AP CSA Java Arrays

What does the term zero indexing mean?

• Ensuring there is not a DivideByZero Exception
• Assigning the first value in the array to zero
• Initializing a for loop to start at zero
• Labeling the first element of an array zero

Values of different data types can be elements of the same array.

• True
• False

What is valid syntax to construct an array?

• int[] arr1
• int[5] arr1 = new int[]
• int[] arr1 = new int[5]

Arrays can only contain primitive data types.

• True
• False

Once the int[] arr1 has been constructed, the length can be changed by:

• arr1.length = 5;
• arr1 = [5]
• arr1 = int[5]
• The length cannot be changed.

Until a value is assigned to an element of a String array, what is the default value?

• Zero
• Space
• Null
• -1

A method can accept an array as a parameter, and it can return an array.

• True
• False, a method cannot accept an array as a parameter.
• False, a method cannot return an array.
• False, arrays can never be used with methods.

If values have not been assigned to elements of an integer array, the default value is:

• Zero
• Space
• Null
• -1

This is an array called values. What is returned by values[5]?

• 9
• 12
• 6
• 8

This is an array called values. What is the value of values.length?

• 0
• 5
• 6
• 7