大约有 47,000 项符合查询结果（耗时：0.0682秒） [XML]
Covariance, Invariance and Contravariance explained in plain English?
...ovariant, contravariant, or invariant? Covariant would mean that a List<String> is a subtype of List<Object>, contravariant that a List<Object> is a subtype of List<String> and invariant that neither is a subtype of the other, i.e. List<String> and List<Object> ar...
Why create “Implicitly Unwrapped Optionals”, since that implies you know there's a value?
...buddies that never go anywhere without each other
class B {
var name : String
weak var myBuddyA : A!
init(name : String) {
self.name = name
}
}
class A {
var name : String
var myBuddyB : B
init(name : String) {
self.name = name
myBuddyB = B(name:"...
How to display Toast in Android?
...splay Toast in your application, try this:
Toast.makeText(getActivity(), (String)data.result,
Toast.LENGTH_LONG).show();
Another example:
Toast.makeText(getActivity(), "This is my Toast message!",
Toast.LENGTH_LONG).show();
We can define two constants for duration:
int LENGTH_LONG...
Semicolons superfluous at the end of a line in shell scripts?
...e superfluous, since the newline is also a command separator. case specifically needs double semicolons at the end of the last command in each pattern block; see help case for details.
share
|
impro...
jQuery: Get selected element tag name
...
Note that the string that's returned is in CAPITAL LETTERS. This'll be a gotcha if you're trying to compare it to "div" or "a" for example.
– Hartley Brody
Apr 29 '14 at 23:41
...
\r\n, \r and \n what is the difference between them? [duplicate]
I need to ask about the difference in a string between \r\n , \r and \n . How is a string affected by each?
4 Answers
...
Launch custom android application from android browser
...link to http://twitter.com/status/1234:
Uri data = getIntent().getData();
String scheme = data.getScheme(); // "http"
String host = data.getHost(); // "twitter.com"
List<String> params = data.getPathSegments();
String first = params.get(0); // "status"
String second = params.get(1); // "1234"...
What is SuppressWarnings (“unchecked”) in Java?
... onto the class itself or onto a long method). An example:
public List<String> getALegacyListReversed() {
@SuppressWarnings("unchecked") List<String> list =
(List<String>)legacyLibrary.getStringList();
Collections.reverse(list);
return list;
}
...
Spring MVC type conversion : PropertyEditor or Converter?
...ed.
In my mind, PropertyEditors are limited in scope - they help convert String to a type, and this string typically comes from UI, and so registering a PropertyEditor using @InitBinder and using WebDataBinder makes sense.
Converter on the other hand is more generic, it is intended for ANY conve...
C/C++ include header file order
... method can introduce hidden dependencies, say if myclass.cpp includes <string> then <myclass.h>, there's no way to catch at build time that myclass.h may itself depend on string; so if later on you, or someone else, includes myclass.h but don't need string, you'll get an error that need...