How do you get a program to read an input file?

I have a problem where i need my program to read an input file and the name of the input file should be read as a command line argument. How in the world do I do this?? I do not have the slightest idea how to get that done? Please help!!

The command line arguments are stored in the String[] args passed in from the main function.
To use the argument as a file name, you can create a FileInputStream. To make it easier to read, you can then put the FileInputStream into a BufferedReader to read line by line. For example:
public static void main(String[] args) {
   FileInputStream fileIn;
   BufferedReader reader;
   try {
      fileIn = new FileInputStream(args[0]);
   catch (FileNotFoundException fnfe) {
      System.err.println("could not find file " + args[0]);
   reader = new BufferedReader(fileIn);   You may now use reader.readLine() to read each line from the file. I hope this helps!
-JBoeing

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