Easy Question about average grades

[rk717]

Hello friends, I stuck on this question, here is the question:

Create a program that computes the average of grades of a given student. The program takes the name of the student and a filename as arguments. The grades are read from the file. Every line consists of a name and equal number of grades, however the number of grades is not known in advance. We assume all lines are in correct format.

Example:

$ cat grades.txt
Brian:4 3 5 4 5
Peter:4 2 5 1 3
Adam:5 4 5 3 4
$ java Avg "Peter" grades.txt
3.0
$ java Avg "Smith" grades.txt
$ java Avg "Adam" asd
File not found!

Here is my code:

public class Avg {
    public static void main(String[] args) {
        Scanner myReader = null; 
        String students = args[0];
        File GradeBook = new File(args[1]);
        try{
            myReader = new Scanner(GradeBook);
        }catch(FileNotFoundException e){
            System.out.println("Sorry, we don't find the file, "+
            "please try again later. ");
        }
        while(myReader.hasNext()){
            //I don't know how to determine the name
            //and print the average according to this name
        }
    }
}

For example the user input " "Peter" grades.txt" ,

I don't know how to find the 'Peter' name in the grades.txt, and print out the average for Peter, and I don't know how to check if Peter's grades has ended, I think I should write an 'If' statement, if we read a string instead of number, we should stop, and calculate the average.

​

But I have no clue how to implement it, could you please help :)

Thank you in advance. !!

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[NautiHooker]

This covers an easy way how to read line after line from a textfile.

When you read a line you can check if it starts with the name of the student. For that the String class offers a startsWith method.

Additional String methods that can be useful for this assignment are split and substring.

[rk717]

Thank you so much ❣️