How do I create and display a text file?

Question

Hello friends,
I am trying to create a simple unix like operating system with very basic functionality. I have a hard time trying to create a "mktext" file and actually display the contents of the text file with the "cat" command. For example:
// If I type
$$ mktext test.txt "We are one"
$$ Text file is created
// And if I type
$$ cat test.txt
// This line will appear
$$ "We are one" // Only the contents of the test.txt will display.
That is what I want to do, but currently stuck. I would appreciate any help and suggestions. Thanks...

Answer 1

This will do it:
import java.io.*;
import java.util.*;
public class Osys
     BufferedReader keyboard = new BufferedReader(new InputStreamReader(System.in));
public Osys()
     try
          while(true)
               System.out.print("$$ ");
               String s = keyboard.readLine();
               analize(s);
     catch(Exception e){}
private void analize(String s)
     if (s.trim().equals("")) return;
     StringTokenizer st = new StringTokenizer(s," ");
     if (!st.hasMoreTokens()) return;
     String s1 = st.nextToken();
     if (s1.equals("cat"))
          if (st.hasMoreTokens()) readIt(st.nextToken().trim());
          System.out.println("");  
          return;
     if (s1.equals("mktext"))
          if (st.hasMoreTokens()) writeIt(st.nextToken().trim(),s);
          System.out.println("");
          return;
// write
private void writeIt(String file, String line)
     BufferedWriter writer;
     StringTokenizer st = new StringTokenizer(line,"\"");
     if (st.countTokens() != 2) return;
     st.nextToken();
     try
          writer  = new BufferedWriter(new FileWriter(file));
             writer.write(st.nextToken()); 
          writer.close();
          System.out.println("$$ Text file is created");  
     catch (IOException e)
           System.out.println(""+e);  
// read
private void readIt(String file)
     BufferedReader reader = null;
     String         read   = null;
     try
         reader = new BufferedReader(new FileReader(file));
          while( (read = reader.readLine()) != null)
              System.out.println("$$ "+read);  
          reader.close();
     catch (IOException e)
           System.out.println(""+e);  
public static void main(String[] args)
     new Osys();
}Noah