To implement the missing methods in the MyList interface, you can create a class that implements the interface and provide the necessary code for each method.
The methods addAll, removeAll, retainAll, containsAll(), and toArray(t[]) are commonly used in Java collections to perform operations on lists. However, these methods are not included in the MyList interface by default. To implement these methods, you can create a class that implements the MyList interface and provide the necessary code for each method.
For example, to implement the addAll() method, you can iterate over the elements in the specified collection and add them to the current list. The removeAll() method can be implemented by iterating over the elements in the specified collection and removing any that match the elements in the current list.
The retainAll() method can be implemented by iterating over the elements in the current list and removing any that do not exist in the specified collection. The containsAll() method can be implemented by checking if each element in the specified collection exists in the current list. Lastly, the toArray(t[]) method can be implemented by creating an array of the specified type and populating it with the elements in the current list.