Java Array MCQs with answers Page - 7

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Q. What is the result of this code?
int[] arr = new int[]{1, 2, 3};
System.out.println(arr[3]);

  • (A) 3
  • (B) 0
  • (C) ArrayIndexOutOfBoundsException
  • (D) null

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Q. Which of the following creates a jagged array in Java?

  • (A) int[][] arr = new int[2][2];
  • (B) int[][] arr = new int[2][];
  • (C) int[][] arr = {{1, 2}, {3, 4}};
  • (D) int[][] arr = new int[][];

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Q. What is printed?
int[] a = new int[3];
a[0] = 5;
System.out.println(a[0]);

  • (A) 5
  • (B) 0
  • (C) 1
  • (D) null

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Q. Which keyword is used to allocate memory for an array?

  • (A) create
  • (B) allocate
  • (C) new
  • (D) make

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Q. Which class contains utility methods for array operations?

  • (A) ArrayUtils
  • (B) ArrayHelper
  • (C) Arrays
  • (D) Collections

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Q. Which of these is the correct syntax to declare an array of doubles?

  • (A) double arr[];
  • (B) double[] arr;
  • (C) Both A and B
  • (D) None of the above

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Q. Which of the following best describes an array?

  • (A) A class
  • (B) An object
  • (C) A primitive type
  • (D) A method

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Q. Which property is used to get the size of an array?

  • (A) size
  • (B) length()
  • (C) length
  • (D) count

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Q. How are multidimensional arrays implemented in Java?

  • (A) As tables
  • (B) As linked lists
  • (C) As arrays of arrays
  • (D) As trees

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Q. What will be the output?
int[] x = {1, 2, 3};
System.out.println(x.length);

  • (A) 2
  • (B) 3
  • (C) 1
  • (D) Error

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