generics example

package ch.claude_martin;

import java.util.*;

public class SomeClass {

    public static void main(String args[]) {
        final class A<T> {
            private T value;

            public A(T value) {
                this.value = value;
            }

            public T getValue() {
                return value;
            }
        }

        A<? extends Number> a1 = new A<>(42);
        System.out.println(a1.getValue());

        A<? super ArrayList<Integer>> a2 = new A<>(new LinkedList<Number>(Arrays.asList(1.2, Math.PI, -0)));
        System.out.println(a2.getValue());
    }
}