Scala甚至使得把null作为第二个参数传给构造函数变得很困难；它不会再编译时做类型检查。

Scala even makes it difficult to pass null as the second parameter to the constructor; it won't type check when you compile it.

youdao

Scala甚至使得把null作为第二个参数传给构造函数变得很困难；它不会再编译时做类型检查。

Scala even makes it difficult to pass null as the second parameter to the constructor; it won't type check when you compile it.

youdao