Convert array of strings into a string in Java

Question

I want the Java code for converting an array of strings into an string

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String   strings   new String 25000   for  int i   0  i  lt  25000  i    strings i     1234567    String result  result       for  String s   strings  result    s    linear    5s  result       for  String s   strings  result   result concat s     linear  concat  2 5s  result   String join     strings     Java 8  join  3ms  Public String join String delimiter  String   s        int ls   s length      switch  ls                case 0  return             case 1  return s 0           case 2  return s 0  concat delimiter  concat s 1            default              int l1   ls   2              String   s1   Arrays copyOfRange s  0  l1                String   s2   Arrays copyOfRange s  l1  ls                return join delimiter  s1  concat delimiter  concat join delimiter  s2            result   join     strings      Divide amp Conquer join  7ms   If you don t have the choise but to use Java 6 or 7 then you should use Divide amp Conquer join

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I like using Google s Guava Joiner for this  e g    Joiner on       skipNulls   join  Harry   null   Ron    Hermione      would produce the same String as   new String  Harry  Ron  Hermione      ETA  Java 8 has similar support now   String join        Harry    Ron    Hermione      Can t see support for skipping null values  but that s easily worked around

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You want code which produce string from arrayList    Iterate through all elements in list and add it to your String result   you can do this in 2 ways  using String as result or StringBuffer StringBuilder    Example   String result       for  String s   list        result    s         but this isn t good practice because of performance reason  Better is using StringBuffer  threads safe  or StringBuilder which are more appropriate to adding Strings

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From Java 8  the simplest way I think is       String   array      cat    mouse         String delimiter           String result   String join delimiter  array     This way you can choose an arbitrary delimiter

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Use Apache Commons  StringUtils library s join method   String   stringArray     a   b   c    StringUtils join stringArray

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Try the Arrays toString overloaded methods   Or else  try this below generic implementation   public static void main String    args  throws Exception        String   array     ABC    XYZ    PQR         System out println new Test   join array             public  lt T gt  String join T   array  String cement        StringBuilder builder   new StringBuilder         if array    null    array length    0            return null             for  T t   array            builder append t  append cement              builder delete builder length   - cement length    builder length          return builder toString

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With control over the delimiter  Java 8    String str   String join  quot   quot   arr       or  lt 8  StringBuilder builder   new StringBuilder    for String s   arr        builder append s     String str   builder toString     Alternatively  if you just want a  quot debug-style quot  dump of an array  String str   Arrays toString arr    And if you re coming from the Android angle  String str   TextUtils join  quot   quot   arr    You can modify the above depending on what characters  if any  you want in between strings  You may see near identical code to the pre-Java 8 code but using StringBuffer - StringBuilder is a newer class that s not thread-safe  but therefore has better performance in a single thread because it does away with unneeded synchronization  In short  you re better using StringBuilder in 99  of cases - functionality wise  the two are identical  DON T use a string and just append to it with    like some of the answers show here  This sends the GC through the roof because you re creating and throwing away as many string objects as you have items in your array  For small arrays you might not really notice the difference  but for large ones it can be orders of magnitude slower

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If you know how much elements the array has  a simple way is doing this   String appendedString        array 0         array 1         array 2         array 3

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Use Apache commons StringUtils join     It takes an array  as a parameter  and also has overloads for Iterable and Iterator parameters  and calls toString   on each element  if it is not null  to get each elements string representation   Each elements string representation is then joined into one string with a separator in between if one is specified   String joinedString   StringUtils join new Object    a    b   1    -    System out println joinedString     Produces   a-b-1

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You could do this  given an array a of primitive type   StringBuffer result   new StringBuffer    for  int i   0  i  lt  a length  i         result append  a i          result append  optional separator      String mynewstring   result toString

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Following is an example of Array to String conversion           public class ArrayToString               public static void main String   args                        String   strArray   new String    Java    PHP     NET    PERL    C    COBOL             String newString   Arrays toString strArray            newString   newString substring 1  newString length  -1            System out println  New New String      newString

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String array     one   two    String s      for int i 0 i lt array length i        s s array i      System out print s

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Try the Arrays deepToString method   Returns a string representation of the  deep contents  of the specified      array   If the array contains other arrays as elements  the string      representation contains their contents and so on   This method is      designed for converting multidimensional arrays to strings

[java] Convert array of strings into a string in Java

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