Lower bounded wildcard

SampleJavaTest.java

package ru.maksim.sample;

import org.junit.jupiter.api.Test;

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

public class SampleJavaTest {

    @Test
    void foo() {
        addNumbers(new ArrayList<>());
        addNumbers(new ArrayList<Number>());
        addNumbers(new ArrayList<Object>());
    }

    public static void addNumbers(List<? super Integer> list) {
        for (int i = 1; i <= 10; i++) {
            list.add(i);
        }
    }
}