Java How to convert String to List or Set

Question

How to convert String    Array  to Collection  like ArrayList or HashSet

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String   w     a    b    c    d    e       List lt String gt  wL   Arrays asList w

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Arrays asList   would do the trick here   String   words     ace    boom    crew    dog    eon        List lt String gt  wordList   Arrays asList words       For converting to Set  you can do as below  Set lt T gt  mySet   new HashSet lt T gt  Arrays asList words

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java util Arrays asList new String    a    b

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Collections addAll provides the shortest  one-line  receipt   Having  String   array     foo    bar    baz     Set lt String gt  set   new HashSet lt  gt       You can do as below  Collections addAll set  array

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It s a old code  anyway  try it   import java util Arrays  import java util List  import java util ArrayList  public class StringArrayTest      public static void main String   args             String   words     word1    word2    word3    word4    word5           List lt String gt  wordList   Arrays asList words          for  String e   wordList                   System out println e

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Whilst this isn t strictly an answer to this question I think it s useful   Arrays and Collections can bother be converted to Iterable which can avoid the need for performing a hard conversion   For instance I wrote this to join lists arrays of stuff into a string with a seperator  public static  lt T gt  String join Iterable lt T gt  collection  String delimiter        Iterator lt T gt  iterator   collection iterator        if   iterator hasNext            return          StringBuilder builder   new StringBuilder         T thisVal   iterator next        builder append thisVal    null      thisVal toString          while  iterator hasNext              thisVal   iterator next            builder append delimiter           builder append thisVal    null      thisVal toString                return builder toString        Using iterable means you can either feed in an ArrayList or similar aswell as using it with a String    parameter without having to convert either

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If you really want to use a set   String   strArray     foo    foo    bar      Set lt String gt  mySet   new HashSet lt String gt  Arrays asList strArray    System out println mySet     output    foo  bar

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The easiest way would be   String   myArray        List lt String gt  strs   Arrays asList myArray     using the handy Arrays utility class  Note  that you can even do  List lt String gt  strs   Arrays asList  a    b    c

User · Answer

The easiest way is through    Arrays asList stringArray

[java] Java: How to convert String[] to List or Set

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