Java 12 doesn’t bring any new language feature that you can readily use. However, it brings switch expressions, which are available as a preview language feature. Switch expressions are a helpful addition that will enable you to write code that is a bit more concise and less error-prone. ...
Java 14(JEP 361) adds a new form of switch label “case L ->” whichallows multiple constants per case. Newswitch expressions can yield a valuefor the whole switch-case block that can then be assigned to a variable in same statement. 1. Switch Expressions In Java 14,switchexpressions are...
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...
public enum Day { SUNDAY, MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY; } int numLetters = 0; Day day = Day.WEDNESDAY; switch (day) { case MONDAY: case FRIDAY: case SUNDAY: numLetters = 6; break; case TUESDAY: numLetters = 7; break; ...
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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,JEP 325: Switch Expressionsenhanced the traditionalswitchstatement to support the following new features: Multiple case labels Switch expression returning value via break (replaced withyieldinJava 13 switch expressions) Switch expression returning value via label rules (arrow) ...
Java Copy In this example, we have a switch statement that checks the value of the variableday. Depending on the value, it executes a different code block. Ifdayis 1, it prints ‘Monday’. Ifdayis 2, it prints ‘Tuesday’. In our case,dayis 3, so none of the cases match and not...
在学习分支语句的时候,我们都学过switch语句,相比于if-else语句,他看起来更加整洁,逻辑更加清晰,Java中当然也给我们提了相关的switch方法。但是Java的强大之处在于,他对这一语句结构进行了拓展。在Java 12中,Java新引入了switch表达式Switch Expressions,我们都知道,switch 语句如果漏写一个 break,那么逻辑往往就跑偏了...
This is a modal window. No compatible source was found for this media. Output Compile and run the above program using various command line arguments. This will produce the following result − NO OUTPUT Note:Since the given month's value is 13 and we did not use the "default" statement ...