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What does `kill -0 $pid` in a shell script do?
...l in Debian-based systems is:
Particularly useful signals include HUP, INT, KILL, STOP, CONT, and 0.
Not especially helpful, especially if you don't already know what the signal does. It is also not listed by the output of kill -l, so you won't know about it unless you already know about it.
...
What exceptions should be thrown for invalid or unexpected parameters in .NET?
...ngeException – I don’t use this one much, but a common use is indexing into a collection, and giving an index which is to large.
There are other options, too, that do not focus so much on the argument itself, but rather judge the call as a whole:
InvalidOperationException – The argument mi...
Access string.xml Resource File from Java Android Code
...using
String arr[] = getResources().getStringArray(R.array.planet);
for (int i = 0; i < arr.length; i++) {
Toast.makeText(getBaseContext(),arr[i], Toast.LENGTH_LONG).show();
}
share
|
...
How to create a private class method?
...ect model and the corresponding method lookup flow, especially when taking into consideration that private is NOT an access/visibility modifier, but actually a method call (with the class as its recipient) as discussed here... there's no such thing as "a private section" in Ruby.
To define private ...
What is Double Brace initialization in Java?
...ialiser block within that class (the inner braces). e.g.
new ArrayList<Integer>() {{
add(1);
add(2);
}};
Note that an effect of using this double brace initialisation is that you're creating anonymous inner classes. The created class has an implicit this pointer to the surrounding out...
Is there a more elegant way of adding an item to a Dictionary safely?
... One thing I think is worth noting that if you are storing an int, dict[key] += amount will not work if the key doesn't exist
– Chris S
Oct 1 '19 at 8:36
add a co...
Spring classpath prefix difference
...nf folders in all your jars on the classpath will be picked up and joined into one big application context.
In contrast, classpath:conf/appContext.xml will load only one such file... the first one found on your classpath.
...
Row count with PDO
... to issue a SELECT
COUNT(*) statement with the same
predicates as your intended SELECT
statement, then use
PDOStatement::fetchColumn() to
retrieve the number of rows that will
be returned. Your application can then
perform the correct action.
EDIT: The above code example uses a prepa...
Java JUnit: The method X is ambiguous for type Y
... ...
What this error means is that you're passing a double and and Double into a method that has two different signatures: assertEquals(Object, Object) and assertEquals(double, double) both of which could be called, thanks to autoboxing.
To avoid the ambiguity, make sure that you either call asser...
C++ : why bool is 8 bits long?
...Because every C++ data type must be addressable.
How would you create a pointer to a single bit? You can't. But you can create a pointer to a byte. So a boolean in C++ is typically byte-sized. (It may be larger as well. That's up to the implementation. The main thing is that it must be addressable,...