What is the default value of an object reference declared as an instance variable?

Java Programming Language > Class, Object and Methods in java > About Java Tutorial

Short Question

2237

Answer:

Null, unless it is defined explicitly.

Go to Question List

This Particular section is dedicated to Question & Answer only. If you want learn more about Java Programming Language. Then you can visit below links to get more depth on this subject.

Java Syllabus

Java Tutorial

Java Chapterwise Programs

Java Chapterwise MCQs

Java Chapterwise Q & A

# C Tutorials # JAVA Tutorials # HTML Tutorials # Computer Fundamental # Data Structure # DBMS Tutorials SQL # C# Language # R Language # PHP # Python # Vue JS

Join Our telegram group to ask Questions

Click below button to join our groups.

Ask Question - CSE

Programming Language - PDF

Related Program List

181. Can a top level class be private or protected?

Answer: No, a top level class can not be private or protected. It can have either "public" or no modifier.

# Tutorial: About Java Tutorial

Question: Fundamentals of Object-Oriented Programming Short

182. Why do we need wrapper classes?

Answer: We can pass them around as method parameters where a method expects an object. It also provides utility methods.

# Tutorial: About Java Tutorial

Question: Class, Object and Methods in java Short

183. What is the difference between error and an exception?

Answer: An error is an irrecoverable condition occurring at runtime. Such as OutOfMemory error. Exceptions are conditions that occur because of bad input etc. e.g. FileNotFoundException will be thrown if the specified file does not exist.

# Tutorial: About Java Tutorial

Question: Managing Errors and Exception Short

184. Is it necessary that each try block must be followed by a catch block?

Answer: It is not necessary that each try block must be followed by a catch block. It should be followed by either a catch block or a finally block.

# Tutorial: About Java Tutorial

Question: Fundamentals of Object-Oriented Programming Short

185. When a thread is created and started, what is its initial state?

Answer: A thread is in the ready state as initial state after it has been created and started.

# Tutorial: About Java Tutorial

Question: Fundamentals of Object-Oriented Programming Short

186. What is the Locale class?

Answer: The Locale class is used to tailor program output to the conventions of a particular geographic, political, or cultural region.

# Tutorial: About Java Tutorial

Question: Fundamentals of Object-Oriented Programming Short

187. What are synchronized methods and synchronized statements?

Answer: Synchronized methods are methods that are used to control access to an object. A synchronized statement can only be executed after a thread has acquired the lock for the object or class referenced in the synchronized statement.

# Tutorial: About Java Tutorial

Question: Fundamentals of Object-Oriented Programming Short

188. What is runtime polymorphism or dynamic method dispatch?

Answer: Runtime polymorphism or dynamic method dispatch is a process in which a call to an overridden method is resolved at runtime rather than at compile-time. In this process, an overridden method is called through the reference variable of a superclass.

# Tutorial: About Java Tutorial

Question: Fundamentals of Object-Oriented Programming Short

189. What is Dynamic Binding(late binding)?

Answer: Binding refers to the linking of a procedure call to the code to be executed in response to the call. Dynamic binding means that the code associated with a given procedure call is not known until the time of the call at run-time.

# Tutorial: About Java Tutorial

Question: Fundamentals of Object-Oriented Programming Short

190. Can constructor be inherited?

Answer: No, constructor cannot be inherited.

# Tutorial: About Java Tutorial

Question: Class, Object and Methods in java Short

Chapterwise Java Program
Chapterwise C Program
Chapterwise Data Structure Program