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Static import is a feature introduced in the Java programming language that allows members (fields and methods) which have been scoped within their container class as public static, to be used in Java code without specifying the class in which the field has been defined.
import static java.lang.System.out; //'out' is a static field in java.lang.System public class HelloWorld {public static void main (String [] args) {/* The following line is equivalent to System.out.println("Hi World!"); and would have been incorrect without the import declaration. */ out. println ("Hello World!");}}
public final class Constants {private Constants {// restrict instantiation} public static final double PI = 3.14159; public static final double PLANCK_CONSTANT = 6.62606896e-34;} Since Java 5 , one can use static import [ 4 ] to be able to use the constants without the Constants qualifier:
In all versions of Java, the idiom enables a safe, highly concurrent lazy initialization of static fields with good performance. [ 1 ] [ 2 ] public class Something { private Something () {} private static class LazyHolder { static final Something INSTANCE = new Something (); } public static Something getInstance () { return LazyHolder .
/*Ruby has three member variable types: class, class instance, and instance. */ class Dog # The class variable is defined within the class body with two at-signs # and describes data about all Dogs *and* their derived Dog breeds (if any) @@sniffs = true end mutt = Dog. new mutt. class. sniffs #=> true class Poodle < Dog # The "class instance variable" is defined within the class body with a ...
// Correct lazy initialization in Java class Foo {private static class HelperHolder {public static final Helper helper = new Helper ();} public static Helper getHelper {return HelperHolder. helper;}} This relies on the fact that nested classes are not loaded until they are referenced.
C# can be considered as similar to Java, in terms of its language features and basic syntax: Java has JVM, C# has .Net Framework; Java has bytecode, C# has MSIL; Java has no pointers (real memory) support, C# is the same. Regarding the final keyword, C# has two related keywords: The equivalent keyword for methods and classes is sealed
Java is a high-level, class-based, object-oriented programming language that is designed to have as few implementation dependencies as possible. It is a general-purpose programming language intended to let programmers write once, run anywhere (), [16] meaning that compiled Java code can run on all platforms that support Java without the need to recompile. [17]