Java HF Chapter 2

What represents an object's state in Java?

• Instance Variables
• Methods
• Main Method
• Dot Operator

Answer explanation

Instance variables in Java represent the state of an object.

In Java, what do you call the blueprint for an object?

• Class
• Object
• Instance
• Method

Answer explanation

A class in Java serves as the blueprint for creating objects.

How are objects created in Java?

• Using the new keyword
• Using main() method
• Using inheritance
• Using dot operator

Answer explanation

Objects are created in Java using the new keyword.

What is the purpose of the dot operator in Java?

• Accessing object's state and behavior
• Defining classes
• Declaring variables
• Executing methods

Answer explanation

The dot operator is used to access an object's state and behavior in Java.

In which memory area do Java objects reside when created?

• Heap
• Stack
• Queue
• Array

Answer explanation

Java objects reside in the heap memory when created.

What does a class represent in Java?

• Blueprint for an object
• Object's state
• Instance variables
• Methods

Answer explanation

A class in Java is a blueprint for creating objects.

Why is the main() method used in Java applications?

• To test the real class
• To launch/start the Java application
• To create objects
• To define instance variables

Answer explanation

The main() method is used to start the Java application.

What is the purpose of a garbage collector in Java?

• Reclaiming memory space
• Creating objects
• Allocating memory
• Defining classes

Answer explanation

The garbage collector in Java is responsible for reclaiming memory space by removing unreachable objects.

How can you make a method globally accessible in Java?

• Mark it as public and static
• Use inheritance
• Define it in the main() method
• Declare it as a constant

Answer explanation

Marking a method as public and static makes it globally accessible in Java.

In OOP, what does an object know about itself?

• Instance Variables
• Methods
• Class Structure
• Inheritance

Answer explanation

In OOP, an object knows about itself through instance variables.