APCSA Unit 7 On AP Classroom Study Quiz

What Is The Difference Between An Array And An ArrayList

• Arrays are dynamic-size and can only store objects, while ArrayLists are fixed-size and can store primitive data types and objects.
• Arrays can only store primitive data types, while ArrayLists can store both primitive data types and objects.
• Arrays and ArrayLists are the same in terms of size and data types they can store.
• Arrays are fixed-size, can store primitive data types and objects, while ArrayLists are dynamic-size and can only store objects.

What Exactly Is An ArrayList

• An ArrayList is a dynamic array in Java that allows for the coder to add as much data values needed

• An ArrayList is a fixed-size array in Java that allows for the coder to add a fixed number of values at the intialization stage

• An ArrayList is a linked list in Java.

• An ArrayList is a primitive data type in Java.

How Do You Intialize An ArrayList

• ArrayList listName = new ArrayList<>();
• ArrayList listName = new ArrayList();
• ArrayL listName = new ArrayL();

• ArrayList listName = new ArrayList<>;

What Does The Add() Method Do In ArrayLists

• It removes an element from the list
• It multiplies two elements in the list
• It divides an element by another in the list
• It adds a specified element to the end of the list or at a specific part in the ArrayList

What Does The Remove Method Do In ArrayLists

• Removes the element at the specified index
• Adds a new element to the ArrayList
• Returns the size of the ArrayList
• Updates the element at the specified index

What Does The Set Method Do In ArrayLists

• Returns the index of the specified element
• Adds a new element to the end of the ArrayList
• Replaces the element at the specified index with the specified element.
• Removes the element at the specified index

How Do You Return An ArrayList In A Method

• public ArrayList returnArrayList() { return new ArrayList(); }
• ArrayList list = new ArrayList<>(); return list;
• public ArrayList returnArrayList() { ArrayList list = new ArrayList<>(); list.add("element1"); list.add("element2"); return list; }
• public void returnArrayList() {

How Do You Traverse An ArrayList In Coding

• Use a while loop to iterate through each element in the ArrayList
• Use a for loop to iterate through each element in the ArrayList by accessing them using the get() method.
• Access elements randomly in the ArrayList
• Use recursion to traverse the ArrayList

How do you access the element at index 2 in an ArrayList `list`?

• `list[2];`

• `list.get(2);`

• `list.elementAt(2);`

• `list.indexOf(2);`

Which of the following is the correct way to initialize an ArrayList of Strings?

• `ArrayList list = new ArrayList();`

• `ArrayList list = new ArrayList();`

• `List list = new ArrayList<>();`

• All of the above