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Java Default Values and Null

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Questions and Answers

What is the default value of a local variable inside a method in Java?

No default value (correct)
0
false
null

What happens to the object previously referenced by c1 after the assignment c1 = c2?

It is stored in memory
It becomes the new reference
It is garbage collected
It is no longer referenced (correct)

What is the default value of a data field of a reference type?

null (correct)
false
0
'\u0000'

What is the default value of a char type data field?

'\u0000' (D) Signup and view all the answers

What happens when a data field of a reference type does not reference any object?

It holds the value null (C) Signup and view all the answers

What is the default value of a boolean type data field?

false (C) Signup and view all the answers

What is the correct way to invoke a non-static method in Java?

Using an object reference variable, such as myCircle.getArea() (D) Signup and view all the answers

What is the default value of the boolean data field isScienceMajor in the Student class?

False (C) Signup and view all the answers

What is the correct way to invoke a method in the Math class?

Using the class name, such as Math.getArea() (A) Signup and view all the answers

What is the data type of the data field name in the Student class?

String (D) Signup and view all the answers

What is the default value of the char data field gender in the Student class?

'' (D) Signup and view all the answers

Can you invoke a non-static method using the class name?

No, never (D) Signup and view all the answers

What is the primary motivation for using object-oriented programming?

To develop graphical user interfaces and large scale software systems (D) Signup and view all the answers

What defines the identity of an object?

Its unique identity (D) Signup and view all the answers

What is a class in object-oriented programming?

A construct that defines objects of the same type (C) Signup and view all the answers

What is the state of an object composed of?

A set of data fields with their current values (D) Signup and view all the answers

What is the behavior of an object defined by?

A set of methods (A) Signup and view all the answers

What are objects in object-oriented programming?

Entities in the real world that can be distinctly identified (A) Signup and view all the answers