What is the role of static keyword in importing java.lang.System class?
import, java, java.lang.class, package
Solution
A `static` import allows you to write this:
out.print("The result is ");
rather than this:
System.out.print("The result is ");
See e.g. http://docs.oracle.com/javase/1.5.0/docs/guide/language/static-import.html.
Problem
I don't understand the meaning of the keyword `static` when I import `System` class: ``` import static java.lang.System.* ``` I'm reading the book about Java and it's written there: Any import declaration that doesn't use the word `static` must start with the name of a package and must end with either of the following: - The name of a class within that package - An asterisk (indicating all classes within that package) For example, the declaration import `java.util.Scanner;` is valid because `java.util` is the name of a package in the Java API, and `Scanner` is the name of a class in the `java.util` package. Here’s another example. The declaration `import javax.swing.*;` is valid because `javax.swing` is the name of a package in the Java API, and the asterisk refers to all classes in the `javax.swing` package. And I have the following code: ``` public class Addition { public static void main(String[] args) { double num; num = 100.53; num = num + 1000; // So when I want to import the whole package java.lang as written in the book, it doesn't work: // import java.lang.*; // or like this: // import static java.lang.*; // NetBeans in both cases doesn't see these abbreviated names `out` and throws errors. Why? out.print("The result is "); out.print(num); out.println(" ."); } } ``` And it works when I import this way: ``` import static java.lang.System.out; import static java.lang.System.* ``` But doesn't work when I try do this: ``` import java.lang.System.out; import java.lang.System.* ``` What's the meaning of the `static` keyword in this particular case? And why `import java.lang.*;` doesn't import the whole package with `System` class in it?