Question

Invoking _______ removes all elements in an ArrayList x.

A. ()
B. ()
C. ()
D. ()
E. ()

Answer 1

The clear() method removes all elements from an ArrayList in Java. Calling x.clear() will leave the ArrayList named x empty, but the list will still exist.

Step-by-step explanation:

The question is asking which method invocation removes all elements from an ArrayList in Java. To clear an ArrayList named x, you need to call the clear() method on it, like so: x.clear();.

For example, if you have an ArrayList of Strings with some values:

ArrayList<String> x = new ArrayList<>();
x.add("Apple");
x.add("Banana");
x.add("Cherry");
// x contains [Apple, Banana, Cherry]

Invoking x.clear(); will remove all the elements, leaving the list empty:

// Now x is []

Remember that after calling the clear() method, the list x will still exist; it will just be empty. If you wish to actually delete the list, you would need to set it to null.