39W Final Exam PLTW

What is an array in Java?

• A collection of objects of the same type

• A collection of objects of different types

• A collection of primitive data types

• A collection of different sized objects

How do you declare an array in Java?

• int[] numbers = {1, 2, 3};

• int numbers[] = {1, 2, 3};

• int[] numbers = new int[3];

• All of these

What is the default value of an array element of type int in Java?

• 0

• 1

• Null

• Nan

What is the correct syntax to access the third element of an array named "numbers" in Java?

• numbers[2\

• numbers[2]

• numbers[3]

• numbers(3)

Which loop is commonly used for iterating over an array in Java?

• if-else loop

• fruit loop

• for loop

• while loop

What is the output of the following code snippet?

int[] numbers = {1, 2, 3, 4, 5};

for (int i = 0; i < numbers.length; i++) {

System.out.print(numbers[i] + " ");

}

• 5 4 3 2 1

• 123

• 12

• 1 2 3 4 5

What is the output of the following code snippet?

int[] numbers = new int[5];

for (int i = 0; i < numbers.length; i++) {

System.out.print(numbers[i] + " ");

}

• 0 0 0 0 0

• 5 4 3

• 3 2 1

• 0 0 0

What is an ArrayList in Java?

• A collection of different sized objects

• A collection of primitive data types

• A collection of objects of vanilla types

• A collection of objects of the same type

What is the most appropriate way to check if two Strings are identical?

• string1 == string2

• string1.same(string2)

• string1.equals(string2)

• string1.equalsIgnorecase(string2)

Pick all NON-primitive datatypes from below :

• String

• Primitive

• int

• Array