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CORE JAVA IMPORTANT QUESTIONS - Part 6

CodingHumans 06 October 0

  CORE JAVA IMPORTANT QUESTIONS 

Part 6


Java is one of the most popular programming language. There is a growing demand for Java Developer jobs in technology companies.

This article contains technical most important core java questions that an interviewer asks for Java technology and related topics. Each question is accompanied with an answer so that you can prepare for job interview and clear your concepts in short time.

we have covered almost 500+ important core Java interview questions for freshers and experienced candidates. This post on CORE JAVA Important Questions is prepared to help you understand the basic concepts of Java programming for interview purposes. All the important JAVA concepts are explained here with examples for your easy understanding.This tutorial covers JAVA topics like basic Java definitions, OOP concepts, Access specifiers, Collections, Exceptions, Threads, Serialization, etc., with examples to make you get ready perfectly to face any JAVA interview confidently.

All the best !


Q1. What is the GregorianCalendar class?

The GregorianCalendar provides support for traditional Western calendars.

Q2. Which Container method is used to cause a container to be laid out and redisplayed?

validate()

Q3. What is the purpose of the Runtime class?

The purpose of the Runtime class is to provide access to the Java runtime system.


Q4. How many times may an object's finalize() method be invoked by the garbage collector?

An object's finalize() method may only be invoked once by the garbage collector.

Q5. What is the purpose of the finally clause of a try-catchfinally statement?

The finally clause is used to provide the capability to execute code no matter whether or not an exception is thrown or caught.

Q6. What is the argument type of a program's main() method?

A program's main() method takes an argument of the String[] type.


Q7. Which Java operator is right associative?

The = operator is right associative.

Q8. What is the Locale class?

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

Q9. Can a double value be cast to a byte?

Yes, a double value can be cast to a byte.


Q10. What is the difference between a break statement and a continue statement?

A break statement results in the termination of the statement to which it applies (switch, for,  do, or while). A continue statement is used to end the current loop iteration and return control  to the loop statement.

Q11. What must a class do to implement an interface?

It must provide all of the methods in the interface and identify the interface in its implements clause.

Q12. What method is invoked to cause an object to begin executing as a separate thread?

The start() method of the Thread class is invoked to cause an object to begin executing as a separate thread.


Q13. Name two subclasses of the TextComponent class.

TextField and TextArea

Q14. What is the advantage of the event-delegation model over the earlier eventinheritance model?

The event-delegation model has two advantages over the event-inheritance model. First, it enables event handling to be handled by objects other than the ones that generate the events  (or their  containers).  This allows a clean separation between a component's design and  its  use. The other advantage of the event-delegation model is that it performs much better in applications where many events are generated. This performance improvement is due to the fact that the event-delegation model does not have to repeatedly process unhandled  events, as is the case of the event-inheritance model.

Q15. Which containers may have a MenuBar?

Frame





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