Allowing developers to handle an exception from the selector in switch with a case in the switch block would make switch more usable for pattern matching, the proposal says. The readability, ...

顺序结构只能顺序执行，不能进行判断和选择，因此需要分支结构。 一个if语句包含一个布尔表达式和一条或多条语句。 语法 ...