Array -Java Programming MCQ Questions and Answers

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What is the purpose of the Arrays.sort() method in Java?

A) To find the maximum element in an array. B) To search for an element in an array. C) To sort the elements of an array. D) To reverse the elements of an array.

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Answer & Solution

Answer: Option C

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How do you find the index of an element in an ArrayList named list in Java?

A) list.getIndex(element); B) list.indexOf(element); C) list.find(element); D) list.search(element);

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Answer & Solution

Answer: Option B

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Which method is used to add an element to the end of an ArrayList in Java?

A) addElement() B) insertElement() C) append() D) add()

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Answer & Solution

Answer: Option D

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What happens when you try to access an element at an index that is out of bounds in an ArrayList in Java?

A) It returns null. B) It throws an ArrayIndexOutOfBoundsException. C) It returns -1. D) It throws an IndexOutOfBoundsException.

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Answer & Solution

Answer: Option B

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Which method is used to remove all elements from an ArrayList in Java?

A) removeAllElements() B) clear() C) remove() D) deleteAll()

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Answer & Solution

Answer: Option B

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In Java, how do you find the maximum element in an array?

A) Use a loop to compare each element with the maximum value found so far. B) Use the max() method. C) Use the findMax() method. D) Use the maximum() method.

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Answer & Solution

Answer: Option A

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Which of the following statements is true about ArrayLists in Java?

A) ArrayLists can only store primitive data types. B) ArrayLists can have duplicate elements. C) ArrayLists are fixed in size. D) ArrayLists can only store Strings.

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Answer & Solution

Answer: Option B

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How do you declare a multi-dimensional array in Java?

A) int[][] matrix; B) int matrix[][]; C) int matrix[2][2]; D) All of the above

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Answer & Solution

Answer: Option D

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What is the purpose of the Arrays.fill() method in Java?

A) To fill an array with a specified value. B) To find the number of elements in an array. C) To copy elements from one array to another. D) To sort the elements of an array.

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Answer & Solution

Answer: Option A

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In Java, what is the purpose of the Arrays.equals() method?

A) To check if two arrays are equal. B) To concatenate two arrays. C) To find the common elements between two arrays. D) To remove duplicate elements from an array.

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Answer & Solution

Answer: Option A

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