String Parsing Problem

[jamess]

I have the following data:

Maths abc10 4 def08 6 ;  
English hrd45 3 ngh05 10 ; .

The word at the beginning is a keyword which is also in an enum, the following data are username and login pairs (there can be an unlimited number of these. The data for each keyword is terminated by ';' and the data is terminated by '.'

I'm using the scanner class but I can't get it to loop so that I can store it in a class to be used for statistical analysis - the output should be like below -

Maths abc10 4   
Maths def08 6   
English hrd45 3  
English ngh05 10

Any Ideas? Thanks!

[Fubarable]

Let's see your code attempt and what it's outputting.

... and welcome to the Java-forums.org.

[jamess]

Here's the code

import java.util.Scanner;

public class Statistics {
	
	public enum Courses {Programming, Logic, Hardware, DiscreteMathematics, MathematicalMethods, ComputerSystems, Graphics};

	public static void main(String[] args) {
		Statistics stats = new Statistics();
		stats.parseInput();
	}
	
	private void parseInput(){
		Course cs = new Course(); 
		Scanner sc = new Scanner(System.in);
		String token;
		int index = 0;
		while (sc.hasNext()) {
			token = sc.next();
			if (isCourseToken(token)) {
				Courses coursename = Courses.valueOf(token);
				cs.coursename = coursename;
			} else {
				if (isInteger(token)) {
					int mark = toInteger(token);
					cs.marks[index] = mark;
					cs.grades[index] = toGrade(mark);
				} else {
					cs.students[index] = token;
				}
			}
			index++;
		}
	}
	
	private boolean isCourseToken(String token) {
		try {
			Courses.valueOf(token);
		} catch (IllegalArgumentException exc) {
			return false;
		}
		return true;
	}
	
	private boolean isInteger(String token) {
		try {
			Integer.parseInt(token);
		} catch (NumberFormatException exc) {
			return false;
		}
		return true;
	}
	
	private int toInteger(String token) {
		return Integer.parseInt(token);
	}
	
	private char toGrade(int mark) {
		String grades = "FFFEDCBAA++";
		return grades.charAt(mark);
	}
}

class StudentData {
	String login;
	int mark;
}

class Course {
	Statistics.Courses coursename;
	String[] students;
	int[] marks;
	char[] grades; 
}

class Data {
	int mark;
	String login;
	String coursecode;
	StudentData studentrecord = new StudentData();
	StudentData[] studentrecords;
}

It's not really outputting anything yet as I have only attempted the parsing bit so far. Thanks!

[Vinod Mukundan]

I have the following data:

Maths abc10 4 def08 6 ;  
English hrd45 3 ngh05 10 ; .

Maths abc10 4   
Maths def08 6   
English hrd45 3  
English ngh05 10

Any Ideas? Thanks!

Well I could not understand your requirement fully .... Just see if the below approach is of any help ..

  Scanner sc = new Scanner(System.in);
        String token;
        ArrayList<String> list = new ArrayList<String>();
        StringBuilder  sb = new StringBuilder();
      
        while (!(token = sc.next()).equals(".")) {     
            if(!token.equals(";")) {
                      sb.append(token+",");
            }else{
               list.add(sb.toString());
                sb = new StringBuilder();
            }
        }

        for(String t : list){
            System.out.println(t);
            String[] det = t.split(",");
            int i=3;
            while(i<=det.length){
                System.out.print(det[0]+" ");
                System.out.print(det[i-2]+" ");
                System.out.println(det[i-1]);
                i=i+2;
            }
        }

ofcourse the code is not optimized ...... :p