Understanding ArrayLists in Java

Why can't we use a fixed-size array for a grocery list?

• Arrays can only store integers.

• Fixed-size arrays automatically resize.

• It requires knowing the exact number of items in advance.

• Grocery items are too complex for arrays.

What is the default size of an ArrayList when first created?

• 15

• 10

• 5

• 20

How does an ArrayList manage its capacity when more elements are added?

• It compresses the data

• It creates a new array of a larger size

• It remains the same size

• It deletes the oldest item

What happens when the number of items in an ArrayList exceeds its current capacity?

• It removes the first item

• It stops accepting new items

• It maintains the same size

• It increases its size by creating a new array

Why must wrapper classes be used with ArrayLists?

• To improve performance

• ArrayLists can only store object types

• Primitive types are not compatible with Java

• Wrapper classes are easier to use

What must be done to store integers in an ArrayList?

• Use the 'Integer' wrapper class

• Convert integers to strings

• Store as character values

• Use the 'int' type directly

Which package do you need to import to use ArrayList in Java?

• java.util.ArrayList

• java.util.List

• java.ArrayList

• java.List

What syntax is used to specify the type of elements in an ArrayList?

• Square brackets []

• Parentheses ()

• Angle brackets <>

• Curly braces {}

Which of the following is a correct way to instantiate an ArrayList in Java?

• new List()

• ArrayList.new

• new ArrayList()

• List.newArrayList()

Why is an ArrayList considered more flexible than a traditional array?

• It performs faster than arrays

• It automatically adjusts its size

• It can only store specific types of objects

• It has a fixed size