how would i add an icon to my save file?

right now, i can save a file using JFileChooser, but how would i added an icon to the file that i saved?

fileChooser.addChoosableFileFilter(new CLVFilter()); 
 int returnValue = fileChooser.showSaveDialog(frame); 

 if(returnValue == JFileChooser.APPROVE_OPTION){ 
    try{ 
         //filename consists of path 
         String filename = fileChooser.getSelectedFile().toString(); 
         FileWriter fstream = new开发者_StackOverflow FileWriter(filename); 
         BufferedWriter out = new BufferedWriter(fstream); 

         out.write(SingleIntersection.this.getContentsOfObject()); 
         out.close(); 

      }catch (Exception excep){//Catch exception if any 
          System.err.println("Error: " + excep.getMessage()); 
      } 
  }  

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An icon is something your operating system displays (as mentioned by Andy Thomas-Cramer). All you need to specify is the file extension while creating the file.

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The file icon is dependent on the file type. This association (type-icon) is done by the operating system (in windows it depends on the file name extension). You may change the association with java code, but not the icon of a specific file.

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If you are on OSX, you should also look at the Apple Java Extensions, specifically FileManager. Calling setFileType(int) may get you the desired results.

Unfortunately, I don't know of any non-JNI way to write to the Resource Fork.

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We have to set a icon file using windows registry.

eg : your extension .expr

then create icon file for this using registry.