pdf - How do I use different prefixes when renaming multiple files in Java? -


I'm trying to create a Java app (with swing) which designates PDF files with a set naming convention is. Currently files are named: 

  1.pdf, 2.pdf ...... 10.pdf, 11.pdf ...... 20.pdf, 21.pdf etc. .   
 So I decide to add a prefix  (ABC_0)  to the filename. The new file name should be:  
  abc_01.pdf, abc_02.pdf .... abc_10.pdf, abc_11.pdf ...... abc_20 pdf, abc191 pdf etc.   
 So far everything is working fine. The problem is facing only that when a prefix is ​​added to a PDF file name with a number 10 and above, The name changes:  
  ABC_010.pdf, ABC_011.pdf .... .. ABC_020.pdf, ABC_021.pdf etc.   
 This is incorrect  0  should be paired with only 1 number in the PDF file names.  
 Can you help me?  
 This is the code with which I need help.  
  {string dir = ttttsrc gttext (); String addPrefix = "ABC_0"; File directory, errorfile 1; File old file, new file; String newname; String filename []; Int i, count; DirFile = New File (DIR); If (Dirfile.exists () ||! DirFile.isDirectory ()) {Message ("File does not exist or does not have directory"); } File name = dirFile.list (); For (i = count = 0; i    
 
 
 You can make sure that your filenames are null:  
  public string pad (string filename, int lane) {if (fileName.length ()> gt0 = len) {return fileName;} string pad = "0000000" + fileName; // Change the number of zeros for your needs padded.substring (padded.length () - len);}   
 Then you have to do "ABC_" for the padded value first:  
  string newName = "A BC_ "+ Pad (old Newamam, 6); // output 6 characters per string   
 generates such results:  
  10.pdf gets ABC_10 .pdf 1.pdf gets ABC_01.pdf a.pdf becomes ABCGAPDF 100 PDF to ABBCIDADPDF AA ABC_ATHEAA

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