Store text file content line by line into array

Question

all I m now facing the problem of no idea on storing the content in text file into the array  The situation is like  text file content    abc1 xyz2 rxy3   I wish to store them into array line by line  is that possible  What I expect is like this   arr 0    abc1 arr 1    xyz2 arr 2    rxy3   I ve try something like this  but seem like not work for me  If anyone can help me  really thanks a lot   The code is    BufferedReader in   new BufferedReader new FileReader  path of text             String str           while  str   in readLine       null               String   arr   str split                   for int i 0   i lt str length     i                     arr i    in readLine

User · Answer

Just use Apache Commons IO  List lt String gt  lines   IOUtils readLines new FileInputStream  path of text

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JAVA 8   Files lines new File  quot  home abdennour path to file txt quot   toPath    collect Collectors toList

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This should work because it uses List as you don t know how many lines will be there in the file and also they may change later    BufferedReader in   new BufferedReader new FileReader  path of text     String str null  ArrayList lt String gt  lines   new ArrayList lt String gt     while  str   in readLine       null       lines add str     String   linesArray   lines toArray new String lines size

User · Answer

When you do str   in readLine       null you read one line into str variable and if it s not null execute the while block  You do not need to read the line one more time in arr i    in readLine     Also use lists instead of arrays when you do not know the exact size of the input file  number of lines    BufferedReader in   new BufferedReader new FileReader  path of text     String str   List lt String gt  output   new LinkedList lt String gt      while  str   in readLine       null       output add str      String   arr   output toArray new String output size

User · Answer

You can use this code  This works very fast  public String   loadFileToArray String fileName  throws IOException       String s   new String Files readAllBytes Paths get fileName         return Arrays stream s split  quot  n quot    toArray String    new

User · Answer

You need to do something like this for your case -  int i   0  while  str   in readLine       null       arr i    str      i        But note that the arr should be declared properly  according to the number of entries in your file   Suggestion - Use a List instead Look at  Kevin Bowersox post for that

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Try this   String   arr   new String 3     if size is fixed otherwise use ArrayList  int i 0  while  str   in readLine       null                arr i      str   System out println Arrays toString arr

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I would recommend using an ArrayList  which handles dynamic sizing  whereas an array will require a defined size up front  which you may not know   You can always turn the list back into an array   BufferedReader in   new BufferedReader new FileReader  path of text     String str   List lt String gt  list   new ArrayList lt String gt     while  str   in readLine       null       list add str      String   stringArr   list toArray new String 0

User · Answer

Suggest use Apache IOUtils readLines for this  See link below   http   commons apache org proper commons-io apidocs org apache commons io IOUtils html

User · Answer

You can use this full code for your problem   For more details you can check it on appucoder com  class FileDemoTwo      public static void main String args   throws Exception          FileDemoTwo ob   new FileDemoTwo            BufferedReader in   new BufferedReader new FileReader  read txt             String str          List lt String gt  list   new ArrayList lt String gt             while  str  in readLine       null                list add str                     String   stringArr   list toArray new String 0            System out println     Arrays toString stringArr

User · Answer

The simplest solution   List lt String gt  list   Files readAllLines Paths get  path of text    StandardCharsets UTF 8   String   a   list toArray new String list size         Note that java nio file Files is since 1 7

[java] Store text file content line by line into array

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