switch(expression){casevalue1:// 代码块break;casevalue2:// 代码块break;default:// 默认代码块} 特性限制:必须显式使用break防止贯穿 (fall-through)case值需为编译时常量，且不可重复 无法处理字符串或复杂对象 Java 5 新增支持: 允许case标签使用枚举常量 意义: 增强类型安全性, 避免
As a consequence of the distinction betweenswitchstatements andswitchexpressions,it is possible toreturnfrom inside aswitchstatement, but we’re not allowed to do so from within aswitchexpression. The following example is perfectly valid and will compile: switch (month) { case JANUARY, JUNE, JULY...
Use theswitchstatement to select one of many code blocks to be executed. Syntax switch(expression) { casex: // code block break; casey: // code block break; default: //code block } This is how it works: The switch expression is evaluated once. ...
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...
Theswitchstatement selects one of many code blocks to be executed: SyntaxGet your own Java Server switch(expression){casex:// code blockbreak;casey:// code blockbreak;default:// code block} This is how it works: Theswitchexpression is evaluated once. ...
內容:將switch 陳述式轉換為 C# 8.0 switch 運算式。時機:您想要將 switch 陳述式轉換成 switch 運算式,反之亦然。原因:如果您只使用運算式,這個重構功能可讓您輕鬆地從傳統 switch 陳述式轉換。操作方式請在您的專案檔案中,將語言版本設定為之前版本,因為 switch 運算式現在是新的 C# 8.0 功能。 將游...
Wrapping Up: Mastering Java Switch Statement Decoding the Basic Syntax of Java Switch Statement The switch statement in Java is a multiway branch statement. It provides an easy way to dispatch execution to different parts of your code based on the value of an expression. Here’s the basic syn...
The JavaScript Switch StatementUse the switch statement to select one of many blocks of code to be executed.Syntaxswitch(expression) { case n: code block break; case n: code block break; default: default code block } This is how it works:The switch expression is evaluated once. The value...
switch ( expression ) case constant-expression : statement [default : statement] Remarks Theexpressionmust be of an integral type or of a class type for which there is an unambiguous conversion to integral type. Integral promotion is performed as described inIntegral Promotions. ...
Switch Expression Example publicclassSwitchStatement{publicstaticvoidmain(String[]args){System.out.println("Monday is : "+isWeekDay(Day.TUE));System.out.println("Monday is : "+isWeekDay(Day.SUN));}publicstaticBooleanisWeekDay(Dayday){Booleanresult=switch(day){caseMON,TUE,WED,THUR,FRI->true...