Import statement:error:not found in Scala REPL - scala

Question

I am new to scala. I have created a scala object containing a couple of methods. I am trying to invoke the method from Scala REPL but the import statement is not working.
This is the code I tried (It is in a default package):
object Hello extends App {
def sum(xs: List[Int]): Int = 0;
def max(xs: List[Int]): Int = 0;
}
For starting the Scala REPL, I opened the console and then did the following:
Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation. All rights reserved.
C:\Users\user>sbt
[info] Set current project to user (in build file:/C:/Users/user/)
> console
[info] Updating {file:/C:/Users/user/}user...
[info] Resolving org.fusesource.jansi#jansi;1.4 ...
[info] Done updating.
[info] Starting scala interpreter...
[info]
Welcome to Scala version 2.10.4 (Java HotSpot(TM) 64-Bit Server VM, Java 1.6.0_2
2).
Type in expressions to have them evaluated.
Type :help for more information.
scala> import Hello._
<console>:7: error: not found: value Hello
import Hello._
^
scala>
The project workspace and the project is created in E:/Work. Even I tried navigating to the project and then followed the same steps above but it gives the same error.
Please let me know how to make this import statement work from Scala REPL.

Answer 1

For project structure please refer to this page
Your dir tree should be something like
E:
|
`- Work
|
`- {PROJECT}
|
+- build.sbt
|
`- src
|
`- main
|
`- scala
|
`- Hello.scala
Next navigate to E:\Work\{Project} and from there run sbt and only then console and do all the work
Remember that your REPL will refer to classes that were compiled before console were executed.
Note that your project structure could be much simpler like
E:
|
`- Work
|
`- {PROJECT}
|
`- Hello.scala
But this is not recommended

Answer 2

you need to compile your project
exit the scala REPL, then from the shell prompt:
> sbt clean compile package
the compile task is a dependency on the sbt, so just sbt is the same as sbt compile, but i don't see a line in your console output that shows it compiled your project (it will begin with Compiling)
alternatively if you have no dependencies (which it looks like you don't) then you can just paste that code directly in the REPL session, and let the Scala REPL compile your code for you, like so:
scala> :paste
// paste your code in the REPL window
scala> ctrl-D