How to convert an int array to String with toString method in Java

Question

I am using trying to use the toString int    method  but I think I am doing it wrong   http   docs oracle com javase 1 5 0 docs api java util Arrays html toString int     My code   int   array   new int lnr getLineNumber     1   int i   0   System out println array toString       The output is    I 23fc4bec   Also I tried printing like this  but   System out println new String   toString array          error on next line   The method toString   in the type String is not applicable for the arguments  int      I took this code out of bigger and more complex code  but I can add it if needed  But this should give general information   I am looking for output  like in Oracle s documentation      The string representation consists of a list of the array s elements  enclosed in square brackets         Adjacent elements are separated by the characters       a comma followed by a space

User · Answer

Using the utility I describe here  you can have a more control over the string representation you get for your array   String   s      hello    world     RichIterable lt String gt  r   RichIterable from s   r mkString                       gives  hello  world  r mkString                       gives  hello   world  r mkString   lt              gt        gives   lt  hello  world  gt

User · Answer

The toString method on an array only prints out the memory address  which you are getting  You have to loop though the array and print out each item by itself  for int i   array     System println i

User · Answer

What you want is the Arrays toString int    method  import java util Arrays   int   array   new int lnr getLineNumber     1   int i   0             System out println Arrays toString array     There is a static Arrays toString helper method for every different primitive java type  the one for int   says this   public static String toString int   a   Returns a string representation of the contents of the specified array  The string representation consists of a list of the array s elements  enclosed in square brackets   quot    quot    Adjacent elements are separated by the characters  quot    quot   a comma followed by a space   Elements are converted to strings as by String valueOf int   Returns  quot null quot  if a is null

User · Answer

Here s an example of going from a list of strings  to a single string  back to a list of strings    Compiling     javac test java   java test   Running        Initial list            abc           def           ghi           jkl           mno       As single string             abc  def  ghi  jkl  mno        Reconstituted list            abc           def           ghi           jkl           mno    Source code   import java util    public class test        public static void main String   args            List lt String gt  listOfStrings  new ArrayList lt  gt             listOfStrings add  abc            listOfStrings add  def            listOfStrings add  ghi            listOfStrings add  jkl            listOfStrings add  mno             show   nInitial list    listOfStrings            String singleString   listOfStrings toString             show  As single string    singleString            List lt String gt  reconstitutedList   Arrays asList               singleString substring 0  singleString length   - 1                     substring 1  split     s                 show  Reconstituted list    reconstitutedList              public static void show String title  Object operand            System out println title     n            if  operand instanceof String                System out println            operand                    else               for  String string    List lt String gt  operand                  System out println            string                            System out println   n

User · Answer

System out println array toString       should be   System out println Arrays toString array

User · Answer

Very much agreed with  Patrik M  but the thing with Arrays toString is that it includes     and     and     in the output  So I ll simply use a regex to remove them from outout like this  String strOfInts   Arrays toString intArray  replaceAll              s          and now you have a String which can be parsed back to java lang Number  for example    long veryLongNumber   Long parseLong intStr     Or you can use the java 8 streams  if you hate regex   String strOfInts   Arrays              stream intArray               mapToObj String  valueOf               reduce  a  b  - gt  a concat      concat b                get

User · Answer

This function returns a array of int in the string form like  6097321041141011026   private String IntArrayToString byte   array            String strRet             for int i   array                strRet  Integer toString i                     return strRet

User · Answer

You can use java util Arrays   String res   Arrays toString array   System out println res     Output    1  2  3  4  5  6  7  8  9  10

[java] How to convert an int array to String with toString method in Java

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