int numLetters = 0; Day day = Day.WEDNESDAY; int result = switch (day) { case MONDAY, FRIDAY, SUNDAY -> numLetters = 6; case TUESDAY -> numLetters = 7; case THURSDAY, SATURDAY -> numLetters = 8; case WEDNESDAY -> numLetters = 9; default -> throw...
For example: switch ( expression ) { cases } See Java Language Specification: 15.29 Switch Expressions Since: 12 Nested Class Summary Nested classes/interfaces declared in interface com.sun.source.tree.Tree Tree.Kind Method Summary All MethodsInstance MethodsAbstract Methods Modifier and Type Method ...
Java 12版本:在Java 12版本中,switch case语句引入了新的语法:使用“yield”关键字来返回结果。 Java 14版本:在Java 14版本中,switch case语句引入了新的语法:使用“->”箭头操作符来将标签与代码块分开,并且可以使用模式变量来进行类型检查和类型转换。这个新的语法被称为“Switch Expressions with Enhanced Pattern...
4.Java 8之后的那些新特性(四):网络请求 Java Http Client 5.Java 8之后的那些新特性(五):Helpful NullPointerExceptions 6.Java 8之后的那些新特性(六):记录类 Record Class 从switch语句说起 要注意区分下,switch statement(switch语句)与switch expressions(switch表达式)两个词的不同。switch语句是大家熟悉的...
While our example is a bit arbitrary, the point is that we’ve got access to more of the Java language here. 5.3. Returning InsideswitchExpressions As a consequence of the distinction betweenswitchstatements andswitchexpressions,it is possible toreturnfrom inside aswitchstatement, but we’re not...
Bierman:Completeness appeared withswitchexpressions that were finalized in Java 14. When you are evaluating any expression in Java, you expect it to result in either avalueor anexception. When we introducedswitchexpressions, we had a question in the design process: What if your cases don’t cov...
final Integer = 3; case a3; // 异常 case expressions must be constant expressions final String a4 = "hello"; case a4; // 正确 1. 2. 3. 4. 2.switch在进入某条件分支后(case或default)会一直往下执行代码,直到遇到break。这点上面有例子讲到。
switch expressions 是从Java 12开始引入的特性。如果你的Java版本低于12,那么你将无法使用这一特性。你可以通过运行以下命令来检查你的Java版本: bash java -version 确保你的Maven版本是最新的,或者至少是支持编译Java 12及以上版本的。你可以通过以下命令来检查Maven版本: bash mvn -version 检查项目的pom.xml文...
Java 12 introduced the switch expressions which can compute the value for the whole switch statement and assign its value to a variable. It is very similar to other normal Java statements. 2.1. Return value with Arrow Syntax Let us rewrite the last example, with a switch expression. Noticelin...
GitHub - chengco/java-features-demo: Java 17 new featuresgithub.com/chengco/java-features-demo switch开始支持表达式(从JDK 12) Java 12引入了switch表达式, 使用switch表达式可以用于变量声明或return,使用->和yield来代替break实现退出分支 staticStringswitchSupportExpression(Strings){returnswitch(s){case"...