Alias versus copy of an ArrayList

import java.util.*;

public class Main {
    public static void main(String[] args) {
        List<Integer> a = new ArrayList<>(List.of(1, 2));
        List<Integer> b = a;
        List<Integer> c = new ArrayList<>(a);
        b.add(3);
        c.add(4);
        System.out.println(a);
        System.out.println(b);
        System.out.println(c);
    }
}