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Why does int num = Integer.getInteger(“123”) throw NullPointerException?
...t do what you think it does
It returns null in this case
the assignment from Integer to int causes auto-unboxing
Since the Integer is null, NullPointerException is thrown
To parse (String) "123" to (int) 123, you can use e.g. int Integer.parseInt(String).
References
Java Language Guide/Au...
Launch an app on OS X with command line
I want to launch an app on OSX from a script. I need pass it command line arguments. Unfortunately, open doesn't accept command line args.
...
Length of generator output [duplicate]
...
len(list(gen)),
len([_ for _ in gen]),
sum(1 for _ in gen),
ilen(gen) (from more_itertool),
reduce(lambda c, i: c + 1, gen, 0),
sorted by performance of execution (including memory consumption), will make you surprised:
```
1: test_list.py:8: 0.492 KiB
gen = (i for i in data*1000); t0 = m...
How can I make a jQuery UI 'draggable()' div draggable for touchscreen?
...
Heh, now the plugin is missing from manifestinteractive.com, too. Try this: plugins.jquery.com/files/jquery.touch.js.txt
– Ian Hunter
Sep 14 '11 at 17:56
...
How to check that a string is a palindrome using regular expressions?
...chine is composed of nodes and edges. Each edge is annotated with a letter from a finite alphabet. One or more nodes are special "accepting" nodes and one node is the "start" node. As each letter is read from a given word we traverse the given edge in the machine. If we end up in an accepting state ...
Calculate size of Object in Java [duplicate]
...eat example, which I'll repost here, but you should have already looked at from his comment:
import java.lang.instrument.Instrumentation;
public class ObjectSizeFetcher {
private static Instrumentation instrumentation;
public static void premain(String args, Instrumentation inst) {
...
How can I tell when HttpClient has timed out?
...ient()
{
BaseAddress = new Uri(baseAddress),
Timeout = TimeSpan.FromMilliseconds(1)
};
try
{
var s = await client.GetAsync();
}
catch(Exception e)
{
Console.WriteLine(e.Message);
Console.WriteLine(e.InnerException.Message);
}
...
How to use Session attributes in Spring-mvc
...().setAttribute("cart",value);
return "testJsp";
}
and you can get it from controller like this :
ShoppingCart cart = (ShoppingCart)session.getAttribute("cart");
Make your controller session scoped
@Controller
@Scope("session")
Scope the Objects ,for example you have user object that should...
When is the finalize() method called in Java?
...() throws Throwable {}
every class inherits the finalize() method from
java.lang.Object
the method is called by the garbage collector when it determines
no more references to the object
exist
the Object finalize method performs no actions but it may be overridden by
any class
...
Understanding events and event handlers in C#
...to replace myFactory.GetInstance() into myOfflineFakeFactory.GetInstance() from one central place (aka factory method pattern).
Factory method pattern
So, if you have a TheOtherClass class and it needs to use the myFactory.GetInstance(), this is how the code will look like without delegates (you'll ...