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。 Java有两种分支结构： if语句 switch语句 if语句 一个if语句包含一个布尔表达式和一条或多条语句。

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 ...

New features in Java Java 17 adoption is increasing as organizations move away from Java 8 and Java 11 to migrate onto the latest LTS release. Plenty has changed since Java 8 and Java 11 were first ...