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How do I get the file extension of a file in Java?
...
Do you really need a "parser" for this?
String extension = "";
int i = fileName.lastIndexOf('.');
if (i > 0) {
extension = fileName.substring(i+1);
}
Assuming that you're dealing with simple Windows-like file names, not something like archive.tar.gz.
Btw, for the case that a di...
Windows下 C++网络延时检测 - C/C++ - 清泛网 - 专注C/C++及内核技术
...f ICMPECHO* PICMPECHO;
class CPing
{
public:
CPing();
~CPing();
int Ping(char* strHost);
private:
// ICMP.DLL Export Function Pointers
HANDLE (WINAPI *pIcmpCreateFile)(VOID);
BOOL (WINAPI *pIcmpCloseHandle)(HANDLE);
DWORD (WINAPI *pIcmpSendEcho) (HANDLE, DWORD, LPVOID, WORD, PIPI...
How can a Java program get its own process ID?
...orm is pretty simple:
Windows
Make sure you have jna-platform.jar then:
int pid = Kernel32.INSTANCE.GetCurrentProcessId();
Unix
Declare:
private interface CLibrary extends Library {
CLibrary INSTANCE = (CLibrary) Native.loadLibrary("c", CLibrary.class);
int getpid ();
}
Then:
in...
How do you set, clear, and toggle a single bit?
...er >> n) & 1U;
That will put the value of the nth bit of number into the variable bit.
Changing the nth bit to x
Setting the nth bit to either 1 or 0 can be achieved with the following on a 2's complement C++ implementation:
number ^= (-x ^ number) & (1UL << n);
Bit n will be s...
#ifdef #ifndef in Java
...in(String[] args)
{
if (debug)
{
System.out.println("debug was enabled");
}
else
{
System.out.println("debug was not enabled");
}
}
}
javap -c Test gives the following output, indicating that only one of the two paths was compi...
How to add extension methods to Enums
...lic class Enum<T> where T : struct, IConvertible
{
public static int Count
{
get
{
if (!typeof(T).IsEnum)
throw new ArgumentException("T must be an enumerated type");
return Enum.GetNames(typeof(T)).Length;
}
}
}
Yo...
What are the most common naming conventions in C?
...n structs: classic C style: gtk_widget_show(), tracking_order_process().
Pointers: nothing fancy here:
GtkWidget *foo, TrackingOrder *bar.
Global variables: just don't use global variables. They are evil.
Functions that are there, but
shouldn't be called directly, or have
obscure uses, or whatever: ...
What does auto&& tell us?
... std::vector, take an iterator to its first element and modify the value pointed to by that iterator in some way:
auto&& vec = some_expression_that_may_be_rvalue_or_lvalue;
auto i = std::begin(vec);
(*i)++;
This code will compile just fine regardless of the initializer expression. The alt...
How can I use pointers in Java?
I know Java doesn't have pointers, but I heard that Java programs can be created with pointers and that this can be done by the few who are experts in java. Is it true?
...
How can I check if my python object is a number? [duplicate]
... @AlexKahn In Python, booleans are practically numbers: bool inherits from int, abs(True) == 1, "foo" * False == "", sum([True, False, True]) == 2, "%f" % True == "1.0", and so on.
– user395760
Nov 24 '15 at 22:12
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