Java return if trimmed String in List contains String

Question

In Java  I want to check whether a String exists in a List lt String gt  myList   Something like this   if myList contains  A           true  else         false     The problem is myList can contain un-trimmed data       A    B        C       I want it to return true if my item  B  is in the list   How should I do this   I would like to avoid a looping structure

User · Answer

String search    A   for String s   myList      if s contains search   return true  return false    This will iterate over each string in the list  and check if it contains the string you re looking for  If it s only spaces you want to trap for  you can do this   String search    A   for String s   myList      if s replaceAll         contains search   return true  return false    which will first replace spaces with empty strings before searching  Additionally  if you just want to trim the string first  you can do   String search    A   for String s   myList      if s trim   contains search   return true  return false

User · Answer

You can use your own code  You don t need to use the looping structure  if you don t want to use the looping structure as you said above  Only you have to focus to remove space or trim the String of the list   If you are using java8 you can simply trim the String using the single line of the code   myList   myList stream   map String    trim  collect Collectors toList       The importance of the above line is  in the future  you can use a List or set as well  Now you can use your own code   if myList contains  A           true  else         false

User · Answer

You need to iterate your list and call String trim for searching   String search    A   for String str  myList        if str trim   contains search          return true    return false    OR if you want to perform ignore case search  then use   search   search toLowerCase       outside loop     inside the loop if str trim   toLowerCase   contains search

User · Answer

You may be able to use an approximate string matching library to do this  e g  SecondString  but that is almost certainly overkill - just use one of the for-loop answers provided instead

User · Answer

You can do it in a single line by using regex   if  myList toString   matches      bA  b        This code should perform quite well     BTW  you could build the regex from a variable  like this    matches         b    word      b        I added   and   to each end to prevent a false positive match when the search term contains an open close square bracket at the start end

User · Answer

With Java 8 Stream API   List lt String gt  myList   Arrays asList    A    B        C      return myList stream   anyMatch str - gt  str trim   equals  B

User · Answer

Try this   for String str  myList        if str trim   equals  A           return true    return false    You need to use str equals or str equalsIgnoreCase instead of contains because contains in string works not the same as contains in List  List lt String gt  s   Arrays asList  BAB    SAB    DAS    s contains  A       false  BAB  contains  A       true

[java] Java, return if trimmed String in List contains String

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