list.remove(1): index or value?

Predict the outputEasy-MediumJava only

Main.java

import java.util.*;

public class Main {
    public static void main(String[] args) {
        List<Integer> list = new ArrayList<>(List.of(10, 20, 30));
        list.remove(1);
        System.out.println(list);
        list.remove(Integer.valueOf(10));
        System.out.println(list);
    }
}

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