In fact, this example would compile because you can use curly braces in this way to encapsulate lines of code, but realize for now, that, not good.

实际上，这个例子可以编译,因为你可以用这种方式来压缩代码行,但是请认识到，那个，不太好。

哈佛公开课 - 计算机科学课程节选

The curly braces to encapsulate one or more lines of code.

花括号压缩了一行或多行代码。

哈佛公开课 - 计算机科学课程节选