Uploaded image for project: 'JDK'
  1. JDK
  2. JDK-6640604

(scanner) Behaviour of Scanner.findInLine() differs between Java 5 and Java 6

    XMLWordPrintable

    Details

    • Type: Bug
    • Status: Open
    • Priority: P4
    • Resolution: Unresolved
    • Affects Version/s: 6u3
    • Fix Version/s: None
    • Component/s: core-libs
    • Labels:
    • Subcomponent:
    • CPU:
      other
    • OS:
      generic

      Description

      OPERATING SYSTEM(S):
      All platforms.

      FULL JDK VERSION(S):
      java version "1.6.0_03"
      Java(TM) SE Runtime Environment (build 1.6.0_03-b05)
      Java HotSpot(TM) Client VM (build 1.6.0_03-b05, mixed mode)

      DESCRIPTION:
      The java.util.Scaner class behaves differently between Java5 and Java6.

      This may or may not be related to the change described by 6269946.

      Reproduction instructions:

      1. Compile the attached testcase.
      2. Run the testcase on a 5.0 JRE: "java ShowBug inputfile.txt"
      3. Run the testcase on a 6 JRE: "java ShowBug inputfile.txt"
      4. Note the differing output.


      Example results:

      Java 5:
      c:\>java ShowBug inputfile.txt
      Start found
      Middle found
      End found
      dropped out, next is END

      Java 6:
      c:\>java ShowBug inputfile.txt
      Start found
      dropped out, next is MIDDLE


      Testcase Source:

      ---------------------------------------------------------------
      ShowBug.java
      ---------------------------------------------------------------
      import java.util.regex.*;

      import java.io.File;
      import java.io.FileNotFoundException;
      import java.util.NoSuchElementException;
      import java.util.Scanner;

      public class ShowBug {

          public static void main(String[] args) {

              if (args.length > 0)
                  readFile(args[0]);
              else
                  readFile(null);

          }

          private static void readFile(String fileName) {
              Scanner scanner=null;

              if ( fileName == null) {
                  scanner = new Scanner(System.in);
              } else {

                  try {
                      File file = new File(fileName);
                      scanner = new Scanner(file);
                  } catch (FileNotFoundException e) {
                      System.err.printf("Can't find %s file , quiting\n", fileName);
                      System.exit(1);
                  }
              }

              if (scanner. findWithinHorizon("START",0) == null) {
                  System.err.println("Can't find start");
                  System.exit(1);
              }


              System.out.printf("Start found\n");

              while (scanner.findInLine("MIDDLE") != null) {
                  // while (scanner.findWithinHorizon("MIDDLE",0) != null) {

                  System.out.println("Middle found");

                  if (scanner.hasNext("END")) {
                      System.out.printf("End found\n");
                      break;
                  }
              }

              System.out.printf("dropped out, next is %s\n", scanner.next());


              scanner.close();
          }
      }
      ---------------------------------------------------------------

      ---------------------------------------------------------------
      inputfile.txt
      ---------------------------------------------------------------
      START
      MIDDLE
      END
      stuff after end
      ---------------------------------------------------------------

        Attachments

          Activity

            People

            Assignee:
            sherman Xueming Shen
            Reporter:
            elarsen Erik Larsen (Inactive)
            Votes:
            0 Vote for this issue
            Watchers:
            0 Start watching this issue

              Dates

              Created:
              Updated:
              Imported:
              Indexed: