Java import class system

I have a question about class import. If you import a class, you seem to be able to call a method with a reduced line I don't understand the name of this operation. How can it be

For example:

Why this code

public class test 
{
        public static void main  (String args[])
        {
                System.out.print("Test");
        }
}

Can be replaced with

import static java.lang.System.out;

public class test 
{
        public static void main  (String args[])
        {
                out.print("Test");
        }
}

What if you still have an object called "out"?

Thank you in advance

Solution

What happens is that the external class must be referenced by its full name:

String out = "Hello World";
java.lang.System.out.println(out);