Java Quiz

Which loop always executes at least once?

• for loop

• while loop

• do-while loop

• All of the above

Which of the following is the correct syntax for a for loop in Java?

• for (i = 0, i < 10, i++)

• for (int i = 0; i < 10; i++)

• for (int i = 0, i < 10, i++)

• for (int i = 0; i < 10; i+=1)

Which of the following best describes the use of a for loop in Java?

• It is used when the number of iterations is known beforehand.

• It is used to iterate indefinitely.

• It is used when a condition must be checked after the loop body executes.

• It is used only for traversing arrays.

Why is it important to properly initialize, update, and terminate the loop control variable?

A)

B)

C)

D)

Answer: B)

• To prevent memory leaks.

• To ensure the loop does not become an infinite loop.

• To use the break and continue statements effectively.

• To optimize CPU usage.

How do you declare an array in Java?

• int array[];

• int[] array;

• Both a and b

• None of the above

How do you initialize an array with values in Java?

• int[] arr = new int[]{1, 2, 3};

• int[] arr = {1, 2, 3};

• int arr = {1, 2, 3};

• Both a and b

What is the default value of elements in an integer array?

• a) 1

• b) -1

• c) 0

• d) null

How can you find the length of an array in Java?

• a) array.size()

• b) array.length()

• c) array.length

• d) array.getLength()

What happens if you try to access an index that is out of bounds in an array?

• a) The program will crash.

• b) The program will ignore the statement.

• c) ArrayIndexOutOfBoundsException is thrown.

• d) The value will be set to 0.

Which of the following methods are used to sort an array in Java?

• a) Arrays.sort()

• b) Collections.sort()

• c) array.sort()

• d) List.sort()