Exercise 3 - ArrayList - Code Doesn't Execute


The ArrayList exercise (https://www.codecademy.com/courses/learn-java/lessons/data-structures/exercises/arraylist?action=lesson_resume) doesn't execute the code and as soon as I hit "Run", the compilation begins and continues forever. No error messages displayed.
I am unable to understand, what I am doing wrong.

import java.util.ArrayList;

public class Temperatures {
    public static void main(String[] args) {
    ArrayList<Integer> weeklyTemperatures = new ArrayList<Integer>(); 



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