Trying to understand what it is in java.  method? Thank you   static {     String xxx;     try {         xxx = new File(".").getCanonicalPath();     } catch (final IOException e) {         e.printStackTrace();        xxx = ".";     }
My question is about one particular usage of static keyword. It is possible to use static keyword to cover a code block within a class which does not belong to any function. For example following code compiles:  public class Test {     private static final int a;         static {         a = 5;         doSomething(a);     }     private static int doSomething(int x) {         return (x+5);     } }   If you remove the static keyword it complains because the variable a is final. However it is possible to remove both final and static keywords and make it compile.   It is confusing for me in both ways. How am I supposed to have a code section that does not belong to any method? How is it possible to invoke it? In general, what is the purpose of this usage? Or better, where can I find documentation about this?
What's a common interjection for the reaction to something creepy and disgusting (like some insects or spooky places, etc.)? A non-blocking read on a subprocess.PIPE in Python I'm using the  to start a subprocess and connect to its output stream (standard output). I want to be able to execute non-blocking reads on its standard output. Is there a way to make .readline non-blocking or to check if there is data on the stream before I invoke .readline? I'd like this to be portable or at least work under Windows and Linux. Here is how I do it for now (it's blocking on the .readline if no data is available): p = subprocess.Popen('myprogram.exe', stdout = subprocess.PIPE) output_str = p.stdout.readline() Using the code below I add text to end of file names which are:  1.mp3 2.mp3   and should be:  1text.mp3 2text.mp3   but it changed to:  1.mp3text 2.mp3text   Code:  @ECHO ON  FOR %%A IN ("C:\Users\user123\Desktop\mp3\*.mp2") DO (     CALL :RenameFiles "%%~A" "%%~NXA" ) GOTO EOF  :RenameFiles  SET fname=%~2 SET renname=%fname=% REN "%~1" "%renname%text%" GOTO E What is wrong with this proof?    Is $\pi=4?$ Convergence to a Uniform Distribution $\newcommand{\floor}[1]{\left\lfloor #1 \right\rfloor} $  Show that if $P(X_n = i/n)=1/n$ for every $i = 1,...,n$, then $X_n$ converges in distribution to a uniformly distributed random variable $X$.  Convergence in distribution is defined as   $$P(X_n \leq x) \rightarrow P(X \leq x)$$  and I have that a uniform distribution with parameters $a$ and $b$ implies that  $$P(X \leq x) = \frac{x-a}{b-a}$$  I cannot go any further however. I feel like I don't know anything about $X_n$ - I don't even know if it is continuous or discrete. What I can just say is that   $$P(X_n \leq x) = \sum_{i=1}^\floor{x} \frac{1}{n}$$  where $\floor{x}$  means rounding $x$ to the closest lower integer. I am working on an app that allows customers to upload images, video, (even gif) into my app. Once the case is processed on my app, I want to place those media files into Salesforce. I have a case record that I would this attached to.   I see multiple records can be added in Rest , and that files can be added to notes and attachments. Can I upload multiple notes and attachments in a single rest call? At what time will the upcoming Ubuntu release be made available? Every six months a new Ubuntu version will be released. Does anyone know at which time this will be? How can I apply an effect when a player left-clicks/right-clicks with an item in hand? mysqli_fetch_assoc() expects parameter / Call to a member function bind_param() errors. How to get the actual mysql error and fix it? How to remove Open CTI VF softphone page from salesforce left side Open CTI Softphone VF page is showing in salesforce left side. How to remove this ? Screenshot attached How to both display a command line's output on console and save the output into a text file? Can a Rogue (D&D 3.5) use sneak attack on both the first and second attack? I know this seems like a question you can simply Google but the answers vary and my clan is under the impression that I can only use it on my first attack (once per round) and not on my second attack.  From Googling, I've understood that as long as the monster / enemy is flat-footed, flanked or caught off-guard, I can apply sneak attack on both my first and second attack in a round.  Is this correct?  Is it normal if the clan simply decides that that gives me an unfair advantage in combat and gives me only one sneak attack per round? Salesforce - user trigger not invoked when user role changes There are two ways to change user role. One is from user detail page, which invoke user trigger. I am facing issue where if user role is changed from ROLE hierarchy screen, then user trigger is not being invoked.  Any body know if there is written documentation which specifies this? or is it just my ORG having some setting to skip user trigger?   Below is screenshot of the screen from where it happens. "Was going to" versus "would be" as the past tense of "will" Do you think that "was going to be" or "would be" could be used as past tense of will?     I thought this book was going to be your choice.        I thought this book would be your choice.   Do these two sentences basically mean the same thing or are they slightly different? I was studying a  problem where optical light with a wavelength of 500&nbsp;nm travels through a gas with refractive index $n$.  If we look at the equations for wave motion and index of refraction  $$c=\lambda_0\nu\quad\text{(in vacuum)}$$  $$v = \lambda\nu\quad\text{(in medium)}$$  $$n = c/v$$  we see that, if the frequency is constant, the wavelength decreases in the medium compared to vacuum. Is this a consistent property at all frequencies and for all mediums with refractive index real and greater than 1?  Are there dielectrics which change the frequency (still for n > 1), and is there an example of that? "Awesome" vs. "Awful" What is the best way to draw figures with canvas and set their angle? Can you win a game of Splendor if you still have cards in reserve? Lost space after removing bootcamp So I removed bootcamp and now there is a partition called "free space" that I can't remove.  Here is my output from diskutil list:    Here is the screenshot from disk utility showing the partitions:    And here is the error I get when I try to remove "free space":    Heres the output when I run   sudo diskutil apfs resizeContainer disk0s2 0 Possible Duplicate:          Here is a test case:   void foo(int i, int j) {    printf("%d %d", i, j); } ... test = 0; foo(test++, test);   I would expect to get a "0 1" output, but I get "0 0"  What gives??