Count lines in text file

Folks:
What's the best way to count the number of lines in a text file?
thanks,
Kevin

You can also skip the open/create, you'll still get a file dialog. I guess EOL conversion is also not needed.
So the most minumalistic code is as follows.
Has anyone done any benchmarks? Somehow I have the feeling that temporarily creating that big array of strings might not be the most efficient compared to reading all as one string and counting linefeeds. Who knows...? How big are your files?
Message Edited by altenbach on 09-29-2006 04:03 PM
LabVIEW Champion . Do more with less code and in less time .
Attachments:
CountLines.png ‏1 KB

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DATA: PAGENO(4) TYPE N VALUE 1,
      DATAKBN(2) TYPE N VALUE 1,
      SUBNO(3) TYPE N VALUE 1,
      VPAGENO(4) TYPE C,
      VDATAKBN(2) TYPE C,
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      VCODE(10) TYPE C,
      VNAME2(35) TYPE C,
      VPAYDAT(10) TYPE C,
      VSGTXT(60) TYPE C VALUE SPACE,
      VSGTXT1(10) TYPE C,
      VKINGAKU(15) TYPE C VALUE SPACE,
      VBIKKO(30) TYPE C VALUE SPACE,
      VBELNR(10) TYPE C VALUE SPACE,
      VDMBTR(15) TYPE C,
      VGLT0-KSLVT(15) TYPE C,
      VGLT0-TSL01(15) TYPE C,
      VGLT0-TSL02(15) TYPE C,
      VGLT0-TSL03(15) TYPE C,
      VGLT0-TSL04(15) TYPE C,
      VGLT0-TSL05(15) TYPE C,
      VKIN(15) TYPE C,
      VTEGA(15) TYPE C.
FORM FRM_OUTPUT_DATA.
SORT ITAB_OUTPUT_SUMMARY BY LIFNR DTYPE.
SORT ITAB_OUTPUT_ITEMS   BY LIFNR DTYPE BELNR.
IF P_DISP = 'X'."checkボクスを選ぶ場合、ファイル作成処理へ行く
OPEN DATASET E_FILE FOR OUTPUT IN TEXT MODE.
IF SY-SUBRC <> 0.
WRITE: 'error',SY-SUBRC.
EXIT.
ENDIF.
LOOP AT ITAB_LIFNR.
PERFORM LISTDATA.
PAGENO = PAGENO + 1.
SUBNO = 1.
ENDLOOP.
CLOSE DATASET E_FILE."ファイルクローズ
ENDFORM.                               " End of frm_output_data
FORM LISTDATA.
DATA:
    WK_PAY_AMOUNT LIKE BSEG-DMBTR,   " 純支払額算出用
    VWK_PAY_AMOUNT(15) TYPE C,
    GLT0-TSL05_VAL LIKE GLT0-TSL05.
READ TABLE ITAB_OUTPUT_SUMMARY
         WITH KEY   LIFNR = ITAB_LIFNR-LIFNR DTYPE = 1.
BSIK-DMBTR = ITAB_OUTPUT_SUMMARY-DMBTR * WK_RATIO.
GLT0-TSL01 = ITAB_OUTPUT_SUMMARY-DMBTR * WK_RATIO.
READ TABLE ITAB_OUTPUT_SUMMARY
         WITH KEY   LIFNR = ITAB_LIFNR-LIFNR DTYPE = 2. " 区分：2
GLT0-TSL02 = ITAB_OUTPUT_SUMMARY-DMBTR * WK_RATIO.
READ TABLE ITAB_OUTPUT_SUMMARY
         WITH KEY   LIFNR = ITAB_LIFNR-LIFNR DTYPE = 3. " 区分：3
GLT0-TSL03 = ITAB_OUTPUT_SUMMARY-DMBTR * WK_RATIO.
READ TABLE ITAB_OUTPUT_SUMMARY
         WITH KEY   LIFNR = ITAB_LIFNR-LIFNR DTYPE = 4. " 区分：4
GLT0-TSL04 = ITAB_OUTPUT_SUMMARY-DMBTR * WK_RATIO.
READ TABLE ITAB_OUTPUT_SUMMARY
         WITH KEY   LIFNR = ITAB_LIFNR-LIFNR DTYPE = 5. " 区分：5
GLT0-TSL05 = ITAB_OUTPUT_SUMMARY-DMBTR * WK_RATIO.
glt0-tsl05 = glt0-tsl05 + glt0-tsl04.
WK_PAY_AMOUNT = GLT0-TSL05 + GLT0-TSL04.
CHECK WK_SUBRC = 0.
BSEG-KOART = ' '.                    情報不要
CLEAR: BSEG-SGTXT, BSEG-DMBTR, TGSBT-GTEXT, BKPF-BELNR.
BSEG-KOART = 'Y'.                    " フラグ：ヘッダに相殺額を出力
CLEAR: BSAK-DMBTR.
READ TABLE ITAB_OUTPUT_SUMMARY
       WITH KEY   LIFNR = ITAB_LIFNR-LIFNR DTYPE = 6. " 区分：6
BSAK-DMBTR = ITAB_OUTPUT_SUMMARY-DMBTR * WK_RATIO.
WK_PAY_AMOUNT = WK_PAY_AMOUNT - BSAK-DMBTR.
WRITE : / PAGENO,
           SUBNO,
           DATAKBN,
           ITAB_LIFNR-LIFNR,
           ITAB_LIFNR-NAME2(25),
           P_PAY_T,
           GLT0-TSL01,
           GLT0-TSL02,
           GLT0-TSL03,
           GLT0-TSL04,
           GLT0-TSL05.
VPAGENO = PAGENO.
VSUBNO = SUBNO.
DATAKBN = 1.
VDATAKBN = DATAKBN.
VCODE = ITAB_LIFNR-LIFNR.
VNAME2 = ITAB_LIFNR-NAME2.
VPAYDAT = P_PAY_T.
VGLT0-TSL01 = GLT0-TSL01.
VGLT0-TSL02 = GLT0-TSL02.
VGLT0-TSL03 = GLT0-TSL03.
VGLT0-TSL04 = GLT0-TSL04.
VGLT0-TSL05 = GLT0-TSL05.
CONCATENATE VPAGENO VSUBNO VDATAKBN VCODE VNAME2 VPAYDAT VSGTXT VKINGAKU
VBIKKO VBELNR VGLT0-TSL01 VGLT0-TSL02 VGLT0-TSL03
VGLT0-TSL04 VGLT0-TSL05 INTO VREC SEPARATED BY ','.
CLEAR: BSAK-DMBTR, BSID-DMBTR, BSAD-DMBTR, BSEG-DMBTR, BSIK-DMBTR,
         WK_10 , WK_11 , GLT0-TSL05.
READ TABLE ITAB_OUTPUT_SUMMARY
       WITH KEY   LIFNR = ITAB_LIFNR-LIFNR DTYPE = 7. " 区分：7
BSID-DMBTR = ITAB_OUTPUT_SUMMARY-DMBTR * WK_RATIO.
WK_PAY_AMOUNT = WK_PAY_AMOUNT - BSID-DMBTR.
郵送料の出力処理
READ TABLE ITAB_OUTPUT_SUMMARY
       WITH KEY   LIFNR = ITAB_LIFNR-LIFNR DTYPE = 8. " 区分：8
BSAD-DMBTR = ITAB_OUTPUT_SUMMARY-DMBTR * WK_RATIO.
WK_PAY_AMOUNT = WK_PAY_AMOUNT - BSAD-DMBTR.
READ TABLE ITAB_OUTPUT_SUMMARY
       WITH KEY   LIFNR = ITAB_LIFNR-LIFNR DTYPE = 9. " 区分：9
BSEG-DMBTR = ITAB_OUTPUT_SUMMARY-DMBTR * WK_RATIO.
WK_PAY_AMOUNT = WK_PAY_AMOUNT - BSEG-DMBTR.
READ TABLE ITAB_OUTPUT_SUMMARY
         WITH KEY   LIFNR = ITAB_LIFNR-LIFNR DTYPE = 10.
WK_10 =     ITAB_OUTPUT_SUMMARY-DMBTR * WK_RATIO.
READ TABLE ITAB_OUTPUT_SUMMARY
         WITH KEY   LIFNR = ITAB_LIFNR-LIFNR DTYPE = 11.
WK_11 =     ITAB_OUTPUT_SUMMARY-DMBTR * WK_RATIO.
GLT0-TSL05 =   WK_PAY_AMOUNT - WK_10 - WK_11.
WK_PAY_AMOUNT = WK_PAY_AMOUNT - GLT0-TSL05.
   VWK_PAY_AMOUNT = WK_PAY_AMOUNT.
   VKIN = WK_10.
   VTEGA = WK_11.
   CONCATENATE VREC VWK_PAY_AMOUNT VKIN VTEGA INTO
         VRECORD SEPARATED BY ','.
   TRANSFER VRECORD TO E_FILE.
    WRITE :
            VWK_PAY_AMOUNT,
            WK_10,
            WK_11.
   WRITE:/.
BSEG-KOART = 'X'.                   " フラグ：請求金額を出力
LOOP AT ITAB_OUTPUT_ITEMS WHERE LIFNR = ITAB_LIFNR-LIFNR
                            AND   DTYPE = 5.          " 区分：5
    BSEG-SGTXT   = ITAB_OUTPUT_ITEMS-SGTXT.          " 明細テキスト
    GLT0-KSLVT   = ITAB_OUTPUT_ITEMS-DMBTR * WK_RATIO.     " 金額
    TGSBT-GTEXT = ITAB_OUTPUT_ITEMS-GTEXT.              BKPF-BELNR   = ITAB_OUTPUT_ITEMS-BELNR.
   SUBNO = SUBNO + 1.
   VSUBNO = SUBNO.
   DATAKBN = 2.
   VDATAKBN = DATAKBN.
   VGLT0-KSLVT = GLT0-KSLVT.
   VBIKKO = TGSBT-GTEXT.
   VBELNR = BKPF-BELNR.
   VSGTXT1 ='請求金額:'.
   CLEAR VRECORD.
CONCATENATE VSGTXT1 BSEG-SGTXT INTO VSGTXT.
CONCATENATE VPAGENO VSUBNO VDATAKBN VCODE VNAME2 VPAYDAT VSGTXT
VGLT0-KSLVT VBIKKO VBELNR INTO VRECORD SEPARATED BY ','.
TRANSFER VRECORD TO E_FILE.
   WRITE :/ VPAGENO,VSUBNO,VDATAKBN,'請求金額:', VSGTXT, VGLT0-KSLVT,
            VBIKKO,VBELNR.
ENDLOOP.
CLEAR: BSEG-SGTXT,GLT0-KSLVT,BKPF-BELNR.
LOOP AT ITAB_OUTPUT_ITEMS WHERE LIFNR = ITAB_LIFNR-LIFNR
                            AND   DTYPE = 6.          " 区分：6
    BSEG-SGTXT   = ITAB_OUTPUT_ITEMS-SGTXT.          " 明細テキスト
    IF ITAB_OUTPUT_ITEMS-SHKZG = CNS_CREDIT.       " 金額
      GLT0-KSLVT = ITAB_OUTPUT_ITEMS-DMBTR * WK_RATIO.
    ELSEIF ITAB_OUTPUT_ITEMS-SHKZG = CNS_DEBIT.
      GLT0-KSLVT = ITAB_OUTPUT_ITEMS-DMBTR * WK_RATIO * -1.
    ENDIF.
TGSBT-GTEXT = ITAB_OUTPUT_ITEMS-GTEXT.          " 事業領域テキスト
BKPF-BELNR   = ITAB_OUTPUT_ITEMS-BELNR.          " 伝票番号
SUBNO = SUBNO + 1.
VSUBNO = SUBNO.
DATAKBN = 3.
VDATAKBN = DATAKBN.
VGLT0-KSLVT = GLT0-KSLVT.
VBIKKO = TGSBT-GTEXT.
VBELNR = BKPF-BELNR.
VSGTXT1 ='相殺金額:'.
CLEAR VRECORD.
CONCATENATE VSGTXT1 BSEG-SGTXT INTO VSGTXT.
CONCATENATE VPAGENO VSUBNO VDATAKBN VCODE VNAME2 VPAYDAT VSGTXT
VGLT0-KSLVT VBIKKO VBELNR INTO VRECORD SEPARATED BY ','.
TRANSFER VRECORD TO E_FILE.
concatenate vpageno vsubno vdatakbn
WRITE :/ PAGENO,SUBNO,DATAKBN,'相殺金額',BSEG-SGTXT, GLT0-KSLVT,
         TGSBT-GTEXT, BKPF-BELNR.
ENDLOOP.
   CLEAR VRECORD.
*Insert empty line.
TRANSFER EMPTYREC TO E_FILE.
DATAKBN = 3.
VDATAKBN = DATAKBN.
SUBNO = SUBNO + 1.
VSUBNO = SUBNO.
VSGTXT ='源泉金額'.
VDMBTR = BSID-DMBTR.
CONCATENATE VPAGENO VSUBNO VDATAKBN VCODE VNAME2 VPAYDAT VSGTXT
VDMBTR INTO VRECORD SEPARATED BY ','.
TRANSFER VRECORD TO E_FILE.
WRITE :/ PAGENO, SUBNO,DATAKBN, ITAB_LIFNR-LIFNR,ITAB_LIFNR-NAME2,
         P_PAY_T,'源泉金額', BSID-DMBTR.
CLEAR: VDMBTR, VSGTXT, VRECORD.
SUBNO = SUBNO + 1.
VSUBNO = SUBNO.
VSGTXT = '郵送料'.
VDMBTR = BSAD-DMBTR.
CONCATENATE VPAGENO VSUBNO VDATAKBN VCODE VNAME2 VPAYDAT VSGTXT
VDMBTR INTO VRECORD SEPARATED BY ','.
TRANSFER VRECORD TO E_FILE.
WRITE :/ PAGENO, SUBNO,DATAKBN,ITAB_LIFNR-LIFNR,ITAB_LIFNR-NAME2,
         P_PAY_T,'郵送料', BSAD-DMBTR.
CLEAR: VDMBTR, VSGTXT, VRECORD.
SUBNO = SUBNO + 1.
VSUBNO = SUBNO.
VSGTXT = '振込み手数料'.
VDMBTR = BSEG-DMBTR.
CONCATENATE VPAGENO VSUBNO VDATAKBN VCODE VNAME2 VPAYDAT VSGTXT
VDMBTR INTO VRECORD SEPARATED BY ','.
TRANSFER VRECORD TO E_FILE.
CLEAR: VDMBTR, VSGTXT, VRECORD.
WRITE :/ PAGENO,SUBNO,DATAKBN,ITAB_LIFNR-LIFNR,ITAB_LIFNR-NAME2,
        P_PAY_T,'振込み手数料',BSEG-DMBTR.
*その他の支払いの処理
SUBNO = SUBNO + 1.
VSUBNO = SUBNO.
VSGTXT = 'その他の支払い'.
VDMBTR = GLT0-TSL05.
CONCATENATE VPAGENO VSUBNO VDATAKBN VCODE VNAME2 VPAYDAT VSGTXT
VDMBTR INTO VRECORD SEPARATED BY ','.
TRANSFER VRECORD TO E_FILE.
WRITE :/ PAGENO,SUBNO,DATAKBN,ITAB_LIFNR-LIFNR,ITAB_LIFNR-NAME2,
        P_PAY_T, 'その他の支払い',GLT0-TSL05.
                                 glt0-tsl05.
ULINE.
CLEAR: VREC, VRECORD,VCODE,VNAME2,VPAYDAT,VSGTXT,VSGTXT1,VKINGAKU.
CLEAR: VBIKKO,VBELNR,VDMBTR,VGLT0-KSLVT,VGLT0-TSL01,VGLT0-TSL02.
CLEAR: VGLT0-TSL03,VGLT0-TSL04,VGLT0-TSL05,VKIN,VTEGA,VWK_PAY_AMOUNT.
ENDFORM.

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The text I am writing is taken from another text file using the FileReader and BufferedReader classes.
The text is reading from the file, and will also output to the new text file, however it won't insert a new line, it only inserts an 'unprintable' character i.e. an empty square
My code is below - its only starting out so its farily simple at the moment, just reading from one file and outputting to another.
Is there a way i can get the actual new line/carriage return inserted instead of the empty square. (im running Windows XP)
Thanks in advance
import java.io.*;
public class Pad {
private String inputPath;
private String outputPath;
/** Creates a new instance of Pad */
public Pad() {
inputPath = "C:\\OUTBOUND.TXT";
outputPath = "C:\\04'06.txt";
* @param args the command line arguments
public static void main(String[] args) {
// TODO code application logic here
System.out.println("PAD File");
//Read PAD File
Pad p = new Pad();
p.readPADFile(p.inputPath, p.outputPath);
public void readPADFile(String inputPath, String outputPath)
inputPath = this.inputPath;
outputPath = this.outputPath;
//System.out.println(inputPath);
int recordCount = 0;
String record = null;
try
FileReader fr = new FileReader(inputPath);
FileWriter fw = new FileWriter(outputPath);
BufferedReader br = new BufferedReader(fr);
BufferedWriter bw = new BufferedWriter(fw);
record = new String();
while((record = br.readLine())!=null)
recordCount++;
//System.out.println(recordCount + ": " + record);
bw.write(record + "\n");
bw.close();
br.close();
fw.close();
fr.close();
}catch(IOException e)
System.out.println("IOException Error");
e.printStackTrace();
System.out.println(e.toString());
}

I assume by using the
System.getProperty("line.separator") that this will
work independent of platform.Yes. And using bw.println() instead of bw.print() will already do it for you. So all you need to change in your program are two letters.

Blank line in text file after download

Hi all,
i am using the below code to get the 254 blank spaces at the end of the text file & it's comming correctly.
generally i am downloading 2 lines in the original program & i am getting one blank line in between these two lines.
The main thing is that i am getting this blank line when i run this program in my office computer. But i am not getting this blank line when i run this same program in my home laptop. Please suggest why this blank line is appearing & any solution ?
DATA: BEGIN OF OUTTAB OCCURS 100,
        PROD_CODE(3),
        LINE_DETL(2043),
      END OF OUTTAB.
DATA:V_OUTPUT(2043).
DATA: space_character type c.
space_character = CL_ABAP_CHAR_UTILITIES=>MINCHAR.
        DO 254 times.
           CONCATENATE V_OUTPUT space_character INTO V_OUTPUT.
           ENDDO.
           OUTTAB-LINE_DETL = V_OUTPUT.APPEND OUTTAB.
call function 'GUI_DOWNLOAD'
   EXPORTING
      filename = OUTFILE1
      filetype = 'ASC'
      TABLES
      data_tab = OUTTAB

I don't think this is issue of ABAP. Any way just to check download the file on laptop and open same file and office computer
if file looks ok then it is OS or text editor issue.
Thanks,
AK.

How to replace a line ina text file using java?

Hi ALL,
Does anybody know how to replace a line in a text file uisng java.

use this thing:
http://doesthatevencompile.com/current-projects/code-sniplets/ASCIIFile.htm
open the file,
read its contents, replace the text you need in the contents, set the contents back into the file.
it takes care of the IO for you.

How Can I replace line in text file

I have a text file like following format
1
bvhhk
g1
2
bvgjvh
g1
3
mmm,mvb
g2
I want to replace 2 nd line to " prasad" and after replacing it should be following format
1
prasad
g1
2
bvgjvh
g1
3
mmm,mvb
g2
I try above change using following code segment and it is not work.
static void modifyEmployeeDetails(String file_name){
try{
     InputStreamReader reader= new InputStreamReader(System.in);
     BufferedReader buff=new BufferedReader(reader);
     FileReader read=new FileReader(file_name);
     BufferedReader buffer=new BufferedReader(read);
     FileWriter w=new FileWriter(file_name,true);
     PrintWriter write = new PrintWriter(w);
     System.out.print("Employee No : ");
     String No=buff.readLine();
boolean eof = false;
while (!eof) {
String tep=buffer.readLine();
if(tep.equals(No)){
eof = true;
System.out.print("Name : ");
temp=buff.readLine();
System.out.println("No");
write.println(temp);
System.out.print("Group No : ");
temp=buff.readLine();
write.println(temp);
}catch(Exception e){
System.out.println(e);
Please correct If it is wrong and help me as soon as possible
Thank you...............

hi,
I have a different approach of the solution to your problem.
suppose you have entries in your file without any extra line feed between each two entries.
the following program entirely reads your data into a bean list, changes a specific bean attribute and writes it to your data source.
(you should adapt it to your needs)
import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
public class FileReplace {
     public List<MyBean> readFile(BufferedReader in) throws IOException{
          String line;
          List<MyBean> beanList = new ArrayList<MyBean>();
          MyBean bean = null;
          int i=0;
          while((line=in.readLine())!=null){
               if(line.trim().equals("***")){
                    beanList.add(bean);
                    i = 0;
               }else{
                    switch (i) {
                    case 0:
                         bean = new MyBean();
                         bean.setAttribute1(line);
                         i++;
                         break;
                    case 1:
                         bean.setAttribute2(line);
                         i++;
                         break;
                    case 2:
                         bean.setAttribute3(line);
                         i++;
                         break;
                    default:
                         break;
          return beanList;
     public void writeToFile(List<MyBean> beanList, String outputFilePath) throws IOException{
          FileWriter out = new FileWriter(outputFilePath);
          for (int i = 0; i < beanList.size(); i++) {
               out.write(beanList.get(i).toString());
          out.flush();
          out.close();
     public void test(){
          //BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
          String filePath = "D:/file.txt";
          try {
               BufferedReader in = new BufferedReader(new FileReader(filePath));
               //read data
               List<MyBean> beanList = readFile(in);
               // edit a bean attribute
               beanList.get(0).setAttribute2("prasad");
               //write beans back to file
               writeToFile(beanList, filePath);
          } catch (FileNotFoundException e) {
               e.printStackTrace(); //handle appropriately this exception
          } catch (IOException e) {
               e.printStackTrace();//handle appropriately this exception
          }catch (Exception e) {
               e.printStackTrace();//handle appropriately this exception
     class MyBean{
          String attribute1;
          String attribute2;
          String attribute3;
          public final static int ATTRS_NUMBER = 3;
          public String getAttribute1() {
               return attribute1;
          public void setAttribute1(String attribute1) {
               this.attribute1 = attribute1;
          public String getAttribute2() {
               return attribute2;
          public void setAttribute2(String attribute2) {
               this.attribute2 = attribute2;
          public String getAttribute3() {
               return attribute3;
          public void setAttribute3(String attribute3) {
               this.attribute3 = attribute3;
          @Override
          public String toString() {
               return attribute1+"\n"+attribute2+"\n"+attribute3+"\n***\n";
     public static void main(String[] args) {
          FileReplace instance = new FileReplace();
          instance.test();
}hope it helps

How to read long line from text file

Hi,
I just faced problem when reading a big text file.
BufferedReader br = new BufferedReader(new FileReader("D:\\afile.txt"));
String str;
int i;
while ((str = br.readLine())!=null)
i++;
//do some work here...
...This code throws exception:
Exception in thread "main" java.lang.OutOfMemoryError: Java heap spaceSo I thought file line is very long. When I opened it in FAR it only displays no more than 4096 characters as a line.
Help me to read a text file that's line is very long?

try,
$ java -X
-Xmixed mixed mode execution (default)
-Xint interpreted mode execution only
-Xbootclasspath:<directories and zip/jar files separated by ;>
set search path for bootstrap classes and resources
-Xbootclasspath/a:<directories and zip/jar files separated by ;>
append to end of bootstrap class path
-Xbootclasspath/p:<directories and zip/jar files separated by ;>
prepend in front of bootstrap class path
-Xnoclassgc disable class garbage collection
-Xincgc enable incremental garbage collection
-Xloggc:<file> log GC status to a file with time stamps
-Xbatch disable background compilation
-Xms<size> set initial Java heap size
-Xmx<size> set maximum Java heap size
-Xss<size> set java thread stack size
-Xprof output cpu profiling data
-Xrunhprof[:help]|[:<option>=<value>, ...]
perform JVMPI heap, cpu, or monitor profiling
-Xdebug enable remote debugging
-Xfuture enable strictest checks, anticipating future default
-Xrs reduce use of OS signals by Java/VM (see documentation)
-Xcheck:jni perform additional checks for JNI functions
The -X options are non-standard and subject to change without notice.

Count lines in text file

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