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Java HashMap performance optimization / alternative
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As many people pointed out the hashCode() method was to blame. It was only generating around 20,000 codes for 26 million distinct objects. That is an average of 1,300 objects per hash bucket = very very bad. However if I turn the two arrays i...
Getting the name of the currently executing method
...quired to be able to provide a stacktrace, but that a lot of work has gone into making HotSpot very reliable. You need to know, though, in case you want your code to not rely on the behavior of a specific JVM.
– Thorbjørn Ravn Andersen
Apr 15 '13 at 8:53
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What is the difference between IEqualityComparer and IEquatable?
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IEqualityComparer<T> is an interface for an object that performs the comparison on two objects of the type T.
IEquatable<T> is for an object of type T so that it can compare itself to another of the same type.
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How do I make an http request using cookies on Android?
...);
HttpEntity entity = response.getEntity();
System.out.println("Login form get: " + response.getStatusLine());
if (entity != null) {
entity.consumeContent();
}
System.out.println("Initial set of cookies:");
List<Cookie> cookies = ht...
Pointer expressions: *ptr++, *++ptr and ++*ptr
... helpful. Let's begin with your program, as it's the simplest to explain.
int main()
{
const char *p = "Hello";
while(*p++)
printf("%c",*p);
return 0;
}
The first statement:
const char* p = "Hello";
declares p as a pointer to char. When we say "pointer to a char", what does...
'is' versus try cast with null check
...lue type will use unbox.any rather than castclass:
object o = 5;
if (o is int)
{
var x = (int)o;
}
IL_0000: nop
IL_0001: ldc.i4.5
IL_0002: box System.Int32
IL_0007: stloc.0 // o
IL_0008: ldloc.0 // o
IL_0009: isinst System.Int32
IL_000E: ldnull
IL...
How to center align the ActionBar title in Android?
...Manifest.xml, and also does som other custom stuff (like setting a custom tint on action bar buttons, and custom font on the title). You only need to leave out the gravity in action_bar.xml, and use padding instead. actionBar != null check is used, since not all my activities have one.
Tested on 4....
Why does the C++ map type argument require an empty constructor when using []?
.../find functions.
Following example works fine:
myMap.insert( std::map< int, MyClass >::value_type ( 1, MyClass(1) ) );
myMap.find( 1 )->second;
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Java: Get last element after split
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Very nice, and of course first() and nth(T[array], int n) is nicely made from this.
– Peter Ajtai
Apr 13 '12 at 22:11
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SSH library for Java [closed]
...but this is:
https://github.com/hierynomus/sshj
hierynomus took over as maintainer since early 2015. Here is the older, no longer maintained, Github link:
https://github.com/shikhar/sshj
There was a GSOC project:
http://code.google.com/p/commons-net-ssh/
Code quality seem to be better than ...