Jason Mackie

right on...thanks

i actually used the StringTokenizer to solve the problem...I tried messing around with "split" for a long while and was not able to come to a solution. Here was my finishing code:

//**************************************************************************** //Warning.java //Reads student data from a text file and writes data to another text file. //**************************************************************************** import java.util.StringTokenizer; import java.io.*; import java.util.Scanner; public class Warning { // -------------------------------------------------------------------- // Reads student data (name, semester hours, quality points) from a // text file, computes the GPA, then writes data to another file // if the student is placed on academic warning. // -------------------------------------------------------------------- @SuppressWarnings("hiding") public static void main (String[] args) { Scanner inFile; PrintWriter outFile; String name, inputName = "students.txt"; String outputName = "warning.dat"; int creditHrs; // number of semester hours earned double qualityPts; // number of quality points earned double GPA; // grade point (quality point) average try { // Set up the input file stream inFile = new Scanner(new FileInputStream(inputName)); // Set up the output file stream outFile = new PrintWriter(new FileOutputStream(outputName)); // Print a header to the output file outFile.println (); outFile.println ("Students on Academic Warning"); outFile.println (); // Process the input file, one line at a time while(inFile.hasNextLine()) { String information = inFile.nextLine(); // Get the credit hours and quality points and // determine if the student is on warning. If so, // write the student data to the output file. StringTokenizer info = new StringTokenizer(information); name = info.nextToken(); creditHrs = Integer.parseInt(info.nextToken()); qualityPts = Double.parseDouble(info.nextToken()); GPA = qualityPts / creditHrs; if (GPA < 1.5 && creditHrs < 30) { outFile.println(name + " " + creditHrs + " " + GPA); } else if (GPA < 1.75 && creditHrs < 60) { outFile.println(name + " " + creditHrs + " " + GPA); } else if (GPA < 2.0) { outFile.println(name + " " + creditHrs + " " + GPA); } } // Close both file streams inFile.close(); outFile.close(); } catch (FileNotFoundException exception) { System.out.println ("The file " + inputName + " was not found."); } catch (IOException exception) { System.out.println (exception); } finally { System.out.println("File has been created"); System.exit(0); } } }

thanks to everyone that helped...
Jason

sorry here is the code i just posted might be easier to read this way

if (______ == string or char) { name == _________; } else if (_______ == int) { creditHrs = _____________; } else if (_______ == double) { qualityPts = ___________; }

it seems to me that the whole "split" thing would work but how would i be able to store them in differnt variables?

in the file im inputing there are 3 "variables" per line. the first one is name which has no spaces, the second is an integer that is called creditHrs, and the last is a double called qualityPts. I was thinking of using an if statement like

if (______ == string or char){
name == _________;
}
else if (_______ == int){
creditHrs = _____________;
}
else if (_______ == double){
qualityPts = ___________;
}

is there any way to do that?

if i have to input 5 separate lines of code like:

Smith 27 83.7
Jones 21 28.35
Walker 96 182.4
Doe 60 150
Wood 100 400

how would i be able to put smith, 27, and 83.7 in separate variables?

here is my code so far...

import java.util.StringTokenizer; import java.io.*; import java.util.*; public class Warning { // -------------------------------------------------------------------- // Reads student data (name, semester hours, quality points) from a // text file, computes the GPA, then writes data to another file // if the student is placed on academic warning. // -------------------------------------------------------------------- public static void main (String[] args) { Scanner inFile; PrintWriter outFile; String name, inputName = "students.dat"; String outputName = "warning.dat"; int creditHrs; // number of semester hours earned double qualityPts; // number of quality points earned double GPA; // grade point (quality point) average try { // Set up the input file stream inFile = new Scanner(new FileInputStream(inputName)); // Set up the output file stream outFile = new PrintWriter(new FileOutputStream(outputName)); // Print a header to the output file outFile.println (); outFile.println ("Students on Academic Warning"); outFile.println (); // Process the input file, one line at a time while (inFile.hasNextLine()){ String line = inFile.next(); // Get the credit hours and quality points and // determine if the student is on warning. If so, // write the student data to the output file.

there is more at the bottom but that is not important! I just need some guidance as to how to read a line of code from a file and then put the 3 different variables in their corresponding variables (im looking for help with the last comment in the snippet of code)

yes I can. That was not specified in the assignment. But I figured it out...gosh it took me forever. Thanks to everyone that helped me. Here is the snipit of code i needed to get it to work. I ran this code 3 separate times with slightly different variables for the three separate lines that i was inputing.

/* * for loop used to remove all the extra white spaces * in the firstLine string. It prints the output * to the file "Lab6Output" character by character * skipping extra whitespaces. */ for (int i = 0; i < firstLine.length(); i++){ if (firstLine.charAt(i) != ' '){ outputStream.print(firstLine.charAt(i)); whiteSpace = 0; } else if ((firstLine.charAt(i) == ' ') && whiteSpace == 0){ ++whiteSpace; outputStream.print(" "); if (firstLine.charAt(i+1) == ' '){ i++; } } }

thanks again guys...this site is a big help...now should i delete this whole post thing since i no longer need help?

ok so here is the code that I have and i put a comment block in where I think the remove whitespace code goes

import java.io.*; import java.util.*; public class FileIO { public static void main (String[] args){ Scanner inputStream = null; try{ inputStream = new Scanner (new FileInputStream ("Lab6Input.txt")); } catch (FileNotFoundException e){ System.out.println("There is no file with that name"); System.exit(0); } String firstLine = inputStream.nextLine(); String secondLine = inputStream.nextLine(); String thirdLine = inputStream.nextLine(); //**************************************** //CODE FOR GETTING RID OF EXTRA WHITESPACE //**************************************** PrintWriter outputStream = null; try{ outputStream = new PrintWriter(new FileOutputStream("Lab6Output.txt")); } catch (FileNotFoundException e){ System.out.println("There is no file with that name"); System.exit(0); } outputStream.println(firstLine); outputStream.println(secondLine); outputStream.print(thirdLine); outputStream.close(); System.out.println(firstLine); System.out.println(secondLine); System.out.println(thirdLine); } }

here is the input and output and how it should look

input Now is the time for all good people to come to the aid of their computers. output Now is the time for all good people to come to the aid of their computers.

ok sorry to Ernest...

and to Pete,

I have no idea how to do that whole ubb thing. I am using Eclipse and i didnt see anything that said ubb in edit.

the extra whitespaces in my input code are missing but they dont matter. they can be anywhere. I just cant figure out how to get rid of more than one between each word. It should read just like in the output. I tried using the "trim()" method but that had no effect. I think i need to read the words by themselves and then call "trim" but i cant figure out how to do this. Im new to this stuff and its kicking my rear I also looked in my book for string commands and trim was the only promising one in there that i noticed.

thanks for your help...i hope this will further help you help me! lol thanks again

So i have to import a file using a fileInputStream and then take out all the extra white spaces and then output the file into a different file obviously using a fileOutputStream. For the life of me I cant figure out how to remove the extra white spaces. Here is my code and all that good stuff so far:

Code:

import java.io.*;
import java.util.*;
public class FileIO {
public static void main (String[] args){
Scanner inputStream = null;

try{
inputStream = new Scanner (new FileInputStream ("Lab6Input.txt"));
}

catch (FileNotFoundException e){
System.out.println("There is no file with that name");
System.exit(0);
}

String firstLine = inputStream.nextLine();
inputStream.useDelimiter(" ");
String secondLine = inputStream.nextLine();
inputStream.useDelimiter(" ");
String thirdLine = inputStream.nextLine();
inputStream.useDelimiter(" ");
String array[];

System.out.println(firstLine);
System.out.println(secondLine);
System.out.println(thirdLine);

}
}

The input file:

Now is the time for all
good people to come to the
aid of their computers.

What the output file should look like:

Now is the time for all
good people to come to the
aid of their computers.


THANKS FOR YOUR HELP!!!

the exact error i get is "Unreachable catch block for DivisionByZeroException. This exception is never thrown from the try statement body". I am wondering if it has anything to do with the warning i get in my division by zero exception class...it says "The serializable class DivisionByZeroException does not declare a static final serialVersionUID field of type long"

I am also trying to declare my own exception called DivisionByZeroException. Therefore I have a class called DivisionByZeroException and in my Ratio class I added another catch statement to my try block and I am getting an error saying that my division by zero exception catch block cannot be reached. here is the code once for my exception class...


public class DivisionByZeroException extends Exception{

public DivisionByZeroException(){
super ("DivisionByZero error!");
}

public DivisionByZeroException(String message){
super(message);
}
}

____________________________________________________________________________
here is the code for my ratio class...

import java.util.*;
public class Ratio {
Scanner scan = new Scanner (System.in);
int n1, n2;
double r1;
boolean done;

public void ReturnRatio(){
do
{
done = true;
try
{
System.out.print("Please enter the first integer: ");
n1 = scan.nextInt();
System.out.print("Please enter the second integer: ");
n2 = scan.nextInt();
r1 = (double) n1 / n2;
System.out.print(r);
}

catch (InputMismatchException e)
{
scan.nextLine();
System.out.println("Please enter an Integer");
System.out.println();
done = false;
}

catch (DivisionByZeroException e)
{
scan.nextLine();
System.out.println("Please do not divide by zero");
System.out.println();
done = false;
}
}
while (!done);
}

}

ok so I tried that and it wasnt working last night so thats why I asked the "stupid" question lol...but i realized i forgot the public static void main (String[] args) statement...thanks for your help guys

what would the syntax be tho? i have 2 classes...1 called ratio which holds the code above, and the other is called ratioTester which holds the public static void method...what would i put in ratioTester?

Ok so basically i have to call the returnRatio method in my main class...and I have no idea how to call it because im not creating an object and then calling the method on the object. here is my code of the method...
import java.util.*; public class Ratio { Scanner scan = new Scanner (System.in); int n1, n2; double r1; boolean done; public void ReturnRatio(){ do { done = true; try { System.out.print("Please enter the first integer: "); n1 = scan.nextInt(); System.out.print("Please enter the second integer: "); n2 = scan.nextInt(); r1 = (double) n1 / n2; System.out.print(r); } catch (InputMismatchException e) { scan.nextLine(); System.out.println("Please enter an Integer"); System.out.println(); done = false; } continue; } while (!done); } }

EDIT by mw: Added Code Tags to original poster's indentation.

[ February 11, 2007: Message edited by: marc weber ]
[ February 11, 2007: Message edited by: Bear Bibeault ]

awesome thanks marc that worked...