Why aren't Java Collections remove methods generic?

Question

Why isn\'t Collection.remove(Object o) generic?

Seems like Collection could have boolean remove(E o);

Then, when you ac

Answer 1

Another reason is because of interfaces. Here is an example to show it :

public interface A {}

public interface B {}

public class MyClass implements A, B {}

public static void main(String[] args) {
   Collection collection = new ArrayList<>();
   MyClass item = new MyClass();
   collection.add(item);  // works fine
   B b = item; // valid
   collection.remove(b); /* It works because the remove method accepts an Object. If it was generic, this would not work */
}