Question 1

What is the primary use of ArrayList in Java?

Accepted Answer

To store a collection of reference data types.

Answer

To create a single element object.

Answer

To store data in a linear file structure.

Answer

To store a fixed-size collection of primitive data types.

Question 2

What is one key difference between arrays and ArrayLists?

Accepted Answer

ArrayLists can change size after creation, while arrays cannot.

Answer

Arrays are only used for numeric data.

Answer

Arrays can store more data types than ArrayLists.

Answer

ArrayLists are faster than arrays.

Question 3

Which data type can NOT be directly stored in an ArrayList?

Accepted Answer

Primitive data types like int.

Answer

Objects

Answer

Strings

Answer

Boolean values

Question 4

How do you add an element to the end of an ArrayList?

Accepted Answer

Using the `add` method without an index parameter.

Answer

Using the `set` method.

Answer

Using the `add` method with an index.

Answer

Using the `insert` method.

Question 5

What method would you use to remove an element from an ArrayList?

Accepted Answer

The `remove` method.

Answer

The `delete` method.

Answer

The `discard` method.

Answer

The `removeAt` method.

Question 6

What is the function of the `get` method in an ArrayList?

Accepted Answer

To retrieve an element at a specified index.

Answer

To find the location of an element.

Answer

To add a new element to the list.

Answer

To count the number of elements in the list.

Question 7

If you want to change the value of an existing element in an ArrayList, which method do you use?

Accepted Answer

The `set` method.

Answer

The `replace` method.

Answer

The `update` method.

Answer

The `add` method.

Question 8

Which of the following methods returns the number of elements in an ArrayList?

Accepted Answer

The `size` method.

Answer

The `total` method.

Answer

The `count` method.

Answer

The `length` method.

Question 9

To traverse an ArrayList and access each element, which loop structure is typically recommended?

Accepted Answer

A for loop with the index based on `list.size()`.

Answer

A while loop without conditions.

Answer

A for-each loop.

Answer

A do-while loop.

Question 10

What is the purpose of the constructor when creating an ArrayList?

Accepted Answer

To initialize a new ArrayList object.

Answer

To add elements automatically.

Answer

To define the maximum size of the ArrayList.

Answer

To create a copy of an existing ArrayList.

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