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Simple explanation of clojure protocols
...d. We want them to be type-safe. [Note: not all of these make sense in all languages. But, for example, the goal to have them type-safe makes sense even in a language like Clojure. Just because we can't statically check type-safety doesn't mean that we want our code to randomly break, right?]
The E...
Is Ruby pass by reference or by value?
@user object adds errors to the lang_errors variable in the update_lanugages method.
when I perform a save on the @user object I lose the errors that were initially stored in the lang_errors variable.
...
REDHAT 6.4 X64下ORACLE 11GR2静默安装 - 数据库(内核) - 清泛网 - 专注C/C++及内核技术
...Y_PATH=$ORACLE_HOME/lib
PATH=$PATH:$ORACLE_HOME/bin:$HOME/bin
export NLS_LANG=American_American.ZHS16GBK
export ORACLE_BASE ORACLE_HOME ORACLE_SID LD_LIBRARY_PATH PATH
保存退出后执行如下命令使以上设置在当前窗口如果有配置有问题也可以提示。立即生效：
source...
How much faster is C++ than C#?
...
There is no strict reason why a bytecode based language like C# or Java that has a JIT cannot be as fast as C++ code. However C++ code used to be significantly faster for a long time, and also today still is in many cases. This is mainly due to the more advanced JIT optim...
Regular expression for floating point numbers
...[.] instead of \. and [0-9] instead of \d to avoid escaping issues in some languages (like Java).
Thanks to the nameless one for originally recognizing this.
One relatively simple pattern for matching a floating point number is
[+-]?([0-9]*[.])?[0-9]+
This will match:
123
123.456
.456
See ...
Do fragments really need an empty constructor?
... + " empty constructor that is public", e);
} catch (java.lang.InstantiationException e) {
throw new InstantiationException("Unable to instantiate fragment " + fname
+ ": make sure class name exists, is public, and has an"
+ " empty constructo...
Does Java casting introduce overhead? Why?
...
Upcast operations (also called
widening conversions in the Java
Language Specification) convert a
subclass reference to an ancestor
class reference. This casting
operation is normally automatic, since
it's always safe and can be
implemented directly by the compiler.
Downcas...
Why do == comparisons with Integer.valueOf(String) give different results for 127 and 128?
...the argument and the radix 10 were given as arguments to the parseInt(java.lang.String, int) method.
valueOf
Returns an Integer object holding the value extracted from the specified String when parsed with the radix given by the second argument. The first argument is interpreted as representing a s...
JAX-RS — How to return JSON and HTTP status code together?
...ebservice.annotations.status;
import javax.ws.rs.NameBinding;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
@NameBinding
@Retention(RetentionPolicy.RUNTIME)
public @interface Status {
int CREATED = 201;
int value();
}
Here's the meat of the filter:
pack...
FragmentPagerAdapter Exists Only In Android.Support.V4.App (and not Android.App)
...using Android.Util;
using Android.Views;
using Android.Widget;
using Java.Lang;
using Android.Support.V4.View;
using Fragment = Android.App.Fragment;
namespace Support4
{
[Activity (Label = "@string/fragment_pager_support")]
[IntentFilter (new[]{Intent.ActionMain}, Categories = new[]{ "mo...