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How do servlets work? Instantiation, sessions, shared variables and multithreading
...ets and filters are shared among all requests. That's the nice thing about Java, it's multithreaded and different threads (read: HTTP requests) can make use of the same instance. It would otherwise be too expensive to recreate, init() and destroy() them for every single request.
You should also rea...
Is there a method that works like start fragment for result?
...aredViewModel = ViewModelProviders.of(activity).get(SharedViewModel::class.java)
}
}
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?): View? {
return inflater.inflate(R.layout.fragment_first...
java: Class.isInstance vs Class.isAssignableFrom
...
I disagree. If you look up the Javadoc of Byte you will discover it extends Number and is a class. (byte) 1 is not equivalent to Byte. The former is a primitive. The latter is a Class.
– Gili
Feb 28 '14 at 22:11
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Do you (really) write exception safe code? [closed]
...you really write exception safe code?
Of course, I do.
This is the reason Java lost a lot of its appeal to me as a C++ programmer (lack of RAII semantics), but I am digressing: This is a C++ question.
It is, in fact, necessary when you need to work with STL or Boost code. For example, C++ threads (...
Is it unnecessary to put super() in constructor?
...tends Base { }
This is fine because if you add no constructor explicitly Java puts in a public default constructor for you.
public class Base { }
public class Derived extends Base { public Derived(int i) { } }
Also fine.
public class Base { public Base(String s) { } }
public class Derived exte...
Is there a foreach in MATLAB? If so, how does it behave if the underlying data changes?
...1;
f = f*n;
end
disp(['n! = ' num2str(f)])
Btw, the for-each loop in Java (and possibly other languages) produces unspecified behavior when the data structure is modified during iteration. If you need to modify the data structure, you should use an appropriate Iterator instance which allows th...
Spring RestTemplate timeout
... The above code doesn't work in latest Spring. It gives ClassCastException java.lang.ClassCastException: org.springframework.http.client.InterceptingClientHttpRequestFactory cannot be cast to org.springframework.http.client.HttpComponentsClientHttpRequestFactory
– comiventor
...
Difference between “@id/” and “@+id/” in Android
...us symbol + instructs to create a new resource name and add in to the R.java file but what about @id/ ? From the documentation of ID : when referencing an Android resource ID , you do not need the plus symbol, but must add the android package namespace, like so:
...
How comment a JSP expression?
...'t appeal to you:
<% /*= map.size()*/ %>
Code Conventions for the JavaServer Pages Technology Version 1.x Language has details about the different commenting options available to you (but has a complete lack of link targets, so I can't link you directly to the relevant section - boo!)
...
What does cmd /C mean? [closed]
I can understand cmd but not cmd /c . I was trying to invoke a java program from the current for which I use Runtime.getRuntime().exec("cmd /C java helloworld"); There arises my doubt.
...