Learn how to use pattern-matching features in your Java programs, including pattern matching with switch statements, when clauses, sealed classes, and a preview of primitive type pattern matching in ...

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 ...