how to check whether the file exist?


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Thread: how to check whether the file exist?

  1. #1
    Join Date
    Jan 2004
    Posts
    3

    how to check whether the file exist?

    I am kokhwa.

    I had use Runtime.exec() to run a program. The program will generate a file.

    I need to read the file to generate another file.
    So i have to wait the program generate the file which i want.

    What method should i use to wait until the program generate the file i want?If the file had been generated,
    I will use it. If not, I have to wait it until the file had been generate.

    ...That is my problem!

    anybody know how to solve this problem?
    Thanks for your help!

  2. #2
    Join Date
    Feb 2004
    Posts
    808
    something like this:

    Code:
    java.io.File needed = new java.io.File("C:\myfile.txt");
    
    while( !needed.exists() ){
      Thread.sleep(2000); //sleep for 2 seconds.. MUST DO THIS
    }
    your code will go into the loop until the file exists, checking every 2 seconds

    note also there are many exceptions thrown that i have not try{}catch{}ed
    The 6th edict:
    "A thing of reference thing can hold either a null thing or a thing to any thing whose thing is assignment compatible with the thing of the thing" - ArchAngel, www.dictionary.com et al.
    JAR tutorial GridBag tutorial Inherited Shapes Inheritance? String.split(); FTP?

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