Quiz 01

What is the primary purpose of an array in Java?

• To create a dynamic list of elements

• To store multiple data items of the same datatype

• To perform mathematical operations

• To store multiple data items of different datatypes

Which of the following is the correct way to declare an array in Java?

• int ages[];

• int[] ages;

• int ages;

What happens if you try to access an index greater than the size of an array?

• The program will terminate without an error

• An array-index-out-of-bounds exception will occur

• The value will be set to zero

• The program will return a null value

How do you instantiate an array in Java?

• int numbers= new int[100];

• int[] numbers= new int[100];

• int numbers[] = new int[100];

What is the index of the last element in an array of size n?

• n

• n+1

• n-1

• 0

Which of the following statements is true about array length?

• The length of an array is always 0

• The length of an array is fixed once initialized

• The length of an array can be accessed using arrayName.size

• You can change the length of an array after instantiation

What is a multidimensional array?

• An array of arrays

• An array that can hold multiple data types

• An array that only holds integers

• An array that can change size dynamically

How do you access the first element of a two-dimensional array named 'matrix'?

• matrix[0][0]

• matrix[1][1]

• matrix[0][1]

• matrix[1][0]

Which of the following is a correct way to instantiate a two-dimensional array?

• int[][] matrix= new int[3][4];

• int matrix[3][4];

• int matrix[][] = new int[3][4];

What is the purpose of using named constants for array sizes?

• To prevent errors in array indexing

• To improve performance

• To allow dynamic resizing of arrays

• To make the code more readable