How to check if a string starts with one of several prefixes

Question

I have the following if statement   String newStr4   strr split  2012   0   if  newStr4 startsWith  Mon          str4 add newStr4       I want it to include startsWith  Mon Tues Weds Thurs Friday etc  Is there a simple way to this when using strings  I tried    but it didn t work

User · Answer

No one mentioned Stream so far  so here it is   if  Stream of  Mon    Tues    Wed    Thurs    Fri   anyMatch s - gt  newStr4 startsWith s

User · Answer

Of course  be mindful that your program will only be useful in english speaking countries if you detect dates this way   You might want to consider     Set lt String gt  dayNames   Calendar getInstance     getDisplayNames Calendar DAY OF WEEK        Calendar SHORT        Locale getDefault      keySet      From there you can use  startsWith or  matches or whatever other method that others have mentioned above   This way you get the default locale for the jvm   You could always pass in the locale  and maybe default it to the system locale if it s null  as well to be more robust

User · Answer

A simple solution is   if  newStr4 startsWith  Mon      newStr4 startsWith  Tue      newStr4 startsWith  Wed           you get the idea       A fancier solution would be   List lt String gt  days   Arrays asList  SUN    MON    TUE    WED    THU    FRI    SAT    String day   newStr4 substring 0  3  toUpperCase    if  days contains day

User · Answer

Do you mean this   if  newStr4 startsWith  Mon      newStr4 startsWith  Tues             Or you could use regular expression   if  newStr4 matches   Mon Tues Wed Thurs Fri

User · Answer

When you say you tried to use OR  how exactly did you try and use it  In your case  what you will need to do would be something like so   String newStr4   strr split  2012   0   if newStr4 startsWith  Mon      newStr4 startsWith  Tues       str4 add newStr4

User · Answer

if newStr4 startsWith  Mon      newStr4 startsWith  Tues      newStr4 startsWith  Weds      etc    You need to include the whole str startsWith otherStr  for each item  since    only works with boolean expressions  true or false    There are other options if you have a lot of things to check  like regular expressions  but they tend to be slower and more complicated regular expressions are generally harder to read   An example regular expression for detecting day name abbreviations would be   if Pattern matches  Mon Tues Wed Thurs Fri   stringToCheck

User · Answer

Besides the solutions presented already  you could use the Apache Commons Lang library   if StringUtils startsWithAny newStr4  new String     Mon   Tues               whatever     Update  the introduction of varargs at some point makes the call simpler now   StringUtils startsWithAny newStr4   Mon    Tues

[java] How to check if a string starts with one of several prefixes?

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