Storing multiple user inputs into multiple separate arrays

Question

I am EXTREMELY new to programming. I am trying to write a program that allows users to enter in their college / university transcripts course by course. I would like each course to be separated in their own array and separated by spaces.

For example: ENG 105 A 3 (array 1) MAT 102 A 4 (array 2) etc...

It seems as if the input is being stored into one single array.

It would be awesome if I did not have to use a counter and the program could move on when users are done entering their courses.

import java.util.Scanner;

public class Tester{

public static void main(String[] args) {

 int length;
 Scanner input = new Scanner(System.in);

 System.out.println("How many courses did you complete at your college / university?: ");
 length = input.nextInt();  

 String[] courses = new String[length];

 System.out.println("Follow this model when entering your courses: ENG 105 3 A");

 for(int counter = 0; counter < length; counter++){
  System.out.println("Course "+(counter+1));
  courses[counter] = input.next();   
 }

 input.close();

}

}

It seems like there are two issues here. 1. you would like three arrays. 2. you would like a better way to end user input. I'm not sure what the benefit of #1 is. Do you want String[] courses to be String[][] courses? To end user input you could have the user enter done and check for that string to exit the loop. — John Mercier
– John Mercier, Commented Apr 10, 2019 at 19:10
I was thinking I could create a student object and then have an arraylist inside of that object that holds the courses... And maybe when I implement a GUI I could have a “complete” button? — AddiFarmer
– AddiFarmer, Commented Apr 10, 2019 at 19:34
Other suggestion would be to use a list of object: List<Course> ... where Course is a class with 4 attributes (e.g.. ENG. 105, A and 3). — Jaja
– Jaja, Commented Apr 10, 2019 at 21:40

Jaja · Accepted Answer · 2019-04-10 21:34:31Z

1

There is 2 points to fix: Handle data (ENG-105-3-A) and buffer.

String[][] courses = new String[length][4];

System.out.println("Follow this model when entering your courses: ENG-105-3-A");

for(int counter = 0; counter < length; counter++){
    System.out.println("Course "+(counter+1));

    //Solution
    courses[counter] = input.next().split("-");  //data are separated by "-"

    input.nextLine(); //Cleanning buffer

}

answered Apr 10, 2019 at 21:34

Jaja

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2 Comments

AddiFarmer Over a year ago

This is working. I am trying to figure out how to print single courses. For example, the third course you entered is (print 3rd entered course here).

Jaja Over a year ago

@AddiFamer, try this to print courses: System.out.println("\nEntered Stuffs.!"); int nbr=0; for(String[] cours:courses){ System.out.println("Course "+nbr++); for(String s:cours) System.out.print(s+" "); System.out.println(); } (so lat but try it, if you are not jet got it)

Matias Fuentes · Accepted Answer · 2019-04-10 21:37:48Z

0

To achieve what you want something like this would work:

String[][] courses = new String[length][];

System.out.println("Follow this model when entering your courses: ENG 105 3 A");

for (int counter = 0; counter < length; counter++){
    System.out.println("Course "+(counter+1));
    courses[counter] = input.nextLine().split("\\s+");   
}

Since this is splitting the course, it generates an array of arrays, that looks like this:

[["ENG","105","A","3"], ["MAT", "102", "A", "4"]]

On the other hand, if you want to stop the input when the user enters a keyword, you need something like this:

List<String[]> courses = new ArrayList<String[]>;

System.out.println("Follow this model when entering your courses: ENG 105 3 A");
String course = input.next();
while (!course.equals("end")){
    courses.add(course.split("\\s+"));  
    String course = input.nextLine(); 
}

edited Apr 10, 2019 at 21:37

answered Apr 10, 2019 at 21:13

Matias Fuentes

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2 Comments

Jaja Over a year ago

After input.next(), buffer should be cleanned

AddiFarmer Over a year ago

To get this to work i needed to add the array size of 4 in the bracket next to length. I also had to add input.HasNextLine. Thank you! :)

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