Remove duplicate items from an ArrayList

import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;

public class Main {
public static void main(String[] argv) {
List arrayList1 = new ArrayList();

arrayList1.add("A");
arrayList1.add("A");
arrayList1.add("B");
arrayList1.add("B");
arrayList1.add("B");
arrayList1.add("C");

HashSet hashSet = new HashSet(arrayList1);

List arrayList2 = new ArrayList(hashSet);

for (Object item : arrayList2)
System.out.println(item);
}
}

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