this possible?</p>


I am using [CsvJdbc][1] (it is a JDBC-driver for csv-files) to access a csv-file. I don&#39;t know how many columns the csv-file contains. How can I get the number of columns? Is there any JDBC-function for this? I can not find any methods for this in java.sql.ResultSet.

For accessing the file, I use code similar to the [example][2] on the CsvJdbc website.

  [1]: http://sourceforge.net/projects/csvjdbc/
  [2]: http://csvjdbc.sourceforge.net/

How to get the number of columns from a JDBC ResultSet?


I saw some code like this:

		try
		{
			db.store(mydata);
		}
		finally
		{
			db.cleanup();
		}

I thought `try` is supposed to have a `catch`?

Why does this code do it this way?

Does it make sense to do &quot;try-finally&quot; without &quot;catch&quot;?

I am using a PreferenceActivity to show some settings for my application. I am inflating the settings via a xml file so that my onCreate (and complete class methods) looks like this: 

    public class FooActivity extends PreferenceActivity {
        @Override
        public void onCreate(Bundle icicle) {
            super.onCreate(icicle);
            addPreferencesFromResource(R.xml.preference);
        }
    }

The javadoc of &lt;s&gt;PreferenceActivity&lt;/s&gt; [PreferenceFragment][1] states that 

&gt; These preferences will automatically save to SharedPreferences as the user interacts with them. To retrieve an instance of SharedPreferences that the preference hierarchy in this activity will use, call getDefaultSharedPreferences(android.content.Context) with a context in the same package as this activity.

But how I get the name of the SharedPreference in another Activity? I can only call 

    getSharedPreferences(name, mode)

in the other activity but I need the name of the SharedPreference which was used by the PreferenceActivity. What is the name or how can i retrieve it?


  [1]: http://developer.android.com/reference/android/preference/PreferenceFragment.html

How do I get the SharedPreferences from a PreferenceActivity in Android?

    String match = &quot;hello&quot;;
    String text = &quot;0123456789hello0123456789&quot;;
    
    int position = getPosition(match, text); // should be 10, is there such a method?

Java: method to get position of a match in a String?

I have a program that tries to shrink a `double` down to a desired number. The output I get is `NaN`.

What does `NaN` mean in Java?

In Java, what does NaN mean?

Is there a CTRL+space -like way of &quot;auto-constructing&quot; a switch case around a given Java Enum in Eclipse? I&#39;d like a stub with all Enum cases...

Eclipse: Java Enum auto-completion of switch case

I won&#39;t want to have edit any working sets. I just want a way to, across all workspaces and projects, prevent .class files from ever showing in the Open Resource Dialog. Is there a way to do this?

How do I hide .class files from the Open Resource dialog in Eclipse?

I would like Eclipse to automatically save every time I edit a file, in much the same way that it builds automatically. Because I&#39;ve been using IntelliJ for the last year (which saves automatically by default), I keep having the following problem:

 - Make some changes in Eclipse
 - Forget to press save
 - Run the build, unit tests, and notice some strange behaviour
 - (Some time later....) realize that the unexpected behaviour occurred because I forgot to save the changes

Is there any way I can make Eclipse save automatically?



Eclipse save automatically

I have created several .java files. All of them are located in one directory. I used a text editor to write these files. Now I want to switch to Eclipse. How can I do it? I have tried many ways. None of them works.

**ADDED:**

I think the common way is to have source in the eclipse folder called &quot;workspace&quot;. So, how do I get my files in these directory. Should I use eclipse to create a new project from existing source and Eclipse will put all file to the workspace? Or I  should manually copy all my files to the workspace? Where should I put my class files than? Should I create a subdirectory? With which name?

**ADDED 2:**

When I try to create a project with name &quot;game&quot;, the eclipse writes me that a project with such name already exist. But how can I open this project?

**ADDED 3:**

In my &quot;workspace&quot; I have created a subdirectory called &quot;game&quot;. I copied all my .java file into this subdirectory. Then with Eclipse I created a new project with the name game. As a result, Eclipse created `.classpath` and `.project` files in the directory &quot;game&quot;. It also created `bin` and `src` subdirectories. And now I think it is not the correct way to go. The source files are supposed to be in the &quot;src&quot; directory. Right? And at the moment all my .java files are in the &quot;workspace\game&quot;.

**ADDED 4:**

I did it other way around. With Eclipse I have created a new project with the name &quot;game&quot;. As the result, Eclipse created a folder called &quot;game&quot; into folder &quot;workspace&quot;. In &quot;game&quot; the folder I found &quot;src&quot; folder. I copied all my .java files into this folder. But now in the &quot;Package Explorer&quot; I cannot open &quot;src&quot; folder. So, how can I access my source files from Eclipse? Why Eclipse does not want to open the &quot;src&quot; folder?

How to create a project from existing source in Eclipse and then find it?

I am trying to &quot;import existing project into workspace&quot;. As the &quot;root directory&quot; I select the directory where all my .java (and .class) files are located. Eclipse writes me that &quot;no projects are found to import&quot;. Why?

Why &quot;no projects found to import&quot;?

Can you tell me how to invoke template constructor explicitly (in initializer list)?
for example:

    struct T { 
        template&lt;class&gt; T();
    };
    
    struct U {
        U() : t&lt;void&gt;() {} //does not work
        T t;
    };

thanks




C++ invoke explicit template constructor

I have a class

    template&lt;size_t N, size_t M&gt;
    class Matrix {
        // ....
    };

I want to make a `typedef` which creates a `Vector` (column vector) which is equivalent to a `Matrix` with sizes N and 1. Something like that:

    typedef Matrix&lt;N,1&gt; Vector&lt;N&gt;;

Which produces compile error. The following creates something similar, but not exactly what I want:

    template &lt;size_t N&gt;
    class Vector: public Matrix&lt;N,1&gt;
    { };

Is there a solution or a not too expensive workaround / best-practice for it? 

C++ template typedef

I want to let a user sign in before seeing pages. Is there any built-in template for user sign in, so that I do not have to write my own sign in page?

Is there a built-in login template in Django?

How does the following code work?

    typedef char (&amp;yes)[1];
    typedef char (&amp;no)[2];
    
    template &lt;typename B, typename D&gt;
    struct Host
    {
      operator B*() const;
      operator D*();
    };
    
    template &lt;typename B, typename D&gt;
    struct is_base_of
    {
      template &lt;typename T&gt; 
      static yes check(D*, T);
      static no check(B*, int);
    
      static const bool value = sizeof(check(Host&lt;B,D&gt;(), int())) == sizeof(yes);
    };
    
    //Test sample
    class Base {};
    class Derived : private Base {};
    
    //Expression is true.
    int test[is_base_of&lt;Base,Derived&gt;::value &amp;&amp; !is_base_of&lt;Derived,Base&gt;::value];

1. Note that `B` is private base. How does this work? 

2. Note that `operator B*()` is const. Why is it important?

3. Why is `template&lt;typename T&gt; static yes check(D*, T);` better than `static yes check(B*, int);` ? 

**Note**: It is reduced version (macros are removed) of `boost::is_base_of`. And this works on wide range of compilers.

 


How does `is_base_of` work?

I&#39;m writing a script to automate creating configuration files for Apache and PHP for my own webserver. I don&#39;t want to use any GUIs like CPanel or ISPConfig.

I have some templates of Apache and PHP configuration files. Bash script needs to read templates, make variable substitution and output parsed templates into some folder. What is the best way to do that? I can think of several ways. Which one is the best or may be there are some better ways to do that? I want to do that in pure Bash (it&#39;s easy in PHP for example)

1) https://stackoverflow.com/questions/415677

template.txt:

    the number is ${i}
    the word is ${word}

script.sh:

    #!/bin/sh
    
    #set variables
    i=1
    word=&quot;dog&quot;
    #read in template one line at the time, and replace variables
    #(more natural (and efficient) way, thanks to Jonathan Leffler)
    while read line
    do
        eval echo &quot;$line&quot;
    done &lt; &quot;./template.txt&quot;

BTW, how do I redirect output to external file here? Do I need to escape something if variables contain, say, quotes?

2) Using cat &amp; sed for replacing each variable with its value:

Given template.txt:

    The number is ${i}
    The word is ${word}

Command:

    cat template.txt | sed -e &quot;s/\${i}/1/&quot; | sed -e &quot;s/\${word}/dog/&quot;

Seems bad to me because of the need to escape many different symbols and with many variables the line will be tooooo long.


Can you think of some other elegant and safe solution?


Bash Templating: How to build configuration files from templates with Bash?

If I write `&lt;xmlElement&gt;` in a javadoc, it does not appear, because tags have special functions on formatting texts.

How can I show this chars in a javadoc?

How can I use &quot;&lt;&quot; and &quot;&gt;&quot; in javadoc without formatting?

Is it correct practice to add Javadoc comments in the interface and add non-Javadoc comments in the implementation?

Most IDEs generate non-JavaDoc comments for implementations when you auto generate comments. Shouldn&#39;t the concrete method have the description?


Should Javadoc comments be added to the implementation?

I want to generate the javadocs for an open-source code-base I&#39;m using. But I&#39;m being asked for a &quot;Javadoc Command&quot; by the Eclipse Generate JavaDoc wizard and the help doesn&#39;t explain what this means. Is it wanting the path to the javadoc binary/jar or something else?

Eclipse Generate Javadoc Wizard: what is &quot;Javadoc Command&quot;?

I know that it isn&#39;t the most vital of issues, but I just realised that I can put the javadoc comment block before or after the annotation. What would we want to adopt as a coding standard?


    /**
     * This is a javadoc comment before the annotation 
     */
    @Component
    public class MyClass {

        @Autowired
        /**
         * This is a javadoc comment after the annotation
         */
        private MyOtherClass other;
    }

codestyle; put javadoc before or after annotation?

When trying to create package level Javadoc comments, whats the preferred method? What do you do?

**package-info.java**

 - Pros
  - Newer
 - Cons
  - Abuse of a class - Classes are for code, not for only comments

**package.html**

 - Pros
  - HTML extension means its not code
  - Syntax highlighting in IDE&#39;s/text editors
 - Cons
  - None?

---

For me, I&#39;ve always used Package.html. But I&#39;m wondering if its the correct choice. 


Content Type	Original Author	Original Content on Stackoverflow
Question	Olaseni	View Question on Stackoverflow
Solution 1 - Java	VonC	View Answer on Stackoverflow
Solution 2 - Java	Binil Thomas	View Answer on Stackoverflow
Solution 3 - Java	Alexey Slepov	View Answer on Stackoverflow
Solution 4 - Java	chrisjleu	View Answer on Stackoverflow
Solution 5 - Java	Julien	View Answer on Stackoverflow

How do I change the Javadocs template generated in Eclipse?

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How is a CRC32 checksum calculated?

Scala downwards or decreasing for loop?

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