Remove Elements From List

RemoveElementsFromList.java

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

public class RemoveElementsFromList {
    public static void main(String[] args) {
        List<String> list = new ArrayList<>(List.of("java","is", "is", "awesome"));

        // remove element at index 2
        list.remove(2);

        //output: [java, is, awesome]
        System.out.println(list);


        list = new ArrayList<>(List.of("java","is", "is", "awesome", "is"));
        // remove the first "is"
        list.remove("is");
        // output: [java, is, awesome, is]
        System.out.println(list);

        List<String> auxiliaries = new ArrayList<>(List.of("am", "is", "are"));

        list = new ArrayList<>(List.of("java is","is", "are", "awesome", "is"));

        // remove all elements that exist in auxiliaries list
        list.removeAll(auxiliaries);

        // output: [java is, awesome]
        System.out.println(list);


        List<Integer> integerList = new ArrayList<>(List.of(1, 2, 3, 4, 5, 6, 7, 8, 9));

        // remove all even numbers
        integerList.removeIf(e-> e % 2 == 0);
        // output: [1, 3, 5, 7, 9]
        System.out.println(integerList);

        List<Integer> first = new ArrayList<>(List.of(1, 2, 3, 4, 5, 6));
        List<Integer> second = new ArrayList<>(List.of(1, 2, 3));

        // remove all element from first list and retain only second list element
        first.retainAll(second);
        System.out.println(first); // [1, 2, 3]
    }
}