当我发现看起来像个臭虫的时候,我正在玩
Scala的结构类型.这是我的代码:
type toD = { def todouble: Double } def foo(t: toD) = t.todouble foo(5)
我收到了这个错误:
java.lang.NoSuchMethodException at scala.runtime.BoxesRunTime.todouble(UnkNown Source) at .foo(<console>:9) at .<init>(<console>:11) at .<clinit>(<console>) at .<init>(<console>:11) at .<clinit>(<console>) at $print(<console>) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(UnkNown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(UnkNown Source) at java.lang.reflect.Method.invoke(UnkNown Source) at scala.tools.nsc.interpreter.IMain$ReadEvalPrint.call(IMain.scala:704) at scala.tools.nsc.interpreter.IMain$Request$$anonfun$14.apply(IMain.scala:920) at scala.tools.nsc.interpreter.Line$$anonfun$1.apply$mcV$sp(Line.scala:43) at scala.tools.nsc.io.package$$anon$2.run(package.scala:25) at java.lang.Thread.run(UnkNown Source)
首先,我不知道为什么这不起作用.其次,奇怪的是代码编译得很好并在运行时抛出一个异常,说该方法实际上并不存在.
有没有人对此有解释?