Java Array Methods Quiz

Which array method would you calculate the sum of all elements in the array arr?

• Use Arrays.stream(arr).sum()

• Use Arrays.sumOf(arr)

• Use arr.getTotal()

• Use arr.total()

What is the purpose of the Arrays.toString() method?

• To sort an array.

• To convert an array to a list.

• To reverse the elements of an array.

• To return a string representation of an array.

Which method is used to copy a portion of an array?

• Arrays.fill()

• Arrays.copyOfRange()

• Arrays.equals()

• Arrays.parallelSort()

What is the difference between Arrays.parallelSort() and Arrays.sort()?

• parallelSort() works only for primitive arrays.

• parallelSort() uses multi-threading.

• parallelSort() is slower.

• There is no difference.

Which method converts a multidimensional array into a string?

• Arrays.toString()

• Arrays.toStream()

• Arrays.convertToString()

• Arrays.deepToString()

What happens if an exception is not caught in a program?

• The program terminates immediately.

• The exception is ignored.

• A runtime warning is issued.

• The program continues execution.

Which exception is thrown when an invalid array index is accessed?

• IndexOutOfBoundsException

• ArrayIndexOutOfBoundsException

• IllegalArgumentException

• NullPointerException

What is a NumberFormatException?

• A checked exception for incorrect number formatting.

• An unchecked exception for invalid string-to-number conversions.

• A subclass of IOException.

• Thrown during compilation.

Which exception is thrown when attempting to divide by zero?

• ArithmeticException

• IllegalArgumentException

• NullPointerException

• ArrayIndexOutOfBoundsException

What type of exception is thrown when an application attempts to use null in a case where an object is required?

• IllegalStateException

• NullPointerException

• NoSuchElementException

• RuntimeException