scala：如何迭代类型安全配置列表

Question

I am trying to iterate over the config List and it's giving me some error. Not sure what I am doing wrong.

config

test{
  header = [
    {
      name="col0"
      vale="aaa"
    }
    {
    name="col1"
    value="bbb"
    }
  ]
}

code

val headers:ConfigList  = ConfigFactory.load().getList("test.header")

    headers.forEach{header:Config =>
      val name = header.getString("name")
      println(name)
    }

Error

Error:(32, 35) type mismatch;
 found   : com.typesafe.config.Config => Unit
 required: java.util.function.Consumer[_ >: com.typesafe.config.ConfigValue]
    headers.forEach{header:Config =>

Answer 1

As @Luis said, Functions in Scala 2.11.x do are not compiled to Java Functions. And since they are not Java Functions, they can not be converted to Consumer via SAM.

And so, You will need to explicitly provide a Cosumer .

Also, with getList("...") you get a ConfigList which can be used to iterate over ConfigValue elements and not Config .

headers.forEach(new Consumer<ConfigValue> {
  override def accept(configValue: ConfigValue): Unit = {
    // Since you have ConfigValue... do whatever you want with it
    println(configValue.render())
  }
})

What you actually want to use is getConfigList(...)

val headers = ConfigFactory.load().getConfigList("test.header")

headers.forEach(new Consumer<Config> {
  override def accept(config: Config): Unit = {
    println(config.getString("name"))
  }
})