Introduction The C#6 “Using static” feature is a great way to simplify your code and make it easier to read. It allows you to access static members of a type without having to specify the type name. This can be especially useful when dealing with large namespaces or when you want to avoid typing out … Read more
That is just some text that passed to another activity….it’s just an example In the tutorial they want to show that how to send an extra message to another activity. You can do it by put an extra message with intent.putExtra(EXTRA_MESSAGE, message); and then in another activity, you can catch it with String message = … Read more
static int n = 0; is one time initialization Like the snippet below, bool initialized = false; static int n; int fun1(int x){ if(!initialized){ n = 0; initialized = true; } if(x > 0){ n++; return fun1(x-1)+n; } return 0; } static int n; n =0 is reset to zero on every recursive call. Like … Read more
Assuming C/C++, I found this here: (1) The use of static inside a function … means that once the variable has been initialized, it remains in memory until the end of the program. You can think of it as saying that the variable sticks around, maintaining its value, until the program completely ends. For instance, … Read more
Introduction Static variables are variables that are declared with the static keyword. They are used to store data that is shared across all instances of a class or program. Static variables are typically used to store data that is not changed often, such as constants or configuration settings. They are also used to store data … Read more
What you have there is a static method getLibrary() that returns the same instance for all callers. That’s called a Singleton – although there’s better ways to code them. Then again your supposed Singleton (TestLibrary) exhibits methods that when called change internal state – most important, the ErrorHandler. This will cause strange behaviour, especially in … Read more
The following declaration within a definition of your class is not enough: private: static map_type * map; In one .cpp file, you must also add: map_type* BaseFactory::map = NULL; This article might help you too: Static data members (C++ only) + this question, which has almost 100k views by now: Initializing private static members 2 … Read more
Please try below code. It might work for you. Use predicate to find element from List. public static class A { public static readonly List<string> alist = new List<string> { //some big data about 70 rows }; public struct astruct { public const string adata = “a data”; } } public class B { string … Read more
Static values can be accessed without creating a class instance and are only created once per class, no matter how many instances you create. solved What static means in swift
This code reminds me of Singleton Class in java. public class Runa { private static Runa singleton = new Runa( ); /* A private Constructor prevents any other * class from instantiating. */ private Runa() { } /* Static ‘instance’ method */ public static Runa getInstance( ) { return singleton; } /* Other methods protected … Read more
Short answer: Final: you cannot change the var after the declaration. Static: the variable is associated with a class not with instances private static int i=10; // belongs to the class private static final int j=10; // belongs to the class and it’s unchangeable private final int k = 10; // it’s unchangeable Long Answer: … Read more
There’s 3 ways that I can think of that would work for you: Create a non-generic base class holding the shared field(s) Create a non-generic separate class holding the shared field(s) Create a non-generic type that holds these shared values, and reuse this inside your generic ones For the third one, since you say you … Read more
Introduction When writing code in JavaScript, it is important to understand why certain statements do not signal an error. One such statement is “return x.a;”. This statement does not signal an error because it is a valid syntax in JavaScript. In this article, we will discuss why this statement does not signal an error and … Read more
but I don’t understand why “return x.a;” doesn’t signal an error return x.a is valid because x is accessible as a local variable inside the static method and is an instance of A. a is an instance property on the instance of A so x.a is perfectly valid. solved Why doesn’t “return x.a;” signal an … Read more
Foo has a static variable called Instance. This static variable is intialized before Main is executed, which causes the constructor Foo() to be called 1 solved why the program doesn’t begin with main method