Aaron Best

Yeah, sorry about that everyone. I had a few problems that had to be dealt with. As far as the code goes, I've revised it. As far as Maps and Lists go, I'm afraid that's beyond my level of skill.. I had a little help from a friend, who told me to make strings for each range and my code came out like this:

import java.io.*; import java.util.*; class NewGrades { public static void main(String[] args) throws IOException { String firstName = null, lastName = null, gradeString = null, filename; String strLine; // Initializing new Strings for each range String firstRange = "", secondRange = "", thirdRange = "", fourthRange = "", noData = ""; int grade = 0, linesWithGrades = 0; double avg = 0; filename = "GPA.txt"; StringTokenizer st; BufferedReader br; try { br = new BufferedReader(new FileReader(filename)); // Required to read the file while ((strLine = br.readLine()) != null) { st = new StringTokenizer(strLine, " "); try { while (st.hasMoreTokens()) { firstName = st.nextToken(); lastName = st.nextToken(); gradeString = st.nextToken(); grade = Integer.parseInt(gradeString); if (grade > 0 && grade < 69) { avg += grade; linesWithGrades++; firstRange += lastName + " " + firstName + "\t" + grade + "\n"; } else if (grade > 69 && grade < 80) { avg += grade; linesWithGrades++; secondRange += lastName + " " + firstName + "\t" + grade + "\n"; } else if (grade > 79 && grade < 90) { avg += grade; linesWithGrades++; thirdRange += lastName + " " + firstName + "\t" + grade + "\n"; } else if (grade > 89 && grade < 101) { avg += grade; linesWithGrades++; fourthRange += lastName + " " + firstName + "\t" + grade + "\n"; } // To avoid adding the wrong data to noData, the variables are cleaned firstName = ""; lastName = ""; gradeString = ""; } } catch (Exception e) { // Catches null data for noData noData += lastName + " " + firstName + "\t" + gradeString + "\n"; } } } catch (Exception e) { System.out.println("Exception while reading GPA file: " + e); } System.out.println("Students with grades 69 and below: "); System.out.println(firstRange); System.out.println("Students with grades between 70 and 79: "); System.out.println(secondRange); System.out.println("Students with grades between 80 and 89: "); System.out.println(thirdRange); System.out.println("Students with grades of 90 and above: "); System.out.println(fourthRange); System.out.println("Persons with no grade or incomplete data: "); System.out.println(noData); System.out.println(); System.out.println(); System.out.print("The grade point average is" + "\t" + Math.ceil(avg / linesWithGrades)); System.out.println(); } }

Now, there's one last problem. A new addition to this assignment is, if I understood it right, to output the data I get from running the program to a new file, like "GPA2.txt". I believe my professor wants me to use PrintWriter, but I'm not entire sure I understand how it works. I know the constructor for it:

public PrintWriter(Writer out, boolean autoFlush)
But I don't understand how the parameters work here. Once I figure this out, get in my code, and print my output to a new file, I'll be officially done. So I must again ask for your assistance here, everyone. ^_^;

Hello, JavaRanch. My name's Aaron, and as this thread's title states, a newbie to the Java world. I understand a little about Java after 9 weeks of classes/labs, even more since I have a few friends who can help. I'm here today to ask for assistance regarding a code I'm working on now. The situation is, I need to read data from an external text file (which I've already completed), break the contents into tokens with StringTokenizer (also completed), then output the data in the format:

Students with grades of X between Y:
LastName FirstName Grade
LastName FirstName Grade
... and so on

I need to do this for the following ranges; 69 and below, 70 to 79, 80 to 89, and 90 to 100 (I've also done this). But the problem is, the output is all screwed up. Here's the code:

import java.io.*; import java.util.*; class NewGrades { public static void main(String[] args) throws IOException { String firstName = null, lastName = null, filename; String gradeChecker = null, strLine; int grade = 0, linesWithGrades = 0; double avg = 0; filename = "GPA.txt"; StringTokenizer st; BufferedReader br; br = new BufferedReader(new FileReader(filename)); while ((strLine = br.readLine()) != null) { st = new StringTokenizer(strLine, " "); try { while (st.hasMoreTokens()) { firstName = st.nextToken(); lastName = st.nextToken(); gradeChecker = st.nextToken(); if (firstName == null || lastName == null || gradeChecker == null) { } else { grade = Integer.parseInt(gradeChecker); if (grade < 69) { avg += grade; linesWithGrades++; System.out.println("Students with grades 69 and below: "); System.out.println(lastName + " " + firstName + "\t" + grade); } else if (grade > 69 && grade < 80) { avg += grade; linesWithGrades++; System.out.println("Students with grades between 70 and 79: "); System.out.println(lastName + " " + firstName + "\t" + grade); } else if (grade > 79 && grade < 90) { avg += grade; linesWithGrades++; System.out.println("Students with grades between 80 and 89: "); System.out.println(lastName + " " + firstName + "\t" + grade); } else if (grade > 89 && grade < 101) { avg += grade; linesWithGrades++; System.out.println("Students with grades of 90 and above: "); System.out.println(lastName + " " + firstName + "\t" + grade); } else if (gradeChecker == null) { System.out.println("Persons with no grade or incomplete data: "); System.out.println(lastName + firstName); } } } } catch (Exception e) { System.out.println("Exception while reading GPA file: " + e); } } System.out.println(); System.out.println(); System.out.print("The grade point average is" + "\t" + Math.ceil(avg / linesWithGrades)); System.out.println(); } }
The output turns out like this:

----jGRASP exec: java NewGrades Students with grades between 80 and 89: Clinton Bill 85 Students with grades of 90 and above: Gore Al 100 Students with grades of 90 and above: Bush George 95 Students with grades between 80 and 89: Clinton Hillery 83 Students with grades between 70 and 79: McCain John 72 Students with grades between 80 and 89: Green Danna 87 Students with grades between 70 and 79: Delaney Steve 76 Exception while reading GPA file: java.util.NoSuchElementException Students with grades 69 and below: Bills Beth 60 Students with grades of 90 and above: Takei Rhea 94 Students with grades between 70 and 79: Uetake Ami 77 Students with grades of 90 and above: Ieyasu Aoi 100 Students with grades of 90 and above: Nishihara Eri 100 Students with grades of 90 and above: Fanelitz Amelia 100 Students with grades between 80 and 89: Rheyin Krystal 87 Exception while reading GPA file: java.util.NoSuchElementException Exception while reading GPA file: java.util.NoSuchElementException The grade point average is 87.0 ----jGRASP: operation complete.

See what I mean? What I'm trying to do is get it so each person is under the correct range without the range showing up so many times. I also need to output the names of people who don't have any grades available, but those turn out as Exceptions. Can anyone give me a hand here? Thanks in advance.