@@ -0,0 +1,514 @@
+package _4_wildcards;%0A%0Aimport java.util.ArrayList;%0Aimport java.util.Collections;%0Aimport java.util.List;%0A%0Apublic class UnmodifiableList%0A%7B%0A    public static void main(String%5B%5D args)%0A    %7B%0A        List%3CFruit%3E fruits = new ArrayList%3C%3E();%0A        fruits.add(new Apple());%0A    %7D%0A%0A    static class Fruit%0A    %7B%0A%0A    %7D%0A%0A    static class Apple extends Fruit%0A    %7B%0A%0A    %7D%0A%0A    public static %3CT%3E List%3C? extends T%3E reallyUnmodifiableList(List%3C? extends T%3E list)%0A    %7B%0A        return Collections.unmodifiableList(list);%0A    %7D%0A%7D%0A

add unmodifiable list pre-coding example