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How to evaluate a math expression given in string form?
...es of operation orders. 1. operator sign | variable evaluation | function call | parenthesis (sub-expressions); 2. exponentiation; 3. multiplication, division; 4. addition, subtraction;
– Vasile Bors
Jul 24 '16 at 15:05
...
How to drive C#, C++ or Java compiler to compute 1+2+3+…+1000 at compile time?
... Collection<String> supportedOptions() {
System.err.println("Called supportedOptions.............................");
return Collections.EMPTY_LIST;
}
public Collection<String> supportedAnnotationTypes() {
System.err.println("Called supportedAnnotationType...
Convert java.util.Date to java.time.LocalDate
....Date instance has no concept of time-zone. This might seem strange if you call toString() on a java.util.Date, because the toString is relative to a time-zone. However that method actually uses Java's default time-zone on the fly to provide the string. The time-zone is not part of the actual state ...
Does a finally block always run?
...a
nonzero status code indicates abnormal
termination.
This method calls the exit method in
class Runtime. This method never
returns normally.
try {
System.out.println("hello");
System.exit(0);
}
finally {
System.out.println("bye");
} // try-fina...
How to source virtualenv activate in a Bash script
...
You should call the bash script using source.
Here is an example:
#!/bin/bash
# Let's call this script venv.sh
source "<absolute_path_recommended_here>/.env/bin/activate"
On your shell just call it like that:
> source venv...
What was the strangest coding standard rule that you were forced to follow? [closed]
...
OMG, are you kidding?
– Andrea Ambu
Feb 13 '09 at 14:17
21
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How to elegantly deal with timezones
... SO users and applications approach this? The most obvious part is that inside the DB, date/times are stored in UTC. When on the server, all date/times should be dealt with in UTC. However, I see three problems that I'm trying to overcome:
...
How to make a Python script run like a service or daemon in Linux
...
You have two options here.
Make a proper cron job that calls your script. Cron is a common name for a GNU/Linux daemon that periodically launches scripts according to a schedule you set. You add your script into a crontab or place a symlink to it into a special directory and th...
Hash String via SHA-256 in Java
...igest.getInstance("SHA-256");
String text = "Text to hash, cryptographically.";
// Change this to UTF-16 if needed
md.update(text.getBytes(StandardCharsets.UTF_8));
byte[] digest = md.digest();
String hex = String.format("%064x", new BigInteger(1, digest));
System.out.print...
Resolve absolute path from relative path and/or file name
...://docs.microsoft.com/en-us/windows-server/administration/windows-commands/call
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