Tested, for the 7.1.1 version, it is ALT+LEFT.

Another useful shortcut is `ctrl-q` which takes you to the last edit point. 

Navigate back :**(ALT+LEFT)** 

Navigate forward :**(ALT+RIGHT)** 

For El Capitan one needs to go to the System Preferences -&gt; Keyboard -&gt; Shortcuts and under &quot;Mission Control&quot; disable the ctrl-arrow sequences and then it works 

For **El Capitan** I was not able to figure this out.

So instead I applied my own keybinding.

Go to *Netbeans -&gt; preferences -&gt; keymap*

Search for &quot;back&quot; and add your own keybinding.

Cheers :)

I think you are looking for `Alt-K`

In the menu this is `Navigate --&gt; Back`

Tested for Netbeans 8.2 on MAC, it is ctrl+B.

I think you should try:
**Control + W**

**Command + W** on MAC 


I like to give helpful errors / messages, and I also want to do so for my `static_assert`s. The problem is, that they depend on template parameters. Normally, those parameters will get displayed on way or an other due to the error raised, but they are either obscure or not grouped so they make sense. Example:

    template&lt;class T&gt;
    struct fake_dependency{
      static bool const value = false;
    };
    
    template&lt;class T, class Tag&gt;
    struct Foo{
      Foo(){}

      template&lt;class OtherTag&gt;
      Foo(Foo&lt;T, OtherTag&gt; const&amp;){
        static_assert(fake_dependency&lt;T&gt;::value, &quot;Cannot create Foo&lt;T,Tag&gt; from Foo&lt;T,OtherTag&gt;.&quot;);
      }
    };

    int main(){
        Foo&lt;int, struct TagA&gt; fA;
        Foo&lt;int, struct TagB&gt; fB(fA);
    }

Output on MSVC:

    src\main.cpp(74): error C2338: Cannot create Foo&lt;T,Tag&gt; from Foo&lt;T,OtherTag&gt;.
              src\main.cpp(84) : see reference to function template instantiation &#39;Foo&lt;T,Tag&gt;::Foo&lt;main::TagA&gt;(const Foo&lt;T,main::TagA&gt; &amp;)&#39; being compiled
              with
              [
                  T=int,
                  Tag=main::TagB
              ]
One tag is mentioned in the function template itself, the other below with the class template. Not so nice. Lets see what [GCC outputs][1]:

    prog.cpp: In constructor &#39;Foo&lt;T, Tag&gt;::Foo(const Foo&lt;T, OtherTag&gt;&amp;) [with OtherTag = main()::TagA, T = int, Tag = main()::TagB]&#39;:
    prog.cpp:18:32:   instantiated from here
    prog.cpp:12:5: error: static assertion failed: &quot;Cannot create Foo&lt;T,Tag&gt; from Foo&lt;T,OtherTag&gt;.&quot;

Much better, but still not really where the `static_assert` is. And now imagine some more parameters, or more templates, or both. *shivers*

One way to work around that is to use an intermediate struct, which takes both Tags as template parameters:

    template&lt;class Tag, class OtherTag&gt;
    struct static_Foo_assert{
        static_assert(fake_dependency&lt;Tag&gt;::value, &quot;Cannot create Foo&lt;T,Tag&gt; from Foo&lt;T,OtherTag&gt;.&quot;);
    };

    template&lt;class T, class Tag&gt;
    struct Foo{
      Foo(){}
    
      template&lt;class OtherTag&gt;
      Foo(Foo&lt;T, OtherTag&gt; const&amp;){
          static_Foo_assert&lt;Tag, OtherTag&gt; x;
      }
    };
Now lets see the output again:

    src\main.cpp(70): error C2338: Cannot create Foo&lt;T,Tag&gt; from Foo&lt;T,OtherTag&gt;.
              src\main.cpp(79) : see reference to class template instantiation &#39;static_Foo_assert&lt;Tag,OtherTag&gt;&#39; being compiled
              with
              [
                  Tag=main::TagB,
                  OtherTag=main::TagA
              ]
Much better! Here&#39;s what [GCC says][2]:

    prog.cpp: In instantiation of &#39;static_Foo_assert&lt;main()::TagB, main()::TagA&gt;&#39;:
    prog.cpp:17:40:   instantiated from &#39;Foo&lt;T, Tag&gt;::Foo(const Foo&lt;T, OtherTag&gt;&amp;) [with OtherTag = main()::TagA, T = int, Tag = main()::TagB]&#39;
    prog.cpp:23:32:   instantiated from here
    prog.cpp:8:5: error: static assertion failed: &quot;Cannot create Foo&lt;T,Tag&gt; from Foo&lt;T,OtherTag&gt;.&quot;

Looks not bad. The problem: I need to create such a struct for every template, since the error message in `static_assert` needs to be a string literal...

Now, for my question: Can we somehow include the type names directly into the `static_assert`? Like

    static_assert(..., &quot;Cannot create Foo&lt;&quot; T &quot;,&quot; Tag &quot;&gt; from Foo&lt;&quot; T &quot;,&quot; OtherTag &quot;&gt;.&quot;);
Example output:
&gt;Cannot create `Foo&lt;int,main::TagA&gt;` from `Foo&lt;int,main::TagB&gt;`.

Or, if that isn&#39;t achievable, can we somehow make the error message an extra template parameter, as to make it passable?


  [1]: http://ideone.com/ElIm1
  [2]: http://ideone.com/pHLAq

Integrate type name in static_assert output?

According to answer to this [question](https://stackoverflow.com/questions/1704607/difference-between-yield-in-python-and-yield-in-c), `yield break` in C# is equivalent to `return` in Python. In the normal case, `return` indeed stops a generator. But if your function does nothing but `return`, you will get a `None` not an empty iterator, which is returned by `yield break` in C#

    def generate_nothing():
        return

    for i in generate_nothing():
        print i

You will get a `TypeError: &#39;NoneType&#39; object is not iterable`,
but if I add and never run `yield` before `return`, this function returns what I expect.

    def generate_nothing():
        if False: yield None
        return

It works, but seems weird. Do you have a better idea?

yield break in Python

In Netbeans I want to be able too return back to my previous position after selecting `Go to Declaration` (`ctrl + click` on variable). Similar to the option in Microsoft Visual Studio .Net IDE when I click (`ctrl + -`) - it will return to the previous position I was in.



NetBeans - shortcut for returning to previous position after invoking &#39;Go to Declaration&#39;

<p>In Netbeans I want to be able too return back to my previous position after selecting <code>Go to Declaration</code> (<code>ctrl + click</code> on variable). Similar to the option in Microsoft Visual Studio .Net IDE when I click (<code>ctrl + -</code>) - it will return to the previous position I was in.</p>


Is the Userprincipal I retrieve from `SecurityContextHolder` bound to requests or to sessions?

`UserPrincipal principal = (UserPrincipal) SecurityContextHolder.getContext().getAuthentication().getPrincipal();`

This is the way I access the currently logged in user. Will this invalidate if the current session is destroyed?

Spring security&#39;s SecurityContextHolder: session or request bound?

I want to choose a random item from a set, but the chance of choosing any item should be proportional to the associated weight

Example inputs:

    item                weight
    ----                ------
    sword of misery         10
    shield of happy          5
    potion of dying          6
    triple-edged sword       1


So, if I have 4 possible items, the chance of getting any one item without weights would be 1 in 4.

In this case, a user should be 10 times more likely to get the sword of misery than the triple-edged sword.

How do I make a weighted random selection in Java?

Random weighted selection in Java

I am trying to create some JUnit tests for a method that requires user input. The method under test looks somewhat like the following method:


    public static int testUserInput() {
		Scanner keyboard = new Scanner(System.in);
		System.out.println(&quot;Give a number between 1 and 10&quot;);
		int input = keyboard.nextInt();

		while (input &lt; 1 || input &gt; 10) {
			System.out.println(&quot;Wrong number, try again.&quot;);
			input = keyboard.nextInt();
		}

		return input;
	}

Is there a possible way to automatically pass the program an int instead of me or someone else doing this manually in the JUnit test method? Like simulating the user input? 

Thanks in advance.


JUnit testing with simulated user input

In my application I use 3rd party library (Spring Data for MongoDB to be exact).

Methods of this library return `Iterable&lt;T&gt;`, while the rest of my code expects `Collection&lt;T&gt;`.

Is there any utility method somewhere that will let me quickly convert one to the other? I would like to avoid creating a bunch of `foreach` loops in my code for such a simple thing.


Easy way to convert Iterable to Collection

I am converting my selenium 1 code to selenium 2 and can&#39;t find any easy way to select a label in a drop down menu or get the selected value of a drop down. Do you know how to do that in Selenium 2?

Here are two statements that work in Selenium 1 but not in 2:

    browser.select(&quot;//path_to_drop_down&quot;, &quot;Value1&quot;);
    browser.getSelectedValue(&quot;//path_to_drop_down&quot;);



How to select/get drop down option in Selenium 2

Is it possible, when you mouse hover on method/class so you can see Javadoc in NetBeans 7?

I want similar to Eclipse, when you just mouse hover on `String` and you can read Java API documentation about it.

Maybe there is some hot key for that...

How to see Javadoc documentation on mouse hover in NetBeans?

I have the older NetBeans 6.7, NetBeans 6.9, and NetBeans 7.0, which used to run on jdk1.6.0_21 and jdk1.6.0_25. Now I&#39;ve removed those JDKs and only have jdk1.6.0_26 and jdk1.7.0 left, but I still want to keep the older versions of NetBeans, but now when I run them, I get this message:

&gt; &quot;Cannot locate java installation in specified jdkhome C:\Program Files (x86)\Java\jdk1.6.0_25 \
&gt; Do you want to try to use default version?&quot;

I tried to find where it&#39;s looking for the &quot;jdk1.6.0_25&quot;, and updated a few configuration files in &quot;C:\Program Files (x86)\NetBeans 6.7&quot; and &quot;C:\Users\USER\.nbi\registry.xml&quot;, and yet the message keeps coming. Where and what do I need to change to point it to `C:\Program Files (x86)\Java\jdk1.6.0_26`?




How can I set the JDK NetBeans runs on?

I am developing a front end of a web app using NetBeans IDE 7.0.1. Recently I had a very nasty bug, which I finally fixed.

Say I have code

    var element = &#39;&lt;input size=&quot;3&quot; id=&quot;foo&quot; name=&quot;elements[foo][0]&quot; /&gt;&#39;;
    $(&#39;#bar&#39;).append(element);

I noticed that something gone wrong when I saw that `size` attribute doesn&#39;t work in Chrome (didn&#39;t checked in other browsers). When I opened that element in Inspector, it was interpreted as something like

    &lt;input id=&quot;&amp;quot;3&amp;quot;&quot; name=&quot;&amp;quot;elements[foo][0]&amp;quot;&quot; 
        size=&quot;&amp;quot;foo&amp;quot;&quot; /&gt;

Which was rather strange. After manually retyping the `element` string character-in-character, the bug was gone. When I undo&#39;ed that change I noticed that Netbeans alerted me about some Unicode characters in my old code. It was `\u200b` - a zero width spaces after each &#39;=&#39;, between &#39;][&#39; and in the end of the string. So the string appeared normal because zero width spaces wasn&#39;t displayed, but after escaping them my string was

    &#39;&lt;input size=\u200b&quot;3&quot; id=\u200b&quot;foo&quot; name=\u200b&quot;elements[foo]\u200b[0]&quot; /&gt;\u200b&#39;

Now where the hell did I get them?

I&#39;m not sure where did I copied the code of `element` from, but it&#39;s definitely one of the following:

 - Other pane of Netbeans Editor with HTML template file;
 - Google Chrome Inspector, &#39;Copy as HTML&#39; action;
 - Google Chrome source view page (very doubtfully).

But I can&#39;t reproduce the bug with neither of that.

I use Netbeans 7.0.1 and Google Chrome 13.0 under Windows 7. No keyboard switchers or anything like it is running. Also I&#39;m using Git for version control, but I didn&#39;t pulled that code, so it is very unlikely that Git is to blame. It can&#39;t be a stupid joke of my colleagues, because they are quite well-mannered.

Any suggestions who messed up my code?

\u200b (Zero width space) characters in my JS code. Where did they come from?

I am unsure of how to code popup message box in my methods.

    public String verify(){
        String result = &quot;failed&quot;;
        int authcode = staffBean.getVerifyCodeByName(getLoginUserName());
       
        if (code == authcode){       
            result =&quot;success&quot;;
        }    
        else{ //statement to popup an error message box
    
        }
        return result;
    }

I have tried to use `JOptionPane` in my method but it does not work:

    String st = &quot;Welcome&quot;;
    JOptionPane.showMessageDialog(null, st);


Popup Message boxes

From today, when I tried to run an app in NetBeans on a 2.3.3 Android platform, it shows me that:

&gt;Failed to allocate memory: 8
&gt;
&gt;This application has requested the Runtime to terminate it in an unusual way.
&gt;Please contact the application&#39;s support team for more information.

and the Emulator doesn&#39;t want to start.

This is for the first time when I see it, and google has no asnwers for this, I tried even with 2 versions of NetBeans 6.9.1 and 7.0.1, still the same error.

Failed to allocate memory: 8

I have opened many tabs while working on project. (new feature in Xcode 4).

But for switching from one tab to other tab, the only way I&#39;ve found to do this is to use the mouse. Is there any way to switch between different tabs using keyboard shortcuts?


What is the way to quick-switch between tabs in Xcode 4

I wonder how can I format my code to align it neatly? Does it have a feature similar to Eclipse&#39;s &lt;kbd&gt;ctrl&lt;/kbd&gt;&lt;kbd&gt;shift&lt;/kbd&gt;&lt;kbd&gt;f&lt;/kbd&gt;?


How to format code in Xcode?

How do I make a lowercase string uppercase using Eclipse? I want to select a string and either uppercase it or lowercase it. Is there a shortcut for doing this?

Changing the case of a string in Eclipse

Is there a keyboard shortcut to move to the beginning of a file? I checked IntelliJ&#39;s [Keymap for Mac OS X][1] and it doesn&#39;t list anything for navigating to the start of a file.


  [1]: http://www.jetbrains.com/idea/documentation/index.jsp

IntelliJ beginning of file keyboard shortcut

I am working on a new `Android` project (`Java`), and created an Object with a large number of variables. Since I am planning to add getters and setters for all of them, I was wondering: is there a shortcut in `Eclipse` for automatically generating the getters and setters in a given class?

Content Type	Original Author	Original Content on Stackoverflow
Question	ehab	View Question on Stackoverflow
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Solution 8 - Java	azibit	View Answer on Stackoverflow

NetBeans - shortcut for returning to previous position after invoking 'Go to Declaration'

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yield break in Python

Integrate type name in static_assert output?

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