Java Foundations 3

Question 1

What are the two main categories of data types in Java?

Answer 1

Primitives and reference types.

Question 2

True or False: Java primitives are stored in the heap memory.

Answer 2

False, they are stored in the stack memory.

Question 3

Fill in the blank: In Java, the primitive data type ‘int’ is used to represent _____ numbers.

Answer 3

integer

Question 4

Which of the following is NOT a primitive data type in Java: int, String, char, boolean?

Answer 4

String

Question 5

What type of memory is used for reference types in Java?

Answer 5

Heap memory.

Question 6

True or False: Reference types can hold a reference to an object.

Answer 6

True.

Question 7

What happens to primitives when passed as arguments to methods in Java?

Answer 7

They are passed by value.

Question 8

Multiple choice: Which of the following is a reference type in Java? A) double B) boolean C) ArrayList D) char

Answer 8

C) ArrayList

Question 9

What is the default value of a boolean primitive in Java?

Answer 9

false

Question 10

Fill in the blank: The _____ memory area is used for storing method call information and local variables.

Answer 10

stack

Question 11

True or False: Objects in Java are created in stack memory.

Answer 11

False, they are created in heap memory.

Question 12

What will happen if you try to access a primitive variable that has not been initialized?

Answer 12

A compilation error will occur.

Question 13

In Java, which keyword is used to declare a reference type?

Answer 13

new

Question 14

Multiple choice: When a primitive is passed to a method, what is actually passed? A) Reference B) Object C) Value D) Address

Answer 14

C) Value

Question 15

What is the size of a ‘long’ primitive in Java?

Answer 15

8 bytes.