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Array Java programming: source code sample for simple Java arrays.

How to read lines of a text file into a very simple fixed size array. Also shows how to sort the array content alphabetically, and how to write array content as another text file.

   Java array source code example:
   -  read text file into a simple array
   -  with fixed maximum number of lines
   -  sort the array
   -  write array content into another text file.

   Put this text into a file


public class tmp1
   // how many text lines can this program read?
   int MAX_TEXT_LINES = 1000; // up to 1000 lines

   // static start point (no object yet)
   public static void main(String args[]) throws Throwable
      { new tmp1().main2(args); }

   // dynamic start point (on a single object)
   public int main2(String args[]) throws Throwable
      if (args.length < 2)
         return 9+perr("supply in- and output filename.");

      String sInFile  = args[0];
      String sOutFile = args[1];

      // very simple static array for text storage:
      String aTextData[] = new String[MAX_TEXT_LINES+10];
      // +10 are safety spaces, to avoid crash on off-by-one errors.

      int iTextSize = MAX_TEXT_LINES;  // how large is the array
      int iTextUsed = 0;               // how many lines contained

      // read input file into the array.
      BufferedReader fin = new BufferedReader(
         new InputStreamReader(
             new FileInputStream(args[0]), "ISO-8859-1"
             // or US-ASCII,UTF-8,UTF-16BE,UTF-16LE,UTF-16

      while (true)
         String sLine = fin.readLine();
         if (sLine == null)
            break; // end of file

         // check if array has space for another line
         if (iTextUsed >= iTextSize)
            { perr("overflow: too many text lines\n"); break; }

         aTextData[iTextUsed] = sLine;



      // do some processing on the array contents
      processData(aTextData, iTextUsed, iTextSize);

      // write the whole array to output file.
      PrintWriter fout = new PrintWriter(
         new OutputStreamWriter(
             new FileOutputStream(args[1]), "ISO-8859-1"

      for (int iLine=0; iLine<iTextUsed; iLine++)


      return 0;

   // processing example: sort array text lines alphabetically
   // with the simplest possible sorting algorithm (bubblesort).
   int processData(String aText[], int iLinesUsed, int iLinesAlloced)
      int iOuterIdx, iInnerIdx;

      for (iOuterIdx=0; iOuterIdx<iLinesUsed; iOuterIdx++)
         for (iInnerIdx=iOuterIdx+1; iInnerIdx<iLinesUsed; iInnerIdx++)
            String sLine1 = aText[iOuterIdx];
            String sLine2 = aText[iInnerIdx];

            if (sLine1.compareTo(sLine2) > 0)
               // swap both lines
               aText[iOuterIdx] = sLine2;
               aText[iInnerIdx] = sLine1;

      print("sorted "+iLinesUsed+" lines.\n");

      return 0;

   // alternative processing example: sort using the Arrays class
   int processData2(String aText[], int iLinesUsed, int iLinesAlloced)
      java.util.Arrays.sort(aText, 0, iLinesUsed);
      return 0;

   // helper functions for better readability
   static int perr(String s)
      { System.err.print("error: "+s); return 0; }

   static int print(String s)
      { System.out.print(s); return 0; }
// See also: Java example for variable sized array .
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