Scala 公共方法：';'预期但“def”成立
我写了这个方法：
public def getXScaleFactor(panelWidth: Int): Double = {
return (panelWidth / (samplesContainer[0].length.asInstanceOf[Double]))
}
并且我在编译时遇到问题：
[error] ./src/main/scala/Controllers/TrackController.scala:85: ';' expected but 'def' found.
[error] public def getXScaleFactor(panelWidth: Int): Double {
[error] ^
这段代码有什么问题？
I wrote this method:
public def getXScaleFactor(panelWidth: Int): Double = {
return (panelWidth / (samplesContainer[0].length.asInstanceOf[Double]))
}
and I have problems with compilation:
[error] ./src/main/scala/Controllers/TrackController.scala:85: ';' expected but 'def' found.
[error] public def getXScaleFactor(panelWidth: Int): Double {
[error] ^
What is wrong in this code?
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评论（4）
public不是 Scala 中的保留字，因此它将其解释为变量名。默认为公共访问；只要去掉public就可以了。publicis not a reserved word in Scala, so it's interpreting it as a variable name. Public access is the default; just leave offpublicand you'll be fine.方法默认是公共的。删除
public。Methods are public by default. Remove
public.只是为了添加上面的答案：
您还可以删除
return关键字。函数/方法中的最后一个语句/表达式自动成为返回值。Just to add up to the answers above:
You can also remove
returnkeyword. The last statement/expression in a function/method is automatically the return value.问题在于您已经编写了 Java 代码。
除了
public之外，您还使用[]对集合进行索引访问（这是无效的）、显式返回类型（这不是必需的），return（这也是不需要的）和.asInstanceOf（这是不必要的，并且有代码味道）尝试这个以获得轻量级、更惯用的体验：
或者如果 < code>samplesContainer 可能为空：
放入任何内容更喜欢代替默认的
42The problem is that you've written Java code.
As well as
public, you've also used[]for indexed access to a collection (which is invalid), an explicit return type (which isn't needed),return(which also isn't needed), and.asInstanceOf(which is unnecessary, and a code smell)Try this for a lightweight, more idiomatic experience:
Or if
samplesContainermight be empty:Put whatever you prefer in place of the default
42there