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Java Array Programs

Here are 10 essential multiple-choice questions on Java Array Programs, covering key concepts.

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Question 1

What will be the output of the following program?

Java

int[] arr = {5, 10, 15, 20, 25};
int sum = 0;
for (int num : arr) {
    sum += num;
}
System.out.println(sum);

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Question 2

How do you find the largest element in an array in Java?

Using Collections.max(arr)
Iterating and comparing each element
Using Math.max(arr)
Sorting and taking the first element

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Question 3

What will be the output of the following code?

Java

int[] arr = {3, 1, 4, 1, 5, 9};
Arrays.sort(arr);
System.out.println(arr[0]);

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Question 4

What is the best way to reverse an array in Java?

Using Collections.reverse()
Using a loop with swapping
Using Arrays.reverse()
Using Math.reverse()

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Question 5

What will be the output of the following program?

Java

int[] arr = {1, 2, 3, 4, 5};
System.out.println(arr.length);

4
5
6
Compilation Error

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Question 6

How do you check if two arrays are equal in Java?

arr1 == arr2
Arrays.equals(arr1, arr2)
arr1.equals(arr2)
arr1.compare(arr2)

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Question 7

What will be the output of the following program?

Java

int[] arr1 = {1, 2, 3};
int[] arr2 = arr1;
arr2[0] = 10;
System.out.println(arr1[0]);

1
10
Compilation Error
Runtime Error

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Question 8

What is the correct way to copy an array in Java?

arr2 = arr1;
arr2 = Arrays.copyOf(arr1, arr1.length);
arr2.clone(arr1);
Arrays.copy(arr1, arr2);

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Question 9

How do you find duplicate elements in an array?

Using HashSet
Using arr.contains()
Using arr.duplicates()
Java does not support duplicate detection

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Question 10

What is the time complexity of linear search in an array?

O(1)
O(log n)
O(n)
O(n^2)

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