One liner to check if element is in the list

Question

I have been working on and off with Java Python  Now in this situation I want to check if the element is in the list and do stuff     Python says   if  a  in   a    b    c        print  It s there     Does java provide any one liner for this rather than creating ArrayList   Set or similar data structure in steps and adding elements to it   Thanks

User · Answer

There is a boolean contains Object obj  method within the List interface   You should be able to say   if  list contains  a          System out println  It s there        According to the javadoc   boolean contains Object o   Returns true if this list contains the specified element   More formally  returns true if and only if this list contains at  least one element e such that  o  null   e  null   o equals e

User · Answer

If he really wants a one liner without any collections  OK  he can have one   for String s new String    a    b    c    if  s equals  a    System out println  It s there       smile    Isn t it ugly  Please  don t use it in real code

User · Answer

Use Arrays asList   if  Arrays asList  a   b   c   contains  a

User · Answer

I would use   if  Stream of  a   b   c   anyMatch  a   equals           Code to execute      or   Stream of  a   b   c        filter  a   equals       findAny        ifPresent ignore - gt    Code to execute

User · Answer

You can use java util Arrays binarySearch to find an element in an array or to check for its existence   import java util Arrays       char   array   new char     a    x    m    Arrays sort array    if  Arrays binarySearch array   m    gt   0        System out println  Yes  m is there        Be aware that for binarySearch to work correctly  the array needs to be sorted  Hence the call to Arrays sort   in the example  If your data is already sorted  you don t need to do that  Thus  this isn t strictly a one-liner if you need to sort your array first  Unfortunately  Arrays sort   does not return a reference to the array - thus it is not possible to combine sort and binarySearch  i e  Arrays binarySearch Arrays sort myArray   key   does not work     If you can afford the extra allocation  using Arrays asList   seems cleaner

User · Answer

In JDK7   if    a    b    c   contains  a        Assuming the Project Coin collections literals project goes through   Edit  It didn t

User · Answer

You could try using Strings with a separator which does not appear in any element   if    a b c   contains   a

User · Answer

public class Itemfound           public static void main String args                      if  Arrays asList  a   b   c   contains  a                          System out println  It is here                          This is what you looking for  The contains   method simply checks the index of element in the list  If the index is greater than  0  than element is present in the list   public boolean contains Object o    return indexOf o   gt   0

[java] One liner to check if element is in the list

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