Question

Write a variable-arity version of the remove method. The return value is the total number of elements removed from the bag. Your implementation should use the array version of a for-loop from page 111.

Answer 1

To write a variable-arity version of the remove method, you can use the remove All method from the java.util.ArrayList class.

Step-by-step explanation:

To write a variable-arity version of the remove method, you can use the removeAll method from the java.util.ArrayList class. This method takes a collection as its argument and removes all occurrences of elements in that collection from the list, returning the number of elements removed.

Here's an example:

public int remove(Object... elements) {
 List<Object> list = new ArrayList<>(Arrays.asList(elements));
 return myArrayList.removeAll(list);
}

In this example, the remove method accepts variable arguments, converts them to a list, and uses the removeAll method to remove all occurrences of those elements from the myArrayList. The return value is the number of elements removed.