在ArrayList中创建唯一项的ArrayList

import java.util.ArrayList;

public class UniqueArrayList {
    public static void main(String[] args) {
        ArrayList<Integer> originalList = new ArrayList<>();
        originalList.add(1);
        originalList.add(2);
        originalList.add(3);
        originalList.add(2);
        originalList.add(4);
        originalList.add(1);

        ArrayList<Integer> uniqueList = new ArrayList<>();
        for (Integer item : originalList) {
            if (!uniqueList.contains(item)) {
                uniqueList.add(item);
            }
        }

        System.out.println("Original List: " + originalList);
        System.out.println("Unique List: " + uniqueList);
    }
}

Original List: [1, 2, 3, 2, 4, 1]
Unique List: [1, 2, 3, 4]