- Courses
- Tutorials
- Practice
- Jobs
Java Arrays
Question 1
Which of the following is the correct way to declare an array in Java?
- A
int arr[5];
- B
int arr = new int(5);
- C
int[] arr = new int[5];
- D
array<int> arr = new int[5];
Question 2
What will be the output of the following code?
int[] arr = {1, 2, 3, 4, 5};
System.out.println(arr[2]);
- A
1
- B
2
- C
3
- D
4
Question 3
What is the default value of an integer array in Java?
- A
null
- B
0
- C
garbage value
- D
depends on JVM
Question 4
Which of the following is used to determine the length of an array in Java?
- A
arr.length();
- B
arr.size;
- C
arr.length;
- D
arr.count();
Question 5
What is the time complexity for accessing an element in an array by index?
- A
O(1)
- B
O(n)
- C
O(log n)
- D
O(n^2)
Question 6
Which of the following creates an array of 5 integers?
- A
int arr[] = new int[5];
- B
int arr[5];
- C
int arr() = 5;
- D
int[5] arr;
Question 7
How do you access the third element of an array arr?
- A
arr(3)
- B
arr[3]
- C
arr[2]
- D
arr{3}
Question 8
How many rows and columns are in a 2D array int[][] arr = new int[3][4];?
- A
3 rows, 4 columns
- B
4 rows, 3 columns
- C
3 elements
- D
7 elements
Question 9
Which of these best defines a multidimensional array in Java?
- A
int arr[][]
- B
int[] arr[]
- C
Both a and b
- D
int arr(2)(3)
There are 9 questions to complete.
