IO_ellisms_worksheet







Lab: Experimenting with Input/Output



3.3. What was the first error generated by the compiler?
Rooter.java:24: cannot find symbol
symbol  : class PrintWriter
location: class Rooter
       PrintWriter     screen;  


3.4. What line did you need to add?
import java.io.*;


3.6. What was the first error generated by the compiler this time?
cannot find symbol
symbol  : class Scanner
location: class Rooter
       Scanner         keyboard;



3.7.  Fix this error.  What line did you need to add?
import java.util.Scanner;


4.4. Why was no output generated?
The data was stuck in the buffer, and needed to be flushed out.


4.5. Fix this mistake.  What line did you add?
screen.flush();


4.6. What do you need to type in the terminal window (as a response to
the prompt) in order to make this application terminate normally?

ctrl-z, or throw it an exception in the form of an input mismatch exception

5.4. What output was generated?
          
Today's Date: 22 January 2007
        Birthday: Sir Francis Bacon
        Birthday: George Foreman


5.6. What happened and why?
It came up with an error because the output did not exist


5.8 What changes did you need to make?
added the line  
File                     dates;
          

5.10. What changes did you need to make?
added
if (args.length>=1)
	dates=new File(args[0]);
to test to see if an argument was passed, and declere that argument as dates
if it exists



5.12. What changes did you need to make?
added
dateScanner=new Scanner(dates);
processDates(today);
under where i declared the args, so it would set the args as the Scanner
and then run them through the processDates method
          
5.14. What output was generated?
Today's Date: 22 January 2007
        Birthday: Sir Francis Bacon
        Birthday: George Foreman
          

6.2. What changes did you need to make?
I needed to add a loop to run for as many arguments as there are and declare
each one separately

it looked like this
		if (args.length>=1)
		 {
		 	for(counter=0; counter<args.length; counter++)
			{
		 	  dates=new File(args[counter]);
			  dateScanner=new Scanner(dates);
			  processDates(today);
			}
			
		 }
		else
		{
		  dateScanner = new Scanner(System.in);
        	  processDates(today);
		}


          
6.4. What output was generated?
Today's Date: 22 January 2007
        Birthday: Sir Francis Bacon
        Birthday: George Foreman
        Programming Assignment 1 Due
        Review the Java tutorial on Exceptions