Java Tricky Interview Questions And Answers Pdf
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- Top 10 Tricky Java interview questions and Answers
- Java interview questions for 5 years experience
- Top 10 Tough Core Java Interview Questions Answers for Programmers
- 300 Core Java Interview Questions | Set 1
In this post, we will see Java interview questions for 5 to 6 years experience.
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Top 10 Tricky Java interview questions and Answers
Great questions, How about adding tricky questions related to programming exercise? One of the most tricky questions, I have face in a Java interview was, Does two object will always be equal, when there compareTo method returns zero?
I said, Yes, but that was not true. Though most of the classes will be equal if there compareTo return true e. String, but it's not mandatory. One of the prime example of this is java. BigDecimal class, whose equals method return true if two BigDecimal object is equal in both value and scale e.
This was really tricky, until you had faced similar question previously. In another interview, my friend was asked this question little differently, Can we store BigDecimal class in TreeSet?
While I'm an certain these questions are getting asked, I find it ironic that being able to answer them in no way indicates any ability to be a successful programmer. That is why they are trick questions I guess. Good work done!
It will definitely help me in my interviews Hi , I am able to override public static method declared in base class in its subclass.
It didn't throw any compilation or runtime exception. It won't because compiler will treat it as different method. This is called method hiding and its indeed one of the tricky Java question. Remember that this method is not overriding super class method as static method bonded using type information.
That's the reason this Java question is tricky. One of the tricky Java question I faced is "What is difference between Collection and Generics in Java", its not tricky because I don't know either collection or Generics but How can you compare Generics with Collection?
Hi Is the line in codes correct. It's one of ur question. Can you access non static variable in static context? Another tricky Java question from Java fundamentals. Read why you can not access non-static variable from static method to learn more about this tricky Java questions. Hi Ankur, Thanks for pointing out, you should read opposite i. This always confuse if you don't remember it and that's why its one of the tricky question. Hi This line is not correct.
These are definitely a good set of tricky questions that a candidate may face during an interview. I certainly enjoyed going through them but I have a different opinion regarding the last question: Can you access non static variable in static context? I think the answer to that question is a YES albeit one should note that you need an object reference of the associated class to access the variable I assume this variable is an instance variable.
And likewise you can directly access a static variable in non static context too. The explanation of the last question is little bit confusing. Actually static variables are always accessible in non static context however the reverse is not true. In static context, you can access non-static variables - by creating a new instance of the object. Hence the reverse is partly true. I should also mention that you shouldn't cast to Employee without knowing it's an Employee via instanceof, or just using Comparable generic interface.
Before calling System. Onces system. I was asked during an interview the difference between "arraylist" and "linkedlist" and when I should use them Also, found a site where you can give online Java mock interviews.
Its www. LinkedList uses more memory, because, apart from values, it stores a reference to the previous and next entry. What is so tricky about these question, to me they look most simplest question, which doesn't even qualify for Interviews.
Tricky questions are those, who challenge your notion e. When Singleton doesn't remain Singleton in Java? Why compareTo should be consistent to equals method in Java? Hi, Good collection of tricky questions, However I feel that the questions in the interview becomes tricky because we need to answer the same as what interviewer in thinking is correct, this is the most tricky part.
It is always better to clarify the question correctly by rephrasing it. Some trickier questions. How about; 3a how does "has before" apply to volatile work? You can do this BTW Good answers to some common questions, I look forward to some trickier questions.
I would add : What happens when exception is thrown in a Thread? Difference between notify and notifyAll call? Difference between System. Is there a System. I think it is Runtime. Thanks for sharing these. I need some good Java interview questions and a few of these might help me out. No problem Tom, thanks for dropping by, If you have not read already, you may find my article about 10 Questions to make Programming Interview Less Costly useful as well.
Answer to the question "is it possible to load a class by two ClassLoader? This is one more reason why you should use instanceof instead of getClass while overriding equals mehtod, otherwise equals will return false even if object are same but classloader is different.
About Q2: What will happen if you put return statement or System. Will finally block execute? If yes, what do you think it will produce on console as output?
Compile it and run it. Result: no compilation errors, just one warning. It will print infinitely the string "JavaSucks" Pass by value and pass by reference is also a good tricky Java question.
Btw, Java is always pass by value, even for objects its pass by value, its just that reference or handle to the object is passed. We declare constructor as private if we want to implement singleton pattern. Also, If you want to create only 1 instance of your custom class then you can use private constructor.
Please,write me if I am missing anything. Hi Sandeep, Yes, you can declare a private constructor in Java. You can do to prevent instantiation of class outside the class, for example, Singleton pattern is one of the prime examples of the private constructor.
In Singleton, the class itself is responsible for creating the instance and managing it so constructor is made private. A fiend who is a really good programmer was given some of these in an interview a few months ago. His response was: "I'd fire who every wrote such lousy code. I never have to worry about such things, because I write defensive and don't allow such nonsense in my code base" He didn't get the job, but he's right.
Most of this "trick" questions are are just academic and should never occur to in real life. It's lousy people think these type of questions some how gauge the productivity and ability of a programmer who avoids such pitfalls to begin with and hence doesn't know the answers to the way out of them. I have asked this question to my friends having 5 and 6 years of experience and my technical lead having 10 years of experience Java, but they couldn't provide me good answer.
All they could say is, since some floating point numbers cannot be represented precisely in Java, hence 0. I think in practice questions "How does "has before" apply to volatile work? I remember reading about it on Java concurrency in Practice, which says that a volatile write will happen before volatile read. I have recently shared few more Java interview questions especially for developer with 1 to 4 years of experience, you can see it here.
Is null key allowed to stored in HashMap? If yes, how it is handled? What will happen if two different HashMap key objects have same hashcode? This blog awesome and i learn a lot about programming from here. The best thing about this blog is that you doing from beginning to experts level. Love from.
No way to gauge a good programmer from a bad one. Overriding static methods is called as method hiding. In method hiding method resolution is always based on reference type so it will print Collection.
It will print "Collection" because methods are static and so they are bonded during compile time and at that time only type information is available because object is created at runtime.
Honestly, these questions are poor indicators of how effective they will be on the job. They may be entertaining, but they are really bad questions when screening job candidates for real work. On the job you want people who are creative, capable of exploring available options, and capable of executing well on the tasks that they are assigned to them, large or small. These sort of "gotcha" questions do not actually tell you if they are good developers - just whether they have "happened" to stumbled upon obscure facts or details in their careers or have spend an inordinate amount of time reading java docs.
Java interview questions for 5 years experience
Core Java interview questions help you in preparing for java based interviews. Core Java is the favorite area in most of the interviews and plays a crucial role in deciding the outcome of your interview. Java 14 has been released recently and I have updated the post to include some of the questions from the latest releases. I have already written a lot about java interview questions for specific topics such as String, Collections, and Multithreading. Here I am providing some of the important core java interview questions with answers that you should know. You can bookmark this post to brush up your knowledge before heading for an interview.
Thanks a lot Anonymous for informing us about subtle details about Substring method , I guess Interviewer was looking for that information in his question "How does substring inside String works? Hi Scott, your solution is correct but with the advent of java 5 and now guarantee of volatile keyword and change in Java memory model guarantees that double checking of singleton will work. Hi Anand, Thanks for answering question "How does substring inside String works? Use can use a static holder to handle the singleton creation instead of double checked mechanism. Stored Procedure Error: One way to signal an error is from what is returned. Consider different factories each extended from an Abstract Factory and responsible for creation of different hierarchies of objects based on the type of factory. Each individual factory would be responsible for creation of objects in that genre.
Polymorphism is the ability of an object to take on many forms. The most common use of polymorphism in OOP occurs when a parent class reference is used to.
Top 10 Tough Core Java Interview Questions Answers for Programmers
There is the list of core Java interview questions. If there is any core Java interview question that has been asked to you, kindly post it in the ask question section. The answers to the Core Java interview questions are short and to the point.
The main distinction between fail-fast and fail-safe iterators is whether or not the collection can be modified while it is being iterated. Fail-safe iterators allow this; fail-fast iterators do not. Fail-fast iterators operate directly on the collection itself. During iteration, fail-fast iterators fail as soon as they realize that the collection has been modified i. Fail-safe iterates operate on a cloned copy of the collection and therefore do not throw an exception if the collection is modified during iteration.
So here are my lists of 10 most tricky questions in java interview mostly asked to senior and experience Java programmer from 4 to 6 years of experience on finance domain.
300 Core Java Interview Questions | Set 1
Download PDF We have compiled the most frequently asked Java Interview Questions and Answers that will help you prepare for the Basic Java interview questions that an interviewer might ask you during your interview. In this list of Basic Java interview questions, we have covered all commonly asked basic and advanced Core Java interview questions with detailed answers to help you clear the job interview. The following list contains important Core Java interview questions for freshers as well as Java interview questions and answers for experienced programmers to help them prepare for the interview. This detailed guide of interview questions for Java Programming will help you to crack your Job interview easily.
Very very good compilation of all good questions.. Wish me luck for my interviews.. Most of the tough questions I faced on programming interviews are from Data Structure and algorithm. Only difficulty arise on complex Java topics like classloaders, socket programming and multithreading. Since, no body ask question from Swing or AWT, those are useless topics to prepare for Java interviews. I conduct a lot of Java interviews, and I wouldn't ask more than one or two of these questions.
Трудно даже поверить, подумал Беккер, что после всех выпавших на его долю злоключений он вернулся туда, откуда начал поиски. Чего же он ждет. Он засмеялся. Ведь пилот может радировать Стратмору. Усмехнувшись, Беккер еще раз посмотрелся в зеркало и поправил узел галстука. Он уже собрался идти, как что-то в зеркале бросилось ему в. Он повернулся: из полуоткрытой двери в кабинку торчала сумка Меган.
10 Tricky Java interview question - Answered · 1. Question: What does the following Java program print? · 2. What will happen if you put the return statement or.
А что с кольцом? - спросил он как можно более безразличным тоном. - Лейтенант рассказал вам про кольцо? - удивился Клушар, - Рассказал. - Что вы говорите! - Старик был искренне изумлен. - Я не думал, что он мне поверил.
Он схватился руками за боковые стороны проема и, одним движением вбросив свое тело внутрь, тяжело рухнул на лестницу. Халохот услышал, как где-то ниже тело Беккера упало на каменные ступеньки, и бросился вниз, сжимая в руке пистолет. В поле его зрения попало окно.
Колеса неистово вращались на рыхлой земле. Маломощный двигатель отчаянно выл, стараясь одолеть подъем. Беккер выжал из него все, что мог, и отчаянно боялся, что мотоцикл заглохнет в любую минуту. Нельзя было даже оглянуться: такси остановится в любой момент и снова начнется стрельба. Однако выстрелов не последовало.
- Уже обо всем пронюхали.