Q:

Difference between importing a class or creating an instance of it

I have a subclass (Item) in a java class named (tools) that I would like to use in a few different classes in my app now what I would like to know is what is the difference between using 
import com.example.tools;

and creating an instance of the class :
Tools item = new Tools();

do they both get the same results and is one slower than the other or is there a reason why I would use one instead of the other . thanks for your answers.

A:

import just gives you a shortcut to the name of the class. You could (although it's not recommended) not import the class and simply refer to it as com.example.Tools everywhere. new Tools() actually creates an instance of the class, that you can call methods on, etc.

A:

Well, your question seems to be a typical Java (or maybe more: object-oriented programming) question. Please, feel free to read this really good article Java - Object & Classes.
I also recommend you read at least parts of this classic programming book:
Thinking in Java
Like @blm said, import is just a shortcut to existing object, where new means that you' ve created a new instance of it and 'new Human()' called 'paul' can do what every 'Human()' does.
Remember, that in Android you can't create instance of some main classes like Activity. Too learn more about it visit:
Create instance of new class in Android
Creating an instance using the class name and calling constructor

