Java - Reading from an ArrayList from another class

Question

We\'ve not covered ArrayLists only Arrays and 2D arrays. What I need to do is be able to read from an ArrayList from another class. The main aim is to read from them in a fo

Answer 1

Here you're simply creating two completely unrelated lists. Either have the array list be a property of the Objects class and retrieve it through an instance method, or return it from an instance or static method, or make the property static. IMO the first two are preferable in most situations.

public class Objects {
    public static List getXcoords() {
        List xcoords = new ArrayList();

        // Your same code, but adding:
        return xoords;
    }
}

Then to use it:

import java.util.ArrayList;

public class Main {
    // Note the lower-case "main" here. You want that.
    public static void main() {
        List xcoords = Objects.getXcoords();
        // etc.

Also, your List should be of Integer, not of Objects, which would create a collection holding instances of Objects. You may want to take a step back and relate lists to arrays in a better way--you wouldn't create an array of Objects, would you? No, you'd have an array of int or Integer.

Also, there's Arrays.asList.