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ANTLR: Is there a simple example?
...message, and the files ExpLexer.java, ExpParser.java and Exp.tokens should now be generated.
To see if it all works properly, create this test class:
import org.antlr.runtime.*;
public class ANTLRDemo {
public static void main(String[] args) throws Exception {
ANTLRStringStream in = n...
Is it possible to download an old APK for my app from Google Play?
...ns to my app. Unfortunately, I didn't keep copies of all the old APKs, and now I'd like to test upgrade from the old versions to my new version. Is there any way to download Google's copy of my old versions? The Google Play developer console shows my old APKs, but without a download link. I tried "R...
Xcode Debugger: view value of variable
...a by clicking the upper-right corner button showed in the screenshot.
Now set a Breakpoint – the line in your code where you want your program to pause, by clicking the border of your Code Area.
Now in the Debug Area look for this buttons and click the one in the middle. You will notice yo...
How does the bitwise complement operator (~ tilde) work?
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How does the machine know it is getting a two complement negative number instead of a higher positive number? Is it because of the type system of the respective language indicating that the type is a signed int versus unsigned?
...
Get current time as formatted string in Go?
...
Use the time.Now() function and the time.Format() method.
t := time.Now()
fmt.Println(t.Format("20060102150405"))
prints out 20110504111515, or at least it did a few minutes ago. (I'm on Eastern Daylight Time.) There are several pre-de...
How to Generate unique file names in C#
... exists), I fall back to GUIDs.
Update:
Recently, I've also use DateTime.Now.Ticks instead of GUIDs:
var myUniqueFileName = string.Format(@"{0}.txt", DateTime.Now.Ticks);
or
var myUniqueFileName = $@"{DateTime.Now.Ticks}.txt";
The benefit to me is that this generates a shorter and "nicer loo...
What are enums and why are they useful?
...s (contract status: "permanent", "temp", "apprentice"), or flags ("execute now", "defer execution").
If you use enums instead of integers (or String codes), you increase compile-time checking and avoid errors from passing in invalid constants, and you document which values are legal to use.
BTW, o...
Can Android Studio be used to run standard Java projects?
...and click Next.
Fill in the package name, etc and click Finish. You should now see a Java module inside your Android project.
Add your code to the Java module you've just created.
Click on the drop down to the left of the run button. Click Edit Configurations...
In the new window, click on the plus ...
How to turn on front flash light programmatically in Android?
...rc code. here http://code.google.com/p/quick-settings/ (Note: This link is now broken)
For Flashlight directly look http://code.google.com/p/quick-settings/source/browse/trunk/quick-settings/#quick-settings/src/com/bwx/bequick/flashlight (Note: This link is now broken)
Update6
You could also try ...
SQL query return data from multiple tables
I would like to know the following:
6 Answers
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