Java - How to check if a list is in list of lists [closed]

Question

I have a list and list of lists.

How do I check if data is in sheet list and remove it from data list? I tried using containsAll() but it's not removing the same list. I might be doing something wrong.

import java.util.*;

public class RemoveSameListData {
    public static void main(String[] args) {
        List<List<Object>> sheet = new ArrayList<>();
        List<Object> data = new ArrayList<>();
        data.add("a");
        data.add("a");
        data.add("b");
       
        List<Object> data2 = new ArrayList<>();
        data2.add("c");
        data2.add("b");
        data2.add("bv");

        List<Object> data3 = new ArrayList<>();
        data3.add("s");
        data3.add("as");
        data3.add("e");
        
        sheet.add(data);
        sheet.add(data2);
        sheet.add(data3); //here sheet is [[a, a, b], [c, b, bv], [s, as, e]]


        for (List<Object> sameData : sheet) {
           if(data.containsAll(sameData)) {
              data.remove(sameData);
           }
        }
        System.out.println(data);
    }
}

Basically, i want to be able to remove list from data that's available in sheet.

Any input is always appreciated. Thank you

Answer 1

like @Lei Yang pointed out in his comment (credits to him!), the equality of list's is checked by equality of the objects.
Thus this succeeds:

List<List<Object>> sheet = new ArrayList<>(List.of(List.of("a", "a", "b"), List.of("c", "b", "bv"), List.of("s", "as", "e")));
List<Object> data = List.of("a", "a", "b");
assertTrue(sheet.remove(data));