Object creation in Java - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is an object in Java?

An object is a real-world entity that has state (attributes) and behavior (methods). It is an instance of a class.

beginner

How do you create an object in Java?

You create an object by using the <code>new</code> keyword followed by the class constructor, for example: <code>ClassName obj = new ClassName();</code>

intermediate

What does the new keyword do in Java?

The new keyword allocates memory for the new object on the heap and calls the constructor to initialize it.

beginner

What is a constructor in Java?

A constructor is a special method used to initialize new objects. It has the same name as the class and no return type.

beginner

Can you create multiple objects from the same class?

Yes, you can create many objects from the same class, each with its own separate state.

Which keyword is used to create an object in Java?

A init

B create

C object

D new

The new keyword is used to create new objects in Java.

What does a constructor do in Java?

A Deletes an object

B Calls a method

C Initializes a new object

D Allocates memory only

A constructor initializes a new object when it is created.

What is the correct way to create an object of class Car?

A Car c = new Car();

B Car c = Car();

C new Car c = Car();

D create Car c = new Car();

The correct syntax uses new followed by the constructor: Car c = new Car();

Where is the memory allocated when you create a new object in Java?

A Heap

B Register

C Stack

D Code segment

Objects are stored in the heap memory in Java.

Can you create two objects from the same class?

A No, only one object per class

B Yes, multiple objects can be created

C Only if the class is static

D Only if the class has no constructor

You can create as many objects as you want from the same class.

Explain how to create an object in Java and what happens behind the scenes.

Think about the steps from writing code to having a usable object.

Describe the role of a constructor in object creation.

Focus on what makes constructors special compared to other methods.