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Thread: How to use Array

  1. #1
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    Default How to use Array

    Hi, having trouble with this code. Can't figure out how to tell the code to keep printing firstname lastname and etc.. based on what number of students the user enters and how to keep storing it.



    package studentscoresapp;
     
    import java.util.ArrayList;
    import java.util.Scanner;
     
    public class StudentScoresapp {
     
     
        public static void main(String[] args) {
     
            // display a welcome message
            System.out.println("Welcome to the Future Value Calculator");
            System.out.println();
     
            // perform 1 or more calculations
            Scanner sc = new Scanner(System.in);
            String choice = "y";
            while (choice.equalsIgnoreCase("y")){
     
     
               System.out.println("Welcome to The Student Scores Application.");
     
               System.out.println("Enter number of students to score:  ");
               int numbofStudents = sc.nextInt();
     
     
     
               System.out.println("Student lastname:  ");
               String lastName = sc.nextLine();
     
               System.out.println("Student firstname:  ");
               String firstName = sc.nextLine();
     
               System.out.println("Student Score:  ");
               String studentScore = sc.nextLine();
     
     
     
     
            ArrayList<String> students = new ArrayList<>();
     
            //add number of strings
            students.add(lastName);
            students.add(firstName);
            students.add(studentScore);
     
            //print the array list
            for (int i = 0; i < students.size(); i++){
     
     
            String student = students.get(i);
            System.out.println(student);
     
     
     
            }
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
                // see if the user wants to continue
                System.out.print("Continue? (y/n): ");
                choice = sc.next();
                System.out.println();
     
     
     
     
            }
     
     
     
        }
    }


  2. #2
    Super Moderator jps's Avatar
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    Default Re: How to use Array

    Where is the loop that is supposed to print each item?

  3. #3
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    Default Re: How to use Array

    Quote Originally Posted by jps View Post
    Where is the loop that is supposed to print each item?

    I'm sorry jps, I'm a little confused, do you mean where's the loop that will print each entry each time it's entered?

    I was under the impression from the instruction I was given for the assignment that when the user enters the number of students he wants to enter, lets say 4, somehow it's suppose to output the "enter first name, lastname" , to the user the amount of times he specified in the(so for the example 4 times), "enter number of students". Once that's done, it was suppose to output all the names, in that sequence. I'm stuck on not even understanding how to use the integer the user provides as the size of the array and how to output, "enter firstname" and etc the specified number of times automatically after. Even after that, I'm not sure how to get the array to store multiple strings of the same name (lastname, or firstname).

  4. #4
    Super Moderator jps's Avatar
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    Default Re: How to use Array

    I'm a little confused, do you mean where's the loop that will print each entry each time it's entered?
    I was just trying to answer the question you didn't really ask. Don't take my word for it, go by the instructions.
    Start out trying to read a number from the user and print it out. Then read a number from the user and use it in math, and print it out. Then work on using the number to control the loop. Build the program up in smaller steps.

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