Command line argument help...

I need help with specifying multilple file names on the command line to proccess passages in each of them in order All in one run... Each passage(file) has to be processed separately with the output for the different tasked independent of the other passages.. Meaning, process the first passage and produce the required output, then process the second passage and so on..


For example, the two files that i wanna read in on the command line is called p2p.txt and google.txt

How i would read in only one is something like: java project p2p.txt

How do i process both?

Code:

---

      // Check for existence of the file

      File infile = new File(args[0]);


      if(!infile.exists())
      {

        System.out.println("The file" +args[0]+ "does not exists.");
        System.out.println("Quitting now. Please try again.");
        System.exit(1);
      }

---

Also, how do lose the precision on something like:

Code:

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(prepositions_count[i]/(double)num_words)*100);

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or

Code:

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(biagrams_count[i]/(double)num_biagrams)*100);

---

Where something like 5.400981996726677 becomes 5.4?

java project p2p.txt google.txt

Code:

---

File infile1 = new File(args[0]);
File infile2 = new File(args[1]);

---

For number formatting look at DecimalFormat.

And it's better to validate them in a loop, hence easily you can capture all the arguments passing in.

Quote:

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Originally Posted by PhHein

java project p2p.txt google.txt

Code:

---

File infile1 = new File(args[0]);
File infile2 = new File(args[1]);

---

For number formatting look at DecimalFormat.

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That doesn't work..... Maybe if i give an example to my whole code, it'll be more clear with what i'm talking about:

Code:

---

import java.util.*;
import java.io.*;

public class StringProccessing
{
  public static void main(String[] args)
  throws java.io.IOException
  {

  // Declare Variables

      int i;
      int j= 0;
      int num_lines = 0;
      int num_words=0;
      String infilename;
      String str [] = new String [1000];
      String [] words = new String [10000];
      String longest_word = "";

   
      // Command line argument

      File infile = new File(args[0]);


      if(!infile.exists())
      {

        System.out.println("The file" +args[0]+ "does not exists.");
        System.out.println("Quitting now. Please try again.");
        System.exit(1);
      }


    //Open the file for reading

    Scanner fsc = new Scanner(infile);


    //Read the data in the file line by line
    System.out.println("\nPrint the passage:");
    System.out.println("-----------------");
    while (fsc.hasNext() )
    {
        str[num_lines]= fsc.nextLine();
        System.out.println(str[num_lines]);
        num_lines ++;
    }

    // Capitalize first character of each word and  Count the total number of words in passage
    System.out.println("\nCapitalize first character of each word and  Count the total number of words in passage:");
    System.out.println("----------------------------------------------------------------------------------------");
    for(i=0; i<num_lines; i++)
    {
        Scanner wordScanner = new Scanner(str[i]);
        while (wordScanner.hasNext() )
        {
            words[num_words]= wordScanner.next();
            Character.toUpperCase(words[num_words].charAt(0));
            System.out.print(Character.toUpperCase(words[num_words].charAt(0)) + words[num_words].substring(1) + " ");
            num_words ++;
        }
        System.out.println();
    }

      System.out.println("\nThe number of words in the passage: " +  num_words);

      int word_length=0;
      int longest=0;

      for(i=0; i<num_words; i++)
      {
          if(words[i].trim().endsWith("s"))
              word_length = words[i].trim().length() -1;
          else
              word_length = words[i].trim().length();

          if(word_length > longest)
          {
              longest = word_length;
              longest_word = words[i].trim();
          }
      }

      System.out.println("\nThe longest word in the passage: " + longest_word);
      System.out.println("The length of the longest word: " + longest);


    // Change all occurrences of the word "The" to the word "La" and the word "the" to the word "la"
    System.out.println("\nChange all occurrences of the word The to the word La and the word the to the word la:");
    System.out.println("-------------------------------------------------------------------------------------");
    for(i=0; i<num_lines; i++)
    {
        Scanner wordScanner = new Scanner(str[i]);
        while (wordScanner.hasNext() )
        {
            String word = wordScanner.next();
            if(word.equals("The"))
                word = "La";
            if(word.equals("the"))
                word = "la";
            System.out.print(word + " ");
        }
        System.out.println();
    }


      //Print frequency table for prepositions "of,""to,""in,""for,""whith,"" and "one."
      String prepositions [] = {"of", "to", "in", "for", "With", "on"};
      int prepositions_count[] = new int[6];
      int num_prepositions=0;
      for(i=0; i<num_words; i++)
      {
          for(j=0; j<prepositions.length; j++)
          {
              if(words[i].equalsIgnoreCase(prepositions[j]))
              {
                  prepositions_count[j]++;
                  num_prepositions++;
              }
          }

      }

      System.out.println("\nPreposition| Frequency | % ");
      System.out.println("----------------------------");
      for(i=0; i<prepositions.length; i++)
      {
          System.out.println(prepositions[i] + " | " + prepositions_count[i] + " | " + (prepositions_count[i]/(double)num_words)*100);
      }
      System.out.println("----------------------------");
      System.out.println("Total | " + num_prepositions + " | " + (num_prepositions/(double)num_words)*100);

  }

}

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Now When i enter java p2p.txt goolge.txt, it would print out the statements in my code, in the same order for both files and so forth... With the above code that you suggested, it still only gives me the information for p2p.txt.

You're going to need to do some refactoring, which frankly you should have done before now anyway.

Quote:

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Originally Posted by arson09

Code:

---

import java.util.*;
import java.io.*;

public class StringProccessing
{
  public static void main(String[] args)
  throws java.io.IOException
  {
        ...
      // Command line arguments
      for (String arg : args) {
            File infile = new File(arg);
            if (!infile.exists) {
                System.err.println("File '" + arg + "' does not exist.");
                System.err.println("Continuing with next file.");
                continue;
            }
            processFile(infile);
      }
  }

  public static void processFile(File infile) {
    //Open the file for reading

    Scanner fsc = new Scanner(infile);


    //Read the data in the file line by line
    System.out.println("\nPrint the passage:");
      ...
  }

}

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Your processFile() method should itself be decomposed into several more methods. Good luck!

-Gary-