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How to synchronize a static variable among threads running different instances of a class in Java?
... synchronizes on the class object.
public class Test {
private static int count = 0;
public static synchronized void incrementCount() {
count++;
}
}
Explicitly synchronize on the class object.
public class Test {
private static int count = 0;
public void incrementCo...
Statistics: combinations in Python
...hout taking much time. In the exact case it returns an arbitrary-precision integer, which might take a long time to compute.
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Why use the SQL Server 2008 geography data type?
...lDegrees = 1
Begin
set @X = 1
END
Else
Begin
set @X = 24
End
-- convert to decimal degrees
set @Lat1 = @Latitude1 * @X
set @Long1 = @Longitude1 * @X
set @Lat2 = @Latitude2 * @X
set @Long2 = @Longitude2 * @X
-- convert to radians: radians = (degrees/180) * PI
set @Lat1 = (@Lat1 / 180) * @...
java: ArrayList - how can i check if an index exists?
...is is what you need ...
public boolean indexExists(final List list, final int index) {
return index >= 0 && index < list.size();
}
Why not use an plain old array? Indexed access to a List is a code smell I think.
...
Reusable library to get human readable version of file size?
...l this iteration on this "too small a task" were captured and encapsulated into a library with tests.
– fess .
Feb 27 '16 at 22:03
6
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Optimising Android application before release [closed]
...
At some point you are going to get to the point where using known tricks will hit their limits. The best thing to do at this point is profile your code and see what areas are the bottle-necks based on your specific requirements.
Inves...
How can I create tests in Android Studio?
Just downloaded Android Studio which is based off of the Intellij Idea.
12 Answers
12
...
Conveniently Declaring Compile-Time Strings in C++
...require constexpr though.
Here's how you can use it, and what it can do:
int
main()
{
constexpr str_const my_string = "Hello, world!";
static_assert(my_string.size() == 13, "");
static_assert(my_string[4] == 'o', "");
constexpr str_const my_other_string = my_string;
static_asse...
What is the difference between const and readonly in C#?
...lass defined in AssemblyA.
public class Const_V_Readonly
{
public const int I_CONST_VALUE = 2;
public readonly int I_RO_VALUE;
public Const_V_Readonly()
{
I_RO_VALUE = 3;
}
}
AssemblyB references AssemblyA and uses these values in code. When this is compiled,
in the case of the ...
C/C++ line number
...processing, they are replaced respectively by a constant string holding an integer representing the current line number and by the current file name.
Others preprocessor variables :
__func__ : function name (this is part of C99, not all C++ compilers support it)
__DATE__ : a string of form "Mmm d...