Java Array & Loop Quiz

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

• int arrayName[] = new int[size];

• int arrayName[size];

• int[] arrayName = new int[size];

• int arrayName = new int[size];

How can you initialize an array in Java?

• int[] arr = new int[1, 2, 3, 4, 5];

• int arr[] = new int[]{1, 2, 3, 4, 5};

• int[] arr = new int[5];

• int[] arr = {1, 2, 3, 4, 5};

Which loop in Java is ideal for iterating over an array?

• switch statement

• while loop

• do-while loop

• for-each loop

What is the syntax for a 'for' loop in Java?

• for(start; end; step) { // code block }

• for(initialization; condition; iteration) { // code block }

• for(initialization; condition; update) { // code block }

• for(initialization; condition; increment) { // code block }

When should you use a 'while' loop in Java?

• When you want to execute a block of code a fixed number of times.

• When you want to handle exceptions in Java.

• When you want to repeat a block of code based on a condition.

• When you want to define a class in Java.

What is the purpose of an enhanced for loop in Java?

• To handle user input

• To simplify the process of iterating over arrays or collections.

• To perform mathematical calculations

• To create new variables

How do you declare an array of integers in Java?

• int[] arrayName;

• int arrayName();

• arrayName = new int[];

• int arrayName[];

What is the index of the first element in an array in Java?

• null

• -1

• 1

• 0

What happens if you try to access an index outside the bounds of an array in Java?

• IndexOutOfBoundsException

• ArrayOutOfBoundsException

• OutOfBoundsError

• ArrayIndexOutOfBoundsException

What is the difference between a 'for' loop and a 'while' loop in Java?

• In a 'for' loop, the initialization, condition check, and iteration are all done in one line, making it more concise and readable. On the other hand, a 'while' loop requires the initialization and iteration to be done manually within the loop body.

• A 'for' loop is more memory-efficient than a 'while' loop

• A 'for' loop can only iterate over arrays, while a 'while' loop can iterate over any data structure

• A 'for' loop always executes at least once, unlike a 'while' loop