Scala翻译找不到我的课？

Question

我正在尝试在解释器中加载Scala文件:

trait MyOrdered {
  def <(that: MyInt):Boolean = compare(that) < 0
  def >(that: MyInt):Boolean = compare(that) > 0
  def <=(that: MyInt):Boolean = compare(that) < 0 || this == that
  def >=(that: MyInt):Boolean = compare(that) > 0 || this == that
  def compare(that: MyInt): Int
}

class MyInt(val value: Int) extends MyOrdered {
  def compare(that: MyInt) =
    if (this.value < that.value) -1 
    else if (this.value == that.value) 0
    else 1
}


object App extends Application{
  val a = new MyInt(2)
  val b = new MyInt(4)
  println(a < b)
  println(a > b)
}

但我收到一个愚蠢的错误:

Loading traits.scala...
<console>:8: error: not found: type MyInt
         def <(that: MyInt):Boolean = compare(that) < 0
                     ^
<console>:12: error: not found: type MyInt
         def compare(that: MyInt): Int

我怎样才能让翻译知道MyInt课程,这是在路上定义的？

Answer 1

我想你想要的行为:paste.:load表现就像你在解释器中输入一样,即,一旦找到结束括号,它就会解释.您可以:paste通过将代码包装在某个对象中来模拟,如下所示:

object Test {
  trait MyOrdered {
def <(that: MyInt):Boolean = compare(that) < 0
def >(that: MyInt):Boolean = compare(that) > 0
def <=(that: MyInt):Boolean = compare(that) < 0 || this == that
def >=(that: MyInt):Boolean = compare(that) > 0 || this == that
def compare(that: MyInt): Int
}

class MyInt(val value: Int) extends MyOrdered {
  def compare(that: MyInt) =
  if (this.value < that.value) -1 
  else if (this.value == that.value) 0
  else 1
}


object App extends Application{
  val a = new MyInt(2)
  val b = new MyInt(4)
  println(a < b)
  println(a > b)
 }
}

现在,你可以把它作为你想后:load Test.scala和 import Test._