Javin Paul

Hello Robert, both of them are valid suggestions, and one way or another they are also included in this article. For example, the rule which says that "Encapsulate what changes" is exactly to hide your data. I really like your second suggestion because if there is a single rule to follow it must be good names for variable, methods, and classes

I think you are right. My first introduction with Uncle Bob was with Clean Code, that was remarkable but this book is at par of that.

I think you are right. My first introduction with Uncle Bob was with Clean Code, that was remarkable but this book is at par of that.

Yes :-)

Yup, that's a great book and updated version of Java 8 in Action.

You seems to die-hard Scala fan :-)

Do you mean even Effective Java?

yeah, agree, I need to add few more Java 8 questions on this list. thanks for feedback.

Not really, it can be tough for beginners but yes if you have decent Java experience, you should know all the answers.

Not in this era of DevOps. But again, the choice is yours. Tools like Puppet or Chef are good for infra automation and help you to quickly build your evnvironemtn reliably, consistently and easily. .

If you want to learn just one, choose Maven. Even Gradle is better and latest, Maven is still most widely used.

It's a good tool but you can ignore if you are no interested on monitroring and your organization is not investing on that.

Well, my take was that a developer who knows better tools and knows his tools better is a better developer than others. But, yes, that's my take on this quote and that's why I love to learn tools which help in development, testing etc.

That's true but it's not the easiest book out there because topic itself is complex. A course will help you better.

Yes, these are also good resources. Thanks for sharing them here.

Thanks

I think the most important reason is the power of language and how easy it is to learn or do something on it. By power I mean, what can you do using that language without breaking stones and Python is great on that. It offers tons of library for doing virtually anything.

If you need an easier book on Algorithms then try Grokking Algorithms by Aditya Bhargava

Thanks for pointing guys, the missing link is http://www.java67.com/2018/02/5-free-react-courses-for-web-developers.html

you are most welcome Henry.

Indeed.

Beginning Scala Programming

Scala and Functional Programming for Beginners

Read more: https://javarevisited.blogspot.com/2018/01/10-reasons-to-learn-scala-programming.html#ixzz5Y3sQZHIN

Thanks Josh.

Thanks

Not really, if someone has mugged how to reverse a singly linked list, he will fail as soon as you change the problem a little bit e.g. asking to use recursion or iteration or in place or just asking to reverse in pairs. These are good questions because you can do in a few lines if you are a good developer, shows the problem-solving skill of candidate, and also allows the interviewer to increase difficulty level slowly.

Well, you always need a bit of brush up and practice before going into an interview.

Thanks Calvin

Yes, that's again a great book and I could have included in this list but I left it as a general programming best practices book.

Modern Java in Action is the updated version of Manning's Java 8 in Action and contains changes from Java 9 and 10. I, agree on a good book to add to this list, but now that you have mentioned, people can take note of that.

While I agree that Scala and Haskel are very good programming language but they are not for average developers, otherwise it would have grown like Python or JavaScript. There is a reason why Java, Python, and JavaScript is ruling the world, they all are accepted by the mass. That acceptance is very important.

But, In most organization it doesn't work like that, you have to wear many hats at the same time.

Why Serge? I think Java, Python, and JavaScript is the only three language which is going great at the moment.

I think you can use jConsole to check deadlock in realtime.

yes, by using this coding technique you can avoid deadlock.

Hello Gautam, Yes, there are many useful machine learning libraries in Java like Weka and Deeplearning4j but most of the development is happening in Python and R where libraries like TensorFlow, Sci-kit, Keras, and Pandas are very active and popular.

Definitely Log4j2 is faster but still abstracting your logging library by using SLF4j is not a bad option.

Yes, Spock is a good framework but you need to know Groovy, which is also not bad if you can.

not the best, but yes, good books.

Hello Phil, I haven't read that yet but looks a good book to learn JavaFX, thanks for the suggestion.

Thanks, that's a good book.

This is just a blanket comment without any argument. Though I agree, it's opinionated, it makes smart choices and also gives you the tool to customize it.

I second, unit testing/automation/integration testing is the single most important thing for Java developers. There is a lot to learn on that space.

yup, that's bad, but I mean books simply denote it's Book, yes there will be some situation where it's not clear and in that case, as you said, Stream<Book> will make sense.

Hello Kevin, I agree but most of the time name of the variable and type provide same information e.g. Books book = new Book() or Book book = getBook().;

Now that type is gone, the variable name becomes even more important because it has to indicate type as well.

Yup, you are correct. In some cases, though Enum as Singleton is also an easier option.

That's not true.

Thanks Gunnar, that's very useful feedback and pinpoint the problem. I wrote this article keeping new developers and fresh computer science graduate in mind but then again I erred on SVN part. Though, I would be more than interested in what would have been your list, what tools or skills would you have liked to see on software developers?

I have to agree with you on this point, the Cobol example just killed the argument.

Hello Gunnar, Software development is not just about writing code, it's much more than that. You need to get requirements, document them, develop, code, test, support and even educate people. Giving a presentation, creating diagrams to explain your system all are part of Software developer's day to day job. Though I agree that you might not have used PPT, you might have used any other tool e.g. Visio to create diagrams etc. The whole point is to have a tool which lets you do that and PPT is most commonly available.

Well, Confluence is good for documentation, I have hardly seen any software requirement document written over there.

Thanks for that, I know, SVN is dying and Git is going to take over all but in the real world, there are still a lot of projects which use SVN and that's why it's an important tool to learn.

Sorry, Guillermo that you are disappointed, but you clarify what was your expectation when you read the title? I use these tools daily and they are essential for any programmers, I don't really know why so many negative comments.

That's not true, these are excellent tools and I used them daily, don't you use Git or SQL or Linux commands? But, there is something which I missed because it generates same comments all over the internet, not just on Dzone but on Reddit as well. Is that title?

Sorry, but can you clarify. These are the tools I used daily and they are useful, not sure why this article is sparking so many negative comments.

Well, I have mentioned Linux commands but yes they are awesome tools

Not really, if you also write requirement specification as part of your development, you need to know the MS Word. same goes for PPT.

Well, kind of yes, particularly for this example, but we don't always use Arrays.asList(), especially if arguments are not String and Integer.

Thanks, Jim, some nice thoughts there. You also have point with programmer should not start with Android development but I have seen a trend that the Idea of developing apps are bringing many people to programming. but yes, they would do better to follow your advice.

Hello Mark, You may be right but the opportunity Java provides is unparalleled and Kotlin has a long way to catch that. Also learning Java is quite easy, though that's subjective and some people may find Kotlin easier to Java.

Hello Lee, I mean brand new developers that don't know how to code. If you already know Groovy/Grails and doing web development, you can start with kotlin. In fact, your Groovy knowledge will help you to learn Kotlin faster.

Hello Craig, Effective Java 3rd edition should be the first book, I didn't include on the list but I mention it specifically because I think it's must read for all developers.

Thanks Thai, yes doing every toy project in the language you want to learn is a great idea. I am thinking to write a file recon tool in Scala for one of my project, let's see how it goes.

I am almost done with Effective Java 3rd Edition :-) but High-performance in-memory computing with Apache Ignite seems interesting. Thanks for suggesting that.

When you have mutable object e.g. Date, you must return a copy of it instead of original reference. One of the thing people miss while creating an immutable class in Java.

Well, Certifications are globally recognized and definitely provide value in terms of Job and credibility. I am not saying that you definitely need certification to get the job but it adds value. Also, apart from recognition, it boosts your knowledge and makes you expert which indirectly help to do well on interview and day to day job.

Thanks for sharing your experience. Here are my 5 tips to prepare well for Java certification Exam

1. Code Dailly
2. Good Study Book
3. Good Exam Simulators e.g. Whizlabs
4. Forums e.g. CodeRanch
5. Solve Practice Questions e.g. free 1Z0-808 mocks

Good post man you have covered the topic well. despite being fact WeakHashMap is good for garbage collection and allows reference to be garbage collected when they are only in cache its not yet gain popularity and most of the poepe are still not aware of this beautiful concept.

Thanks
Javin
How HashMap works in Java

I think its not that Java doesn't need it , we have seen many example where operator overloading can make code more readable and fits naturally. but in my opinion Why Java doesn't support operator overloading because if you allow programmer to do operator overloading they will come up with multiple meanings for same operator which will make the learning curve of any developer hard and things more confusing and messing. Its been observed that there is increase in programming errors when language supports operator overloading which in turn increase the development and delivery time and since Java and JVM has taken most of developers responsibility in memory management by proving garbage collector it doesn't really make sense to left this feature to pollute the code and a loop hole for programming errors.

Thanks
Javin
How HashMap works in Java

I think its not that Java doesn't need it , we have seen many example where operator overloading can make code more readable and fits naturally. but in my opinion Why Java doesn't support operator overloading because if you allow programmer to do operator overloading they will come up with multiple meanings for same operator which will make the learning curve of any developer hard and things more confusing and messing. Its been observed that there is increase in programming errors when language supports operator overloading which in turn increase the development and delivery time and since Java and JVM has taken most of developers responsibility in memory management by proving garbage collector it doesn't really make sense to left this feature to pollute the code and a loop hole for programming errors.

Thanks
Javin
How HashMap works in Java

simply amazing , would have been much better if you could share experience how to deal with those day 2 day issue, that will really help many people or probably write how to effectively deal with your project manager etc

Thanks
10 example of find command in Unix

This is just amazing but every IDE provides your code feature to automatically creat getter, setter, equal, hashcode and toString method.

Thanks
How HashMap works in Java

In my opinion its a usecase or scenario which decides what to use obviously if you have just one reader and one writer, synchronized is the best choice because of clean and simple approach while in case of multiple Reader and Single writer , Lock interface can provide much better performance.

Thanks
Javin
20 points about synchronization in Java

In my opinion its a usecase or scenario which decides what to use obviously if you have just one reader and one writer, synchronized is the best choice because of clean and simple approach while in case of multiple Reader and Single writer , Lock interface can provide much better performance.

Thanks
Javin
20 points about synchronization in Java

This one is new "-XX:+UseCompressedStrings" I was not aware of that though in most project I found String as major source of garbage and reducing string garbage and turing GC parameter to have fewer mjaor collection improves performance signifcantly.

Javin
How Garbage collection works in Java

I must say great post , never know these details about generic. Thank a lot for bringing these to us.

Javin
How volatile keyword works in Java with example

>One can also use Void class in Generics to specify that you don't care about the specific type of object being used.

Anyone please Why do some one wants to do this , if type-saftey is not requirement then one can use collection class without generics ?? what do yo say

but this could be a interesting interview questions :)

Javin
Top 20 Core Java Interview question answers

>One can also use Void class in Generics to specify that you don't care about the specific type of object being used.

Anyone please Why do some one wants to do this , if type-saftey is not requirement then one can use collection class without generics ?? what do yo say

but this could be a interesting interview questions :)

Javin
Top 20 Core Java Interview question answers

I think JCP should be held responsible for being community. The fact that the Java community Process claims to be open but does not keep this promise affecting its image and people are losing trust over it It's a sad that the technology is moviing faster than the process itself.

Thanks
How HashMap in Java works

Something to add:

1) Never allocate more than 70% of physical memory as JVM heap size instead of helping it acutally slows down and might create some more problem.

2) If you are running in 32 bit Machine I don't think more than 4GB can be allocated to single process , gurus correct me If I wrong , so beware of this anyway I think JVM itself will not be able to start if you give more than what he can accept.

3) do not forget to add "M" or "G" after specifiying JVM memory parameter e.g. -XMs 2G

I have also blogged on java heap as 10 point about Heap space in Java , see if it helps.

great example. I have also read somewhere that by using Reentrant lock we can control Reader and Writer and can build cache which allows multiple concurrent read and block only write operation , something which is not possible with synchronized keyword in java which blocks both reader and writer mutual exclusively. I have also blogged some of my synchronization experience as How Synchronization works in Java , you may find useful.

based on my experience these quick fix lets to introduce big problem because what initally appear as quick fix just solves a face of problem and most of the time not well thought so leads to some other problem , I would suggest to think 4 times with 4 people before putting any quick fix.

Javin
How Classpath works in Java

Couldn't be agree more than this, without proper tool no language can survive. There are lots of example presents around like scala, and many other new JVM language but nothing is as popular and widely used as Java Why because java is established and lots of tools , resources and programmer community is available in Java , so even if a new language provides one or two benefit it won't be able to replace existing big like Java, C++ , C and Perl.

Javin
Top 20 Core Java Interview question

Interesting article , Thanks for all those related links , I really like Erik Petterson post . I think until you find your job interesting it would be hard to spend time, most of the developer I met they spent countless hours on learning and exploring technologies , reading blogs , reading articles etc. those are kind of interest you need in yourself to keep the passion going .

Javin
10 example of using find command in Unix

Agree with Ran, log4j does samething by using watchdog thread which monitors on change in log4j.xml but I think JMX is more flexible way of doing it , with indroduction of MX4j you can have JMX page open on your browser and can easily change logging level without restarting system. you can also put authentication on JMX page to avoid any unauthorized access.

Javin
10 tips on logging in Java

Nice article but the best book I found on this topic is HFDP in there first or second chapter they have explained this topic beautifully and once you read that you won't forget for life. Indeed Composition is lot better than inheritence because it provides you runtime flexibility to change behavior of a class which Inheritance can not, code written using composition was more manageable than inheritance.

Javin
How HashMap works in Java

I read this article on your blog earlier , great article as I said earlier and something evey application developer dealing with database should aware of ,posting it on Dzone increased its value more , good work sandeep , keep it up man.

Javin
10 basic mysql commands to remember

Excellent stuff man , you indeed covered the topic in details with some really good example. design pattern is little complex topic until you understand where to use and where not use and how to use it. I would prefer to give some don't also i.e. where not to use this pattern and also what is benefit of using it how it helps in maintenance etc. e.g Factory pattern helps a lot if you want to create new object because you only need to make change on Factory class ,why because Factory encapsulates logic of creating object , so it require to change in one class which means less testing, less chance of error and quick delivery. Anyway great stuff and keep it up.

Javin
Why String is immutable in Java

I am wondering if Java 8 even remain open source , its now Oracle and Oracle is not a big fanof to giving something free or open source , they might ask for license of using Java going forward :)

My ultimate wish is Java remain Opensource as it is now .

Javin
How HashMap works in Java

I am wondering if Java 8 even remain open source , its now Oracle and Oracle is not a big fanof to giving something free or open source , they might ask for license of using Java going forward :)

My ultimate wish is Java remain Opensource as it is now .

Javin
How HashMap works in Java

I am wondering if Java 8 even remain open source , its now Oracle and Oracle is not a big fanof to giving something free or open source , they might ask for license of using Java going forward :)

My ultimate wish is Java remain Opensource as it is now .

Javin
How HashMap works in Java

This looks to me a nice series of tutorial which will really help programmer on programming and developement concept. I see web is full of article but genuine good article related to programming concept, best practices, experiences are really rare. with due course I found that while developing or programming its always better to discard the first way of solution because its most of the time it blocks thinking and contains bugs , think more and then decide. another important skill is think through process which is pretty important for maintennace and new dev.

Javin

Why String is immutable in Java

Thanks a lot for making us aware of this library. A good matrix library can be quite useful for matrix related computation but as with other open source library how much testing has been done on this we are not sure and how good it is to use for production is still a question. I am sure it would get mature and accepted widely by other open source projects but it has long way to go.

Javin

Why String is immutable in Java

Indeed Nice article In my experiece Remote Debugging is very useful for troubleshooting production issues on large enterprise application, specially if your applicaiton is live and you don't have proper development environment setup in your dev box.

Thanks
Javin

Java remote debugging in Eclipse Tips

Indeed Nice article In my experiece Remote Debugging is very useful for troubleshooting production issues on large enterprise application, specially if your applicaiton is live and you don't have proper development environment setup in your dev box.

Thanks
Javin

Java remote debugging in Eclipse Tips

Indeed Nice article In my experiece Remote Debugging is very useful for troubleshooting production issues on large enterprise application, specially if your applicaiton is live and you don't have proper development environment setup in your dev box.

Thanks
Javin

Java remote debugging in Eclipse Tips

Indeed Nice article In my experiece Remote Debugging is very useful for troubleshooting production issues on large enterprise application, specially if your applicaiton is live and you don't have proper development environment setup in your dev box.

Thanks
Javin

Java remote debugging in Eclipse Tips

Indeed Nice article In my experiece Remote Debugging is very useful for troubleshooting production issues on large enterprise application, specially if your applicaiton is live and you don't have proper development environment setup in your dev box.

Thanks
Javin

Java remote debugging in Eclipse Tips

Indeed Nice article In my experiece Remote Debugging is very useful for troubleshooting production issues on large enterprise application, specially if your applicaiton is live and you don't have proper development environment setup in your dev box.

Thanks
Javin

Java remote debugging in Eclipse Tips

Indeed Nice article In my experiece Remote Debugging is very useful for troubleshooting production issues on large enterprise application, specially if your applicaiton is live and you don't have proper development environment setup in your dev box.

Thanks
Javin

Java remote debugging in Eclipse Tips

Indeed Nice article In my experiece Remote Debugging is very useful for troubleshooting production issues on large enterprise application, specially if your applicaiton is live and you don't have proper development environment setup in your dev box.

Thanks
Javin

Java remote debugging in Eclipse Tips

Conditional breakpoint is really powerful feature eclipse offered and i have used it a lot during my project particularly useful if you want to stop execution only for a particluar thread or a particular condition. See my blog post Java and eclipse remote deubgging for more debugging tips.

here is my list of Top 20 eclipse keyboard shortcuts I would rather say very useful and practical eclipse shortcut :) and I used it on day to day basis.

here is my list of Top 20 eclipse keyboard shortcuts I would rather say very useful and practical eclipse shortcut :) and I used it on day to day basis.

Hi,

I completely agree your point "JavaScript may look like Java, smell like Java and even taste a little like Java, but it does not behave like Java" . Java is such a gem languare and it gives you pleasure of coding while Javascript is give feels more of scripting than programming. anyway both are important in there place but I must say Java is Java :)

Thanks

Javin