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Constructors in Java Programming

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Questions and Answers

What is the main reason why static variables that are not constants should normally be private?

To prevent any changes to the variables
To make them accessible to all methods
To increase their visibility in the class
To restrict access to the variables (correct)

How is a static method different from a regular method?

A regular method is more efficient in memory usage
A regular method can access instance variables directly
A static method requires an instance of a class to be executed
A static method can be invoked without creating an object (correct)

Why can't a static method reference an instance variable of a class?

Due to limitations in the Java programming language
To prevent changes to the instance variables
To enforce encapsulation of the class
Because static methods don't have access to object-specific data (correct)

What happens if you try to invoke a non-static method from a static method directly?

It results in a compilation error (A) Signup and view all the answers

In Java, how should a static method be invoked?

Using the class name (A) Signup and view all the answers

Which keyword is used to call a constructor in Java?

new (D) Signup and view all the answers

What is the purpose of a constructor in Java?

To initialize objects (C) Signup and view all the answers

What does an empty set of parentheses in a constructor indicate in Java?

It requires no arguments (B) Signup and view all the answers

What type of variables do static variables belong to in Java?

Class variables (C) Signup and view all the answers

Can a constructor have a return type in Java?

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

What is the role of a static method in Java?

To be shared by all objects of the class (B) Signup and view all the answers

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