Under &quot;Preferences&quot;:  Java &gt; Editor &gt; Save Actions

1) Check &quot;Additional actions&quot;

2) Click &quot;Configure…&quot;

3) Go to the &quot;Code Style&quot; tab

4) Check &quot;Use blocks in if/while/for/do statements&quot; and configure to your preferences


**Yes.**

Eclipse menu:  Source -&gt; Clean Up...

Configure... -&gt; Code Style -&gt; Use blocks in if/while/for/do statements.

In Eclipse Oxygen (2017+), that option is now at:

```Window
 -&gt; Preferences
 -&gt; Java
 -&gt; Code Style
 -&gt; Clean Up
 -&gt; Edit
 -&gt; second tab &quot;Code Style&quot;
```

After changing, select the corresponding parts of your code and run the &quot;Clean Up&quot; option.

This is what I did:   Eclipse -Preferences-Java-Code Style-Formatter-Edit-Braces Select next line as desired in each box then save as a different name (your choice).

I usually do it by creating a code formatter by copying the built in eclipse formatter, here:

    Windows &gt; Preferences &gt; Java &gt; Code Style &gt; Formatter 

Select the profile that you have just created. and click on Edit and go to &quot;Braces&quot; tab.

Change the braces placement as you like (it&#39;s a WYSIWYG kind of editor, makes it easy) .

When I need to format, I just select all the text and `Ctrl+Shift+F` and it works fine for me.

I am having an issue with this test function where I take an in memory string, compress it, and decompress it.  The compression works great, but I can&#39;t seem to get the decompression to work.


    //Compress
    System.IO.MemoryStream outStream = new System.IO.MemoryStream();                
    GZipStream tinyStream = new GZipStream(outStream, CompressionMode.Compress);
    mStream.Position = 0;
    mStream.CopyTo(tinyStream);
        
    //Decompress    
    outStream.Position = 0;
    GZipStream bigStream = new GZipStream(outStream, CompressionMode.Decompress);
    System.IO.MemoryStream bigStreamOut = new System.IO.MemoryStream();
    bigStream.CopyTo(bigStreamOut);

    //Results:
    //bigStreamOut.Length == 0
    //outStream.Position == the end of the stream.

I believe that bigStream out should at least have data in it, especially if my source stream (outStream) is being read. is this a MSFT bug or mine?

How do I use GZipStream with System.IO.MemoryStream?

What is the difference between `static` and `extern` in C?


What is the difference between static and extern in C?

In Java the following is completely valid:

    if (x == null)
        Y();
    else
        Z();

I personally don&#39;t like it at all. I like all my IF statements to have braces:

    if (x == null) {
        Y();
    } else {
        Z();
    }
The eclipse formatter is wonderful and can beautify my code in many other ways. 

Is there a way to have it add the braces to IF statements?


How to make eclipse automatically add braces to an IF statement?

In Java the following is completely valid:
<pre><code class="hljs language-scss">if (x == null)
 Y();
else
 Z();
</code></pre>
I personally don't like it at all. I like all my IF statements to have braces:
<pre><code class="hljs language-scss">if (x == null) {
 Y();
} else {
 Z();
}
</code></pre>
The eclipse formatter is wonderful and can beautify my code in many other ways.
Is there a way to have it add the braces to IF statements?

Java 6&#39;s `Arrays.sort` method uses Quicksort for arrays of primitives and merge sort for arrays of objects. I believe that most of time Quicksort is faster than merge sort and costs less memory. My experiments support that, although both algorithms are O(n log(n)). So why are different algorithms used for different types?

Why does Java&#39;s Arrays.sort method use two different sorting algorithms for different types?

I have a problem. I am trying to convert some strings to date, and I don&#39;t know the format the date is arriving.

It might come as `yyyy.mm.dd hh:mm:ss` or `MM.dd.yy hh:mm:ss` and so on.

How can I convert these strings to Date?
I tried this:

    DateFormat formatter = new SimpleDateFormat(&quot;dd-MM-yyyy hh:mm:ss&quot;);
    Date d = (Date)formatter.parse(someDate);

But when I printed out someDate it printed out like this: 2010-08-05 12:42:48.638 CEST which means `yyyy.mm.dd hh:mm:ss`, however when I ran the above code, the date object now became `Sat Jan 31 00:42:48 CET 11` which is strange to say the least.

Any ideas how I can correctly format strings to date?

How to convert String to Date without knowing the format?

The jar (bcprov-jdk16-145.jar) has been added to the project, `Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider())` has been added to the class, and `BouncyCastleProvider.PROVIDER_NAME` does return &quot;BC&quot; but AesFileIo.writeFile() still throws `java.security.NoSuchProviderException No such provider: BC`. Any ideas?

    import java.io.FileOutputStream;
    import java.io.InputStreamReader;
    import java.io.ObjectOutputStream;
    import javax.crypto.Cipher;
    import javax.crypto.spec.IvParameterSpec;
    import javax.crypto.spec.SecretKeySpec;
    import org.bouncycastle.jce.provider.BouncyCastleProvider;
    
    public class AesFileIo {
    
        private static final String AES_ALGORITHM = &quot;AES/CTR/NoPadding&quot;;
        private static final String PROVIDER = BouncyCastleProvider.PROVIDER_NAME;
        private static final byte[] AES_KEY_128 = { // Hard coded for now
            78, -90, 42, 70, -5, 20, -114, 103,
            -99, -25, 76, 95, -85, 94, 57, 54};
        private static final byte[] IV = { // Hard coded for now
            -85, -67, -5, 88, 28, 49, 49, 85,
            114, 83, -40, 119, -65, 91, 76, 108};
        private static final SecretKeySpec secretKeySpec =
                new SecretKeySpec(AES_KEY_128, &quot;AES&quot;);
        private static final IvParameterSpec ivSpec = new IvParameterSpec(IV);
    
        public void AesFileIo() {
            Security.addProvider(new org.bouncycastle.jce.provider
                    .BouncyCastleProvider());
        }
        
        public void writeFile(String fileName, String theFile) {
            try {
                Cipher cipher = Cipher.getInstance(AES_ALGORITHM, PROVIDER);
                cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec, ivSpec);
                byte[] encrypted = cipher.doFinal(theFile.getBytes());
                ObjectOutputStream os = new ObjectOutputStream(
                    new FileOutputStream(fileName));
                os.write(encrypted);
                os.flush();
                os.close();
            } catch (Exception e) {
                StackTraceElement se = new Exception().getStackTrace()[0];
                System.err.println(se.getFileName() + &quot; &quot; + se.getLineNumber()
                        + &quot; &quot; + e);
            }
        }
    }



Why java.security.NoSuchProviderException No such provider: BC?

In Java, What is the difference with or without `System.exit(0)` in following code? 

    public class TestExit
    {      
        public static void main(String[] args)
        { 
            System.out.println(&quot;hello world&quot;);
 
            System.exit(0);  // is it necessary? And when it must be called? 
        }      
    }

The [document][1] says: &quot;This method never returns normally.&quot; What does it mean? 


  [1]: 
http://docs.oracle.com/javase/7/docs/api/java/lang/System.html#exit(int)

When should we call System.exit in Java

I&#39;m testing a method that logs warnings when something went wrong and returns null.  
something like:  

    private static final Logger log = Logger.getLogger(Clazz.class.getName());
    ....
    if (file == null || !file.exists()) {
      // if File not found
      log.warn(&quot;File not found: &quot;+file.toString());
    } else if (!file.canWrite()) {
      // if file is read only
      log.warn(&quot;File is read-only: &quot;+file.toString());
    } else {
      // all checks passed, can return an working file.
      return file;
    }
    return null;

i&#39;d like to test with junit that a warning was issued, in addition to returning null, in all cases (e.g. file not found, file is read-only).  
any ideas?  
thanks, asaf :-)


----------
### UPDATE ###
My implementation of Aaron&#39;s answer (plus peter&#39;s remark):  

    public class UnitTest {
    ...
    
    @BeforeClass
    public static void setUpOnce() {
      appenders = new Vector&lt;Appender&gt;(2);
      // 1. just a printout appender:
      appenders.add(new ConsoleAppender(new PatternLayout(&quot;%d [%t] %-5p %c - %m%n&quot;)));
      // 2. the appender to test against:
      writer = new StringWriter();
      appenders.add(new WriterAppender(new PatternLayout(&quot;%p, %m%n&quot;),writer));
    }
  
    @Before
    public void setUp() {
      // Unit Under Test:
      unit = new TestUnit();
      // setting test appenders:
      for (Appender appender : appenders) {
        TestUnit.log.addAppender(appender);
      }
      // saving additivity and turning it off:
      additivity = TestUnit.log.getAdditivity();
      TestUnit.log.setAdditivity(false);
    }
  
    @After
    public void tearDown() {
      unit = null;
      for (Appender appender : appenders) {
        TestUnit.log.removeAppender(appender);
      }
      TestUnit.log.setAdditivity(additivity);
    }
  
    @Test
    public void testGetFile() {
      // start fresh:
      File file;
      writer.getBuffer().setLength(0);
  
      // 1. test null file:
      System.out.println(&quot; 1. test null file.&quot;);
      file = unit.getFile(null);
      assertNull(file);
      assertTrue(writer.toString(), writer.toString().startsWith(&quot;WARN, File not found&quot;));
      writer.getBuffer().setLength(0);
  
      // 2. test empty file:
      System.out.println(&quot; 2. test empty file.&quot;);
      file = unit.getFile(&quot;&quot;);
      assertNull(file);
      assertTrue(writer.toString(), writer.toString().startsWith(&quot;WARN, File not found&quot;));
      writer.getBuffer().setLength(0);
    }


thanks guys,

How can I test with junit that a warning was logged with log4j?

Okay. I&#39;m sick of this problem.  This *has to* have an easy fix, I&#39;m sure of it!! I hope SO can help me to get rid of this once and for all!

&gt; **Question**
&gt; 
&gt; How do we get Eclipse to stop trying
&gt; to process/compile all files under a
&gt; particular project directory?  The
&gt; goal is for no errors/warnings to
&gt; exist in the problems view if they
&gt; relate to something in this folder or it&#39;s subfolders.

**Background**

We run Eclipse 3.6 and the m2eclipse plugin v0.10.2.20100623 manages our autobuild. For reasons beyond my control, we have the entire BlazeDS distribution in our SVN project directory under `src/main/resources/blazeds`.  Essentially, this directory contains a vanilla distribution of tomcat running blazeds to which all our configuration and project files are added when we deploy to our server via SCP.

So, when we run deploy, this version of tomcat is copied to the server and our project is placed inside.  Tomcat and our RIA application work and everything is fine.

The problem is, Eclipse tries to compile everything under `src/main/resources/blazeds` when running AutoBuild and this generates about 300 errors/warnings in our problem view.  So when a real error surfaces, it gets lost among the noise.

  The errors stem from code in `/blazeds/tomcat/webapps/samples/testdrive-datapush` and also the `testdrive-httpservice`, `traderdesktop` example webapps. They have dependent source code that&#39;s not on the classpath and jars that aren&#39;t included in the libraries.

**Failed Attempted Solutions**

I&#39;m trying to push the proper solution: to remove the samples completely and also to get blazeds out of our version control.  That&#39;s not happening anytime soon.

I&#39;ve followed the [SO answer here][1] but it&#39;s only a very temporary solution.  I&#39;ve tried adding exclusions everywhere I can think of and other members of my team have done the same.  I&#39;ve removed `src/main/resources` as a source directory (in preferences &gt; Java Build Path &gt; Source Tab) I&#39;ve added exclusions for `blazeds` under the resource directory.  I&#39;ve tried every permutation of `blazeds` and `**` as in `*blazeds*`, `**/blazeds/**`, etc.

I&#39;ve even tried including the libraries and source files the compiler is complaining about but I couldn&#39;t get it right without excessively mangling our project configuration.

&gt; **Summary**
&gt; 
&gt; This has to be simple. What is the
&gt; conventional way to exclude a folder
&gt; that is producing warnings/errors in
&gt; an eclipse project?
&gt;
&gt; &lt;hr&gt;
&gt; ***Update #1:*** &lt;br&gt;
&gt; gedim&#39;s solution below is decent but it&lt;br&gt;
&gt; 1) doesn&#39;t clear red X&#39;s from the project&lt;br&gt;
&gt; 2) is a change everyone on our team needs to do, manually&lt;br&gt;(i.e., it&#39;s not in a project property file; thereby, it isn&#39;t checked into subversion)&lt;br&gt;
&gt;&lt;br&gt;
&gt; I hope there&#39;s a way to address the core problem by telling Eclipse that this directory doesn&#39;t contain&lt;br&gt;
&gt; items to compile/validate. Such a change would likely show up in one of the project setting files.
&gt;

&lt;hr&gt;
**Update #2:**

The picture below shows the red X&#39;s I&#39;m trying to clear and that&lt;br&gt;
`Build Path &gt; Exclude` &lt;br&gt; isn&#39;t an option...

![Red X&#39;s won&#39;t go away][2]


  [1]: https://stackoverflow.com/questions/2514296/how-do-i-remove-error-warnings-made-by-tpl-files-in-my-eclipse-project
  [2]: http://i.stack.imgur.com/auYdR.gif

How to exclude a folder that is producing warnings/errors in an Eclipse project?

Whenever I add a new html file (or other text file) to the project its encoding is set to Cp1250. I am not sure why, I guess this is probably because my default language in Windows is Polish and I don&#39;t want to change it. Anyway, Eclipse says that Cp1250 is a &#39;default&#39; encoding and I have to manually change it to UTF-8 each time I add anything.

So where can I change the default encoding to UTF-8? I&#39;ve set the encoding by right-clicking on whole project but it didn&#39;t help. I can&#39;t find anything in options. It&#39;s so annoying...

I&#39;m using &#39;Helios&#39; release of the eclipse and use it with pydev if that matters.

How to change default text file encoding in Eclipse?

How to search for occurrences of more than one space between words in a line

```none
1. this is a line containing  2 spaces
2. this is a line containing   3 spaces
3. this is a line containing multiple spaces first  second   three   four
```

All the above are valid matches for this regex. What regex should I use?


How to search for occurrences of more than one space between words in a line

Using Eclipse, when debugging is it possible to change the value of variables during runtime of a project for testing purposes.

For example, say I have a method that returns the number 5 but for testing purposes i want to output 10 instead. This isn&#39;t the problem I&#39;m facing its a little more complex but its just to get my idea across.


Changing variables in realtime when debugging in eclipse?

I am starting to develop Android applications. Which version of Eclipse should I use?

I see there are 11 versions. I am confused with these:

 1. Eclipse IDE for Java Developers
 2. Eclipse Classic 3.6.1
 3. Eclipse IDE for Java EE Developers
 4. Pulsar for Mobile Developers


Which Eclipse version should I use for an Android app?

In Visual Studio while designing MVC views (in `.aspx` or `.ascx` files), I often use `if` statements. When I auto-format (&lt;kbd&gt;Ctrl&lt;/kbd&gt;+&lt;kbd&gt;K&lt;/kbd&gt;+&lt;kbd&gt;D&lt;/kbd&gt;), Visual Studio wraps the braces in this really ugly and hard to read way:

```aspx
&lt;% if (Model.UserIsAuthenticated)
    { %&gt;
       (some HTML goes here...)
&lt;% } %&gt;
```

Is there any way to make Visual Studio auto-format like this instead:

```csharp
&lt;% if (Model.UserIsAuthenticated) { %&gt;
       (some HTML goes here...)
&lt;% } %&gt;
```

Or is there a better way to do this? I don&#39;t want to use Razor quite yet, but it looks like it would solve my problem. I&#39;m using VS2010 with Resharper 5, if that helps.

Can I make Visual Studio place curly braces on the same line as an if statement (in HTML)?

What do the curly braces surrounding JavaScript arguments for functions do? 

    var port = chrome.extension.connect({name: &quot;testing&quot;});
    port.postMessage({found: (count != undefined)});



Curly braces inside JavaScript arguments for functions

Is there an advantage or disadvantage to concatenating variables within strings or using curly braces instead?

**Concatenated:**

    $greeting = &quot;Welcome, &quot; . $name . &quot;!&quot;;

**Curly braces:**

    $greeting = &quot;Welcome, {$name}!&quot;;

Personally, I&#39;ve always concatenated my strings, because I use [UEStudio][1], and it highlights PHP variables with a different color when concatenated. However, when the variable is not broken out, it does not. It just makes it easier for my eyes to find PHP variables in long strings, etc.

&lt;sub&gt;*People are confusing this about being about SQL. This is* ***not*** *what this question is about. I&#39;ve updated my examples to avoid confusion.*&lt;/sub&gt;

  [1]: https://en.wikipedia.org/wiki/UltraEdit#UEStudio




Should I use curly brackets or concatenate variables within strings?

Non-working example:

    print(&quot; \{ Hello \} {0} &quot;.format(42))

Desired output:

```none
 {Hello} 42 
```

How do I print curly-brace characters in a string while using .format?

Something that really would like to know but never found out are shortcuts in PHP.

I am currently coding a function with a `foreach` loop with just a single statement inside. I tried to omit the curly braces as you can do in if/else control structures and it works. No errors.

    foreach($var as $value)
    	$arr[] = $value;

Now I tried to use it the same way but putting an if/else block inside it. Again, working and no errors.

    foreach($var as $value)
    	if(1 + 1 == 2) {
    		$arr[] = $value;
    	};

Then, I thought like &quot;why is this working?&quot; and omitted the closing semicolon. Still working. So I tried to use the if/else statement without curly braces inside the foreach loop and again, still working and no errors. But is the foreach loop really closed/ended right now?

    foreach($var as $value)
    	if(1 + 1 == 2)
    		$arr[] = $value;

At least I omitted the closing semicolon again and (as expected) a parsing error occurred.

So my big question is: When can I omit the curly braces and in which structure/loop/function? I know that I can definitely do so in `if` and `else`. But what about `while`, `for` and `foreach`?

And yes, I know that it is not safe, smart, whatever to code without curly braces and there are shorthands like `$condition ? true : false;` and `if: doSomething(); endif;`, `endfor;` and `endforeach;`. I don&#39;t wanna learn about shorthands I just want to understand the conditions about when and where it is possible to omit the curly brackets.

Content Type	Original Author	Original Content on Stackoverflow
Question	Bromide	View Question on Stackoverflow
Solution 1 - Java	gk5885	View Answer on Stackoverflow
Solution 2 - Java	ChrisH	View Answer on Stackoverflow
Solution 3 - Java	user1050755	View Answer on Stackoverflow
Solution 4 - Java	Peter	View Answer on Stackoverflow
Solution 5 - Java	Ayusman	View Answer on Stackoverflow

How to make eclipse automatically add braces to an IF statement?

Java Problem Overview

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Solution 5 - Java

What is the difference between static and extern in C?

How do I use GZipStream with System.IO.MemoryStream?

Attributions