问题描述
如何将包导入 Scala 的 REPL?我正在尝试导入这个名为 funsets 的包，它有一个名为FunSets"的对象.我尝试了 import funsets._ 和 import funsets._; 等的几种变体，但它仍然没有导入包中的函数和对象.
How do I import a package into Scala's REPL?I am trying to import this package called funsets which has an object named "FunSets".I tried several variations of import funsets._ and import funsets._; etc but it is still not importing the functions and object in the package.
推荐答案
一种方法是编译scala 类"并将它们放入 classpath.
例子，
1) 假设您有一个类 funsets.FunSets.scala
package funsets
object FunSets {
def fun = "very fun"
}
2) 首先使用 scalac 编译类.(如果你使用 sbt 那么 sbt compile 将把target/ 文件夹中的编译类)
2) Compile the class first using scalac. (If you use sbt then sbt compile would put compiled classes in target/ folder)
scalac FunSets.scala
您将看到创建的 funsets 文件夹/包，
You will see the funsets folder/package created,
$ ls -l
total 16
-rw-r--r-- 1 updupd NA\Domain Users 63 Dec 18 11:05 FunSets.scala
drwxr-xr-x 4 updupd NA\Domain Users 136 Dec 18 11:06 funsets
3) 然后用类路径中的 funsets 包启动 REPL
3) Then start REPL with funsets package in classpath
$ scala -classpath .
Welcome to Scala 2.12.3 (Java HotSpot(TM) 64-Bit Server VM, Java 1.8.0_151).
Type in expressions for evaluation. Or try :help.
scala> import funsets._
import funsets._
注意:如果使用sbt compile，请将target/classes放在classpath中.
Note: if you use sbt compile, put target/classes in classpath.
访问 Funsets 单例，
Access Funsets singleton,
scala> FunSets.fun
res0: String = very fun
另请阅读Scala REPL 无法导入包
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