Question

我写了这个scala代码

package com.abhi

import java.io.File

object Main1 {
    def main(args: Array[String]) : Unit = {
        println("Main1 Hello World")
    }
}

object Main2 {
    def main(args: Array[String]) : Unit = {
        println("Main2 Hello World")
    }
}

和这个built.sbt文件

name := "Foo"

version := "1.0"

scalaVersion := "2.11.6"

libraryDependencies ++= Seq(
    "org.scalatest" % "scalatest_2.11" % "2.2.4" % "test"   
)

mainClass:= Some("com.abhi.Main1")

但是当我运行sbt run时，它仍然会说

[warn] Multiple main classes detected.  Run 'show discoveredMainClasses' to see the list

Multiple main classes detected, select one to run:

 [1] com.abhi.Main1
 [2] com.abhi.Main2

Enter number:

为什么还要问我选择哪个班级？要选择的主要类已在build.sb

中指定

Answer 1

查看How to set main class in build?

的答案

你需要这样的东西：

mainClass in (Compile, run) := Some("com.abhi.Main1")

SBT不会选择指定的mainClass

1 个答案: