AP Computer Science A U7L1ES

According to the text, how do ArrayLists compare to Arrays?

• They are completely different with no similarities.

• They are exactly the same with no differences.

• They may sound similar but have pros and cons.

• They are unrelated topics not covered in the same unit.

What can an ArrayList hold according to the learning objectives?

• Only primitive data types

• Multiple data types including primitives and class types

• Only class type data and not primitives

• Only single instances of data at a time

What is another learning objective related to ArrayLists?

• Learn how to sort data within an ArrayList

• Understand the limitations of ArrayLists in multithreading

• Learn some of the methods which can be called by objects of the ArrayList class

• Write code that removes all data from an ArrayList

Which of the following is NOT an example of a class data type that can be held in an ArrayList?

• Strings

• Circles

• Integers

• Other classes we have created

What is the main advantage of an ArrayList over an Array in Java?

• ArrayLists have a fixed size.

• ArrayLists can only store objects of the same type.

• ArrayLists allow for the dynamic resizing and easy manipulation of elements.

• ArrayLists are more memory efficient than Arrays.

What does it mean when we say that an ArrayList is mutable?

• It cannot be changed once created.

• It can only be accessed by methods within its class.

• It can be changed, such as adding or removing elements.

• It is immutable and cannot be resized.

Which of the following code snippets correctly adds three items to an ArrayList named 'list' in Java?

• list.add("Item1"); list.add("Item2"); list.add("Item3");

• list.append("Item1"); list.append("Item2"); list.append("Item3");

• list.insert("Item1"); list.insert("Item2"); list.insert("Item3");

• list.put("Item1"); list.put("Item2"); list.put("Item3");

What is the result of calling the remove() method on an ArrayList?

• It adds an element to the end of the list.

• It replaces an object at a specific index with a new object.

• It deletes the object at the specified index position and shifts subsequent elements to the left.

• It returns the number of objects in the list.

What does the contains() method do when used with an ArrayList?

• It removes a specific object from the ArrayList.

• It checks to see whether the list contains a specific object and returns true or false.

• It adds a new object to the ArrayList.

• It sorts the objects within the ArrayList.

What are Integer and Double in the context of Java programming?

• Methods for mathematical operations

• Primitive data types for int and double

• Wrapper classes for the primitive types int and double

• Interfaces for numeric operations