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Immutability of Strings in Java
... this code, for example:
String s1 = "Hello";
String s2 = s1;
// s1 and s2 now point at the same string - "Hello"
Now, there is nothing1 we could do to s1 that would affect the value of s2. They refer to the same object - the string "Hello" - but that object is immutable and thus cannot be altered....
Python assigning multiple variables to same value? list behavior
...t element of a to 1, the first elements of b and c are 1.
If you want to know if two names are naming the same object, use the is operator:
>>> a=b=c=[0,3,5]
>>> a is b
True
You then ask:
what is different from this?
d=e=f=3
e=4
print('f:',f)
print('e:',e)
Here, you'r...
String vs. StringBuilder
... the enormous performance difference in my applications between the two, I now think about it a little more carefully.
Luckily, it's relatively straightforward to run performance analysis on your code to see where you're spending the time, and then to modify it to use StringBuilder where needed.
...
MySQL: Transactions vs Locking Tables
...posit all the service fees charged on the transaction. Given (as everyone knows these days) that banks are extraordinarily stupid, let's say their system works like this:
$balance = "GET BALANCE FROM your ACCOUNT";
if ($balance < $amount_being_paid) {
charge_huge_overdraft_fees();
}
$balance...
How can one use multi threading in PHP applications
...
That's nice, I have not touched PHP for years and now it's got multithreading capabilities!
– cruizer
Mar 27 '14 at 8:33
1
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How do I install ASP.NET MVC 5 in Visual Studio 2012?
...udio 2012 Express for Web.
You can download and start using these features now.
The download link is to a Web Platform Installer that will allow you to start a new MVC5 project from VS2012.
share
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...
How to launch Safari and open URL from iOS app
...erstood this but if I am opening a website and user is surfing the website now if he stops by a particular page then can I get the current webpage link in my code?
– Varun Jain
Jun 1 '16 at 7:33
...
Open multiple Eclipse workspaces on the Mac
...
But now I can't close the terminal window until I close eclipse
– Blundell
Jul 5 '12 at 7:37
1
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ADB Android Device Unauthorized
...k if you are agree to connect the computer id.
You need to confirm it.
5. Now Check the device
It is now authorized!
adb devices
<ANDROID_SDK_HOME>\platform-tools>adb devices
List of devices attached
4df798d76f98cf6d device
...
What is the difference between include and extend in Ruby?
...class (i.e. the singleton class)
e.g.
if you call Klazz.extend(Mod), now Klazz has Mod's methods (as class methods)
if you call obj.extend(Mod), now obj has Mod's methods (as instance methods), but no other instance of of obj.class has those methods added.
extend is a public method
include -...