Packages and package objects

Just like Java, a is a special container or which contains/defines a set of objects, classes, and even packages. Every Scala file has the following automatically imported:

• java.lang._
• scala._
• scala.Predef._

The following is an example for basic imports:

// import only one member of a package
import java.io.File
// Import all members in a specific package
import java.io._
// Import many members in a single import statement
import java.io.{File, IOException, FileNotFoundException}
// Import many members in a multiple import statement
import java.io.File
import java.io.FileNotFoundException
import java.io.IOException

You can even rename a member while importing, and that's to avoid a collision between packages that have the same member name. This method is also called class alias:

import java.util.{List => UtilList}
import java.awt.{List => AwtList}
// In the code, you can use the alias that you have created
val list = new UtilList

As mentioned in Chapter 1, Introduction...