Java Arrays Prt 1Quiz

What is the main purpose of an array in Java?

• To store multiple data types

• To store a single value only

• To create a collection of indexed like values

• To link classes and objects

What is the default value assigned to elements in a newly created int array?

• Null

• -1

• Random values

• 0

What is the valid way to declare and create an array in a single line?

• int numbers; = new int[6];

• int numbers = new int[];

• int[] numbers = new int[6];

• int[] = new int[6] numbers;

What happens if you access an array index that is out of bounds?

• The value returned is null

• Compilation error

• ArrayIndexOutOfBoundsException

• It returns the last element

Which of the following is an off-by-one error?

• Initialising array with a negative size

• Accessing index from 0 to array.length

• Declaring an array without specifying a size

• Using the wrong data type

What does the .length property of an array return?

• Number of non-zero elements

• Maximum index

• Number of elements in the array

• Total memory used by the array

Which loop is recommended for read-only access to all elements in an array?

• while loop

• do-while loop

• enhanced for loop

• nested loop

What is true about reassigning array references?

• You can assign an array of one type to another type

• Reassignment increases the original array’s size

• The original array becomes eligible for garbage collection

• Java does not allow reassignment

How can you copy the contents of one array to another correctly?

• array2 = array1;

• Use System.arraycopy()

• Loop through each element and assign

• Both B and C

When passing an array element to a method, it is treated as:

• An array object

• A reference

• A simple variable

• A string