How would I add a object to a arraylist using scanner?

Question

I have an arraylist and my goal is to keep adding to an object to the arraylist until the user types in a value. I have two different classes. I have tried to use scanner but that only changes the name of the variable and doesn't create a new object. Would I have to inherit from the other class. How would I keep increasing the size of the arraylist? Any help is appreciated.

Below is my first class:

public class Real_Entertainment 
{
    String BookName; 
    String Author; 
    double Rating; 
    int Purchases;

    public Real_Entertainment(String BookName, String Author, double Rating, int Purchases, int i)
    {
        this.BookName = BookName;
        this.Author = Author;
        this.Rating = Rating;
        this.Purchases = Purchases;
    }
    public void setBookName(String BookName)
    {
        this.BookName = BookName;
    }
    public void setAuthor (String Author )
    {
        this.Author = Author;
    }
    public void setRating (double Rating)
    {
        this.Rating = Rating;
    }
    public void setPurchased (int Purchases)
    {
        this.Purchases = Purchases;
    }

}

Below is my main class:

import java.util.Scanner;
import java.util.ArrayList;

public class Real_Main 
{
    public static void main(String[] args) 
    {
        ArrayList<Real_Entertainment> print = new ArrayList<Real_Entertainment>();
        Real_Entertainment Book1 = new Real_Entertainment("The Nickel Boys ", "Colson 
        Whitehead", 4.3, 500,000);
        Real_Entertainment Book2 = new Real_Entertainment("Olive, Again", "Elizabeth Strout", 6, 
        321,000);
        Real_Entertainment Book3 = new Real_Entertainment("Gingerbread", "Helen Oyeyemi", 2, 
        681,000);
        Real_Entertainment Book4 = new Real_Entertainment ("On Earth We're Briefly Gorgeous", 
        "Ocean Vuong", 2, 421,000);

        print.add(Book1);
        print.add(Book2);
        print.add(Book3);
        print.add(Book4);
    }

    public void addToList(ArrayList<Real_Entertainment> print)
    { 

         //The method where it adds to the arraylist    
    }

}

The problem is unclear, you are already adding to a list using print.add . Please show the attempt you made with scanner. — CausingUnderflowsEverywhere
– CausingUnderflowsEverywhere, Commented Feb 28, 2020 at 4:20
Thanks for the response. I have already added 4 objects without the scanner. Here is my failed attempt of using the scanner Scanner brand = new Scanner(System.in); Scanner BookName = new Scanner (System.in); System.out.println("What is the name of the book?"); String BookName = BookName.nextLine(); — TheGamer27
– TheGamer27, Commented Feb 28, 2020 at 4:22
Take a look at what while loops are: stackoverflow.com/questions/18038533/using-while-loop-in-java — CausingUnderflowsEverywhere
– CausingUnderflowsEverywhere, Commented Feb 28, 2020 at 4:25
Thanks, I have tried that but that only changes the variable how would I also create the object and increase the size of the arraylist — TheGamer27
– TheGamer27, Commented Feb 28, 2020 at 4:26

Bill Horvath · Accepted Answer · 2020-02-28 04:29:36Z

1

What you want to do, conceptually, is capture in the input from the user (e.g., the name of the book), then use that data to instantiate a new Real_Entertainment instance (if that's all you need), then add the new instance to your existing list. For example:

Scanner scanner = new Scanner(System.in);
System.out.print("What is your book's title? ");
String title = scanner.next();
Real_Entertainment realEntertainment = new Real_Entertainment(title, null, 0, 0, 0);
print.add(realEntertainment);

answered Feb 28, 2020 at 4:29

Bill Horvath

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4 Comments

TheGamer27 Over a year ago

Thanks did not think about it that way. Now if I want more information from the user since I have more variables would I change the null to Author

Bill Horvath Over a year ago

Exactly! That's correct - You need to ask the user for each of the inputs that you care about, then use the variable references to them as parameters in your constructor. So for example, if you already have the code above and add String author = scanner.next();, you then build the new Real_Entertainment(title, author, 0, 0, 0)

Bill Horvath Over a year ago

Sure thing! Best of luck!

TheGamer27 Over a year ago

I just had a thought what if I user types in multiple objects how would I create a structure that creates new objects instead of me pre making an object.

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