#084 ArrayLists

What is the first difference that is expressed in the video between an Array and an ArrayList?

• ArrayLists require importing a specific class before use

• Regular arrays don't need to specify a data type

• ArrayLists must have a fixed size when created

• Regular arrays can only hold primitive data types

When creating a new ArrayList, what is true about its initial size?

• It starts with size 10 by default

• It starts with size 0 and grows as needed

• You must specify the initial size

• It has the same size as the last ArrayList created

 What happens to existing elements when you use add(1, "tuna") on an ArrayList?

• The existing element at index 1 is replaced

• All existing elements are deleted

• Elements from index 1 onward shift right by one position

• The new element is added only if index 1 is empty

How do the two versions of the add() method differ in functionality?

• One adds integers, the other adds strings

• One adds single elements, the other adds multiple elements

• One returns true, the other returns false

• One adds at the end, the other adds at a specified index

What is the key difference between set() and add() methods?

• set() can only modify existing indexes while add() can expand the list

• set() works with strings only

• add() can only append to the end

• There is no difference

What happens when you remove() an element from an ArrayList?

• The space is left empty

• A null value replaces the removed element

• Subsequent elements shift left to fill the gap

• The ArrayList size stays the same

Which statement about ArrayList limitations is correct?

• ArrayLists can hold both primitive and object types directly

• ArrayLists can only hold primitive types

• ArrayLists can only hold object types

• ArrayLists can only hold strings

How does modern Java handle primitive-to-wrapper conversion?

• It must always be done manually

• It uses autoboxing to handle conversion automatically

• It's not possible to convert primitives

• It requires external libraries

How do you access the number of elements in an ArrayList versus an array?

• Both use .length()

• ArrayList uses .size() and array uses .length

• Both use .size()

• ArrayList uses .length and array uses .size()