Using two values for one switch case statement

Question

In my code  the program does something depending on the text entered by the user  My code looks like   switch  name            case text1                  blah             break                    case text2                  blah             break                    case text3                  blah             break                    case text4                  blah             break              However  the code inside cases text1 and text4 is the same  I was therefore wondering if it would be possible for me to implement something like  case text1  text4                  blah             break              I know that the    operator won t work in the case statement but is there something similar I can use

User · Answer

you can do like    case text1  case text4                  blah             break

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The case values are just codeless  goto  points that can share the same entry point      case text1    case text4            Do something       break        Note that the braces are redundant

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Java 12 and above switch  name        case text1  text4 - gt     do something       case text2  text3  text 5 - gt     do something else       default - gt     default case      You can also assign a value through the switch case expression   String text   switch  name        case text1  text4 - gt   quot hello quot        case text2  text3  text5 - gt   quot world quot        default - gt   quot goodbye quot        quot yield quot  keyword It allows you to return a value by the switch case expression String text   switch  name        case text1  text4 - gt          yield  quot hello quot       case text2  text3  text5 - gt          yield  quot world quot       default - gt          yield  quot goodbye quot

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You can use have both CASE statements as follows     case text1     case text4                 blah             break              SEE THIS EXAMPLE The code example calculates the number of days in a particular month   class SwitchDemo       public static void main String   args             int month   2          int year   2000          int numDays   0           switch  month                case 1              case 3              case 5              case 7              case 8              case 10              case 12                  numDays   31                  break              case 4              case 6              case 9              case 11                  numDays   30                  break              case 2                  if    year   4    0   amp  amp                          year   100    0                            year   400    0                       numDays   29                  else                     numDays   28                  break              default                  System out println  Invalid month                     break                    System out println  Number of Days                                  numDays             This is the output from the code   Number of Days   29   FALLTHROUGH      Another point of interest is the break statement  Each break statement   terminates the enclosing switch statement  Control flow continues with   the first statement following the switch block  The break statements   are necessary because without them  statements in switch blocks fall   through  All statements after the matching case label are executed in   sequence  regardless of the expression of subsequent case labels    until a break statement is encountered    EXAMPLE CODE   public class SwitchFallThrough        public static void main String   args            java util ArrayList lt String gt  futureMonths               new java util ArrayList lt String gt              int month   8           switch  month                case 1   futureMonths add  January                case 2   futureMonths add  February                case 3   futureMonths add  March                case 4   futureMonths add  April                case 5   futureMonths add  May                case 6   futureMonths add  June                case 7   futureMonths add  July                case 8   futureMonths add  August                case 9   futureMonths add  September                case 10  futureMonths add  October                case 11  futureMonths add  November                case 12  futureMonths add  December                default  break                     if  futureMonths isEmpty                  System out println  Invalid month number              else               for  String monthName   futureMonths                   System out println monthName                                     This is the output from the code   August September October November December   Using Strings in switch Statements     In Java SE 7 and later  you can use a String object in the switch   statement s expression  The following code example      displays the number of the month based on the value of the String   named month    public class StringSwitchDemo        public static int getMonthNumber String month             int monthNumber   0           if  month    null                return monthNumber                     switch  month toLowerCase                  case  january                   monthNumber   1                  break              case  february                   monthNumber   2                  break              case  march                   monthNumber   3                  break              case  april                   monthNumber   4                  break              case  may                   monthNumber   5                  break              case  june                   monthNumber   6                  break              case  july                   monthNumber   7                  break              case  august                   monthNumber   8                  break              case  september                   monthNumber   9                  break              case  october                   monthNumber   10                  break              case  november                   monthNumber   11                  break              case  december                   monthNumber   12                  break              default                   monthNumber   0                  break                     return monthNumber             public static void main String   args             String month    August            int returnedMonthNumber               StringSwitchDemo getMonthNumber month            if  returnedMonthNumber    0                System out println  Invalid month              else               System out println returnedMonthNumber                       The output from this code is 8   FROM Java Docs

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JEP 354  Switch Expressions  Preview  in JDK-13 and JEP 361  Switch Expressions  Standard  in JDK-14 will extend the switch statement so it can be used as an expression    Now you can    directly assign variable from switch expression   use new form of switch label  case L - gt        The code to the right of a  case L -   switch label is restricted to be an expression  a block  or  for convenience  a throw statement   use multiple constants per case  separated by commas   and also there are no more value breaks      To yield a value from a switch expression  the break with value statement is dropped in favor of a yield statement     So the demo from one of the answers might look like this   public class SwitchExpression      public static void main String   args          int month   9        int year   2018        int numDays   switch  month            case 1  3  5  7  8  10  12 - gt  31          case 4  6  9  11 - gt  30          case 2 - gt              if  java time Year of year  isLeap                  System out println  Wow  It s leap year                 yield 29              else               yield 28                                default - gt              System out println  Invalid month               yield 0                           System out println  Number of Days       numDays

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The brackets are unnecessary  Just do  case text1  case text4    doSomethingHere      break  case text2    doSomethingElse     break    If anyone is curious  this is called a case fallthrough  The ability to do this is the reason why break  is necessary to end case statements   For more information  see the wikipedia article http   en wikipedia org wiki Switch statement

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You can use   case text1  case text4        do stuff       break

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With the integration of JEP 325  Switch Expressions  Preview  in JDK-12 early access builds  one can now make use of the new form of the switch label as  -  case text1  text4 - gt           blah      or to rephrase the demo from one of the answers  something like  -  public class RephraseDemo        public static void main String   args            int month   9          int year   2018          int numDays   0           switch  month                case 1  3  5  7  8  10  12 - gt                   numDays   31                            case 4  6  9  11 - gt                   numDays   30                            case 2 - gt                   if    year   4    0   amp  amp                            year   100    0                               year   400    0                       numDays   29                  else                     numDays   28                            default - gt                   System out println  Invalid month                                      System out println  Number of Days       numDays             Here is how you can give it a try - Compile a JDK12 preview feature with Maven

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The case values are just codeless  goto  points that can share the same entry point   case text1  case text4         blah     break    Note that the braces are redundant

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The fallthrough answers by others are good ones    However another approach would be extract methods out of the contents of your case statements and then just call the appropriate method from each case   In the example below  both case  text1  and case  text4  behave the same   switch  name            case text1                method1                break                    case text2                method2                break                    case text3                method3                break                    case text4                method1                break              I personally find this style of writing case statements more maintainable and slightly more readable  especially when the methods you call have good descriptive names

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Just do  case text1  case text4        do stuff       break

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Fall through approach is the best one i feel   case text1  case text4              Yada yada         break

[java] Using two values for one switch case statement

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