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Thread: Can I have two scanners to the same file? (I want to read through one file 2 times)

  1. #1
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    Default Can I have two scanners to the same file? (I want to read through one file 2 times)

    So what I need to do in this program is go through a file and check for symbols/labels, then im storing those labels in an array for later access. then go through again and convert the instructions.

    now after i go through the file once, i want to go through it again, starting from the top, but im not sure how this is done.

    i tried this:

    		Scanner sc = new Scanner(new File("asm.asm"));
    		Scanner sc2 = new Scanner(new File("asm.asm"));


    Assuming that each one would point to the beginning of the file, so i could go through using sc then when im done go through and use sc2 which would still be at the beginning of the file since its a different scanner.

    but i get an error when it gets to the 2nd scanner:

    	 while(sc2.hasNextLine())
    		  {
    		   //error happens on this line, no such element exception	
                       input = sc.nextLine();
                      }


    So i'm wondering am I going about this the wrong way or am I just not executing my idea properly? If there is an easier way to do this please let me know (like maybe there is a command to reset the scanner to the beginning of the file that i dont know about). Thank you for the help.


  2. #2
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    Default Re: Can I have two scanners to the same file? (I want to read through one file 2 time

    wow just found it, i used sc when i was reading in the input. always seems like i figure it out once i ask for help.

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    Default Re: Can I have two scanners to the same file? (I want to read through one file 2 time

    Sometimes all you need to do is lay out your logic Mark the thread as solved please.

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