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Understanding Static Variables and Methods

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Understanding Static Variables and Methods

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Questions and Answers

What is the purpose of a constructor in Java?

To perform operations on variables within a class

To call methods within a class

To define static variables for a class

To create and initialize objects (correct)

Why are the parentheses empty in a constructor declaration?

To declare static variables

To allow for multiple constructors with different parameters

To indicate that the constructor takes no arguments (correct)

To make the constructor private

What is the main difference between static variables and instance variables in Java?

Static variables can be accessed only within the constructor, while instance variables can be accessed anywhere in the class

Static variables belong to individual objects, while instance variables belong to the class as a whole

Static variables are initialized by constructors only, while instance variables are initialized by methods

Static variables belong to the class as a whole, while instance variables belong to individual objects (correct)

Which of the following best describes the role of a default constructor?

It creates and initializes objects without any parameters (C) Signup and view all the answers

Can a constructor have a return type in Java?

No, constructors cannot have a return type in Java (C) Signup and view all the answers

Which type of variable is shared by all objects of its class?

Static variable (A) Signup and view all the answers

How should static variables that are not constants be normally accessed or changed?

Through accessor and mutator methods (B) Signup and view all the answers

What keyword is used in the heading of a method definition to denote it as static?

static (B) Signup and view all the answers

When calling a static method, what should you use instead of the object name?

Class name (B) Signup and view all the answers

Can a static method reference an instance variable of its class?

No, unless it has an object of the class (B) Signup and view all the answers