We can’t compare all the types of objects and primitives in theswitchstatement.Aswitchworks only with four primitives and their wrappers as well as with theenum typeand theStringclass: byteandByte shortandShort intandInteger charandCharacter enum String Stringtype is available in theswitchstatement...
并且简化后的switch代码块中定义的局部变量,其作用域就限制在代码块中,而不是蔓延到整个switch结构,也不用根据不同的判断条件来给变量赋值。 JAVA12之前switch语句 package com.morris.java12; /** * java12之前switch的使用 */ public class SwitchBefore12Demo { public static void main(String[] args) { M...
switch(表达式)中表达式的返回值必须是下述几种类型之一:byte,short,char,int,String, 枚举; case子句中的值必须是常量,且所有case子句中的值应是不同的; default子句是可任选的,当没有匹配的case时,执行default。 break语句用来在执行完一个case分支后使程序跳出switch语句块;如果没有break,程序会顺序执行到后面第...
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...
The ternary operator is a shorthand way of writing an if-else statement. It’s less readable than both if-else and switch statements, but it can be very concise. Here’s an example: intnum=2;Stringresult=(num==1)?'One':(num==2)?'Two':'Not one or two';System.out.println(result...
Proposal: the switch statement should be enhanced thus:The switch expression must be of type char, byte, short, int, or String. All case labels must be constant expressions—the expressions must contain only literals or named constants initialized with constant expressions—and must be assignable ...
所以,要说switch表达式,我们一定得从switch语句说起。 代码语言:javascript 代码运行次数:0 运行 AI代码解释 publicclassSwitchTest{@TestvoidtestSwitchStatement(){vartrafficLight=randomTrafficLight();String lightString;switch(trafficLight){caseLIGHT_RED:{lightString="红灯";break;}caseLIGHT_GREEN:{lightString...
这个是由 switch-on-String 的实现决定的。进入 switch 语句时，会调用 String 类的 hashCode() 方法...
代码改写如下：publicstaticintgetSeasonNumber4(Stringseason){if(season==null){return0;}switch(season...