Thread: Dont understand objects used with FileInputStream and FileOutputStream constructor

In the code below, both fin and fout variables are set to null. Why is this. In the second and third "try block" fin and fout are compared to "null". Why is this? Please help me with my question.

Thanks,
Truck35

 // Copy a File.
    try {
      // Attempt to open the files.
      fin = new FileInputStream(args[0]);
      fout = new FileOutputStream(args[1]);
 
      do {
        i = fin.read();
        if(i != -1) fout.write(i);
      } while(i != -1);
 
    } catch(IOException exc) {
      System.out.println("I/O Error: " + exc);
    } finally {
      try {
        fin != null) fin.close();    //code in question
      } catch(IOException exc) {
        System.out.println("Error Closing Input File");
      }
      try {
         if(fout != null) fout.close();   //code in question
        } catch(IOException exc) {
        System.out.println("Error Closing Output File");
      }
    }
  }
}