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...
switch(expression){casevalue1:// 代码块break;casevalue2:// 代码块break;default:// 默认代码块} ...
可以通过switch表达式来进行简化。将冒号(:)替换为箭头(->),并且switch表达式默认不会失败,所以不需要break。 private static void withSwitchExpression(Fruit fruit) { switch (fruit) { case APPLE, PEAR -> System.out.println("普通水果"); case MANGO, AVOCADO -> System.out.println("进口水果"); defaul...
这可以通过使用 Switch 表达式来解决。用箭头 (->) 替换冒号 (:) 并确保在大小写中使用表达式。Switch 表达式的默认行为是没有失败，因此不需要 break。private static void withSwitchExpression(FruitType fruit) { System.out.println(""" *** * With switch expression * ***"""); switch...
The processing logic of eachcaseis implemented with theLambdasyntax, which can eliminate thebreakstatement (this is anew feature of JDK 14: switch expression enhancementintroduced function ) In addition, it should be noted that for the function of pattern matching in switch expressions, the implement...
When using a switch expression in Java 14, you don’t have to use thebreakkeyword to break out of the switch statement or usereturnkeyword on each switch case to return a value; instead, you can return the entire switch expression. This enhanced switch expression makes the overall code look...
Since the code block for if-else in the original code snippet defined multiple lines of code, it made sense to convert it to a switch statement rather than a switch expression. This brings us to another interesting question – what is the relation between switch statement, switch expression, ...
Skip navigation links Java SE 17 & JDK 17 Overview Module Package Class Use Tree Preview New Deprecated Index Help Summary: Nested | Field | Constr | Method Detail: Field | Constr | Method SEARCH: Module jdk.compiler Package com.sun.source.tree Interface SwitchExpressionTree All Superinterfaces...
switch(expression){casevalue1:// 执行语句块1// 执行语句块2casevalue2:// 执行语句块3break;...} 1. 2. 3. 4. 5. 6. 7. 8. 9. 在这种方法中,我们省略了case语句块中的break语句。这样,当程序执行到某个case时,会一直往下执行直到break或者switch语句结束。
Enhances the Java programming language allowing pattern matching to be tested within a switch statement or switch expression. Using pattern matching in switch complex data-oriented queries can be expressed concisely and safely. JEP 406 was developed in theOpenJDK Project Amber. ...