公共（默认）范围

Created: November-22, 2018

默认情况下，范围是 public，可以从任何地方访问该值。

package com.example {
  class FooClass {
    val x = "foo"
  }
}

package an.other.package {
  class BarClass {
    val foo = new com.example.FooClass
    foo.x // <- Accessing a public value from another package
  }
}