java full stack developer interview questions and answers pdf

Full Stack Developer Interview Questions | Web Development Interview Questions | Simplilearn

Most Frequently Asked Full stack interview questions

Here in this article, we will be listing frequently asked Full stack interview questions and Answers with the belief that they will be helpful for you to gain higher marks. Also, to let you know that this article has been written under the guidance of industry professionals and covered all the current competencies.

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S.no GET POST
1. GET is used for recovering the data POST is mainly used for writing the data
2. It carries the request parameter in the URL string It takes the request parameter in the message body.
3. It can be bookmarked It cannot be bookmarked

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Abstract Interfaces
Abstract classes cannot be implemented. The Interfaces needs to be implemented.
They are models which can have some methods to be used by all the inherited children. It is a contract, where the receiver is asking a specific type of input and sender agrees to send it that way.
Abstract classes can have private methods. Interfaces can not have private methods. All the plans are public.

A full stack developer should know:-

Must be proficient in multiple languages, including PHP, Java, C #, Ruby, Perl, Python, etc. Must be familiar with different ways to structure, design, implement and test the project based on languages.

Must know the words that are accompanied by development frameworks, such as Spring, JAVA, MyBatis, Python Django, PHP think PHP, Hibernate, nodeJs express, yin, etc.

Must master necessary front-end technologies such as CSS3, HTML5, and JavaScript. Additional study of third-party libraries such as JQuery, SASS, LESS, AngularJS, or REACT is also required.

Knowledge of at least one database is expected. Currently, the popular databases are MySQL, Oracle, MongoDB, SQLServer and Redis.

Basic knowledge of the principle of prototype design, UI and UX design is needed. Is this helpful? Yes No

A RESTful API is also known as RESTful web service. Full form of REST is Representational state transfer, and complete kind of API is Application program interface. This program interface uses HTTP protocol to define the set of function such as GET, PUT, POST and DELETE data. RESTful API is used.

REST is mostly used in developing Web applications. Is this helpful? Yes No

A Callback Function is a function which is passed as a parameter to another function,.The callback function run inside of the function into which it was passed. JavaScript Callback Functions can be used synchronously, and it can also be used asynchronously. Application programming interfaces of the Node are written in such a way that they all support callbacks. Is this helpful? Yes No

HTML 5 has “data-*” which are custom attributes defined by the developer. They are used when any existing characteristic is not suitable to be used. These attributes are only used on the page they are written on, and they do not need AJAX calls.

These are Global attributes, so they can be applied to any element.

Point to be noted: Go through this Q&A very thoroughly as this is one of the essential full stack developer interview questions. Is this helpful? Yes No

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S.no MVP MVC
1. View handles the user gestures The controller manages the user gestures
2. The interaction with the model is passed through the presenter The view can query the model directly
3. Provides full sport to unit testing Provides limited support to unit testing

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S.no defer async
1. It downloads the file during the HTML parsing but executes the data after the parsing is completed. It downloads the data during the HTML parsing, but it stops the parsing from executing the downloaded file.
2. Defer is used when the script relies upon another script. Async is used if the script does not rely upon any scripts.

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S.no resetting normalizing
1. Resetting removes all the built-in browser styling. Normalizing makes the integrated browser styling consistent across the browsers.
2. It does not provide bug fixes. It includes bug fixes.

The acronym ACID stands for Atomicity, Consistency, Isolation, and Durability. Is this helpful? Yes No

S.no LEFT JOIN RIGHT JOIN
1. It gets the records from the rows of the LEFT side linked table and only the matching records from the RIGHT table. It gets the records from the rows of the RIGHT side linked table and only the matching records from the LEFT table.

Normalization means merely a process of reducing or eliminating the data redundancy. As a result, space is saved, and the consistency of data is increased.

The denormalization is an optimization process to increase the data redundancy in the database. As a result, the joins are avoided, and the performance of the database structure is improved. Denormalization is done after the normalization process Is this helpful? Yes No

Two-phase Commit (2PC) is the feature of transaction processing systems which enables databases that they return to the pre-transaction state if an error condition occurs. The two-phase commit strategy is designed to make sure that either all the databases are updated or none of them is updated. As a result, the databases remain synchronized. Is this helpful? Yes No

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S.no Horizontal scaling Vertical scaling
1. More machines are added into your existing resources More power i.e. CPU, RAM is attached to the current machine
2. Horizontal scaling there is no limit Vertical scaling depends on the capacity of the machine
3. Licensing fees is more Licensing fees is less
S.no == ===
1. If the variables are not of the same types, then it converts one variable type to another and performs the operation If the variables are not of the same type, then it will not achieve the process and will return false

Note: The following Full Stack Developer interview questions are a guide to a basic understanding of the subject. Must read for Engineers switching to Full-Stack. Is this helpful? Yes No

Event Bubbling and Event Capturing are the ways of the event propagation in the HTML API when an event occurs in an element which is located inside the other part and both the parts have registered a handle with the recently happened event. Here the event propagation mode identifies that in which order the elements receive the event.

In the case of Event Bubbling, the event is first captured and also handled by the innermost element, and then the event is propagated to the outermost element.

In the case of Event Capturing, the event is first captured and also handled by the outermost element, and then the event is propagated to the innermost element. Is this helpful? Yes No

A Promise is an object which shows the result of the asynchronous operation. The result can be a resolved value or a reason why the process failed like “a network error occurred.

  • Pending – the promise’s result hasn’t yet been identified because the asynchronous operation has not been completed yet.
  • Fulfilled – the asynchronous operation has completed, and the promise has now a resolved value.
  • Rejected – the asynchronous operation has failed, and the promise has a reason that indicates why the process failed.
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    Prototypes are objects created in Javascript. They are the “parent” objects. If we want to create common tasks (properties/methods) for all the objects inherited from the parent object we need to define them in the prototype object. Is this helpful? Yes No

    A closure is the capability of an inner function to have access to variables in local scope in which internal function was created. Even if the out function has finished execution, closure means the inner function has access to its local variables. Is this helpful? Yes No

    Final classes cannot be subclassed; it is not open for change and can be used reliably for common execution of routines. “String” class in Java is an example of a final class. This is done for security and sometimes for efficiency.

    Final methods cannot be overridden. They are not open to change. This prevents accidental changes which may result in crashing of application. Is this helpful? Yes No

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    S.no Constructor Destructor
    1. It allocates the memory to an object. It deallocates the memory of an object.
    2. It accepts argument. It does not take an argument.
    3. In a class, there can be multiple constructors. In a class, there can only be one destructor.

    Express.js is a web application server framework. It is used for Node.js. It helps to create node.js applications in less time. It also provides security-related help for node.js. Is this helpful? Yes No

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    S.no AngularJS Node.js
    1. Written only in Javascript. Written in Javascript, C, C++.
    2. It is a client-side web application It is a server-side web application
    3. It is a web application framework in itself It is not a framework but has a framework like express.js

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    S.no Node.js AJAX JQuery
    1. It allows JavaScript to be run without a browser It a way for JavaScript to request the data from a server but without refreshing the page or blocking the application. It is a JavaScript library which was built to automate and simplify the common web tasks like AJAX

    MEAN stack is a user-friendly free and open-source JavaScript software which is used for building the dynamic web sites and the web applications. The advantage of using the MEAN stack is that only language JavaScript runs on all the levels of the applications which makes it efficient.

  • MongoDB as the database
  • Express.js as the web framework which runs on Node.js
  • AngularJS as the frontend framework
  • Node.js as the server platform.
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    If the developer wants to go through different pages in a single page application and also with no reloading of the page then the ngRoute module is used. It routes the application to different pages with the reloading of the complete application. Is this helpful? Yes No

    S.no Directive Component
    1. It is a behavior that has been added to the existing components. Components have their own view i.e., HTML and styles.
    2. There can be multiple directives in one element. There can be only one component in one element.

    Note: These are Full Stack developer interview questions. Candidates who are deciding to switch to Full Stack or looking for a job must read this. Is this helpful? Yes No

    Multithreading is the ability of the Operating system or the program to handle the multiple user requests at a time for its resources. Here a user can be a human or another program. Is this helpful? Yes No

    CORS stands for Cross-Origin Resource Sharing. It is a standard to share the selected resources between the web applications running on two different domains. Is this helpful? Yes No

    The ways to minimize the load time of a web application are:-

  • Minimize the resources requested by a page
  • Implement Lazy load so that the part of the page only loads when the access that part.
  • Use Distributed networks for common resource files.
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    A connection leak implies a portion of the information base request/transaction are not getting shut as expected or are not getting committed. Lastly, those connections are getting abandoned and shut down all time.

    To fix the leaks, you have to find where you have used the opening connections and then use try-with-resources that will do all the close() stuff for you.

    A deadlock can appear almost when the processes share the resources. To detect the deadlock, the wait-for graph should be maintained, and the system invokes an algorithm periodically that searches for cycles in the wait-for graph.

  • Avoid nested locks: The main reason for the deadlock is giving locks to multiple threads. You should avoid giving the locks to multiple threads when you have already given them to one.
  • Avoiding unnecessary locks: We can lock only the required members. To have a lock unnecessarily can lead to a deadlock.
  • Use Thread. Join (): Deadlock condition appears when one Thread is waiting for another to finish. In case this condition arises, we can use the Thread. Join () with the maximum time the execution will take.
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    There are generally four main methods of session management in Servlet.

  • URL rewriting
  • Cookies
  • HTTPS and SSL
  • Hidden Form Fields
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    Spring MVC Framework provides two ways for handling the exceptions:

  • Using XML configuration: this configuration is similar to the exception handling in Servlet/JSP, by calling a SimpleMappingExceptionResolver bean in the context file of Springs application and the type of map execution with the view names. This approach simply applies to all the controllers in the application.
  • Using exception handler method: The annotation type “@ExceptionHandler” provided by Spring is being used to annotate the method to handle the exceptions raised by the controllers methods. This approach applies to only the controllers in the application where the handler method is declared.
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    The static method cant be overridden in Java. This is because the overriding method depends upon the runtime dynamic binding, whereas the static methods are bonded statically at the compile time. Also, the static method is not linked with any of the class instances, so the concept is not applicable. Is this helpful? Yes No

    Constructor injection is better.

    If you want to prompt the class, you always do it with the constructor. When you are using the constructor-based injection, the only way to prompt or instantiate the class is by using the constructor. If you pass the dependency via a constructor, it becomes obvious that it is an essential dependency.

    However, if you use the setter injection in the POJO class, you might face challenges in setting the value of your class variable by using the setter method. This is entirely based on the customers needs which is optional. If you pass the dependency via setter, it means that it is an optional dependency. Is this helpful? Yes No

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    Errors Exceptions
    The type of error in Java is Java. Lang.Error. The type of exception in Java is Java. Lang.Exception.
    The type of all the errors in Java is unchecked. Exceptions include both checked and unchecked types.
    It is impossible to recover from errors. You can recover from exceptions by handling them via try-catch blocks.
    The reason for causing the errors are the environment where the application is running. The application itself causes exceptions.

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    Basis Boxing Unboxing
    Basic The object type refers to its value type. It is the process of fetching value from the boxed object.
    Storage The value stored on the stack is copied to the object stored on the heap memory. The value of the object stored on the heap memory is copied to the value type stored on the stack.
    Conversion Implicit Explicit
    Example Int n = 24; Object ob = n; Int m = (int) ob;

    The overloading method is used in Java when two or more methods share the same name in the same class but with different parameters.

    class Dog{ public void bark(){ System.out.println("woof "); } //overloading method public void bark(int num){ for(int i=0; i < num; i++) { System.out.println("woof "); } } }

    The overriding method defines the case where the childs class redefines the same method as their parent class. The overridden methods should have the same argument list, name, and return type.

    class Dog{ public void bark(){ System.out.println("woof "); } } class Hound extends Dog{ public void sniff(){ System.out.println("sniff "); } public void bark(){ System.out.println("bowl"); } }

    public class OverridingTest{ public static void main(String [] args){ Dog dog = new Hound(); dog.bark(); } } Is this helpful? Yes No

    Garbage collection makes Java more memory efficient by simply removing the objects which are not referenced to anything from the heap memory and creating the free space for the new objects. Is this helpful? Yes No

    The doGet() method is used to fetch the information from the server, whereas the doPost() is used to send or transfer the information to the server.

    doGet() method is labelled by the servlet service method, which is used to handle the HTTP GET request. In case of overriding this method, ensure to read the requested data and then write the response headers. Once you get the output stream object or the responses writer, only then write the response data.

    doPost() method is labelled by the servlet service method to manage the POST request from the client. This method sends the files to the server and works similarly to the FTP operations from the client to the server. Is this helpful? Yes No

    Frequently Asked Full Stack Developer Interview Questions

    If you want to enrich your career and become a professional in Full Stack Developer, then enroll in "Full Stack Developer Training" - This course will help you to achieve excellence in this domain.

    14. What’s the difference between Full Stack Engineer and Full Stack Developer?

    A Full-Stack engineer is someone with a senior-level role with the experience of a Full Stack developer, but with project management experience in system administration (configuring and managing computer networks and systems).

    Polling is a method by which a client asks the server for new data frequently. Polling can be done in two ways: Long polling and Short Polling.

  • Long polling is a development pattern that surpasses data from server to client with no delay.
  • Short polling calls at fixed delays and is based AJAX-based.
  • FAQ

    How do I prepare for a full stack interview?

    Full Stack Developer Interview Questions
    • To develop a project from scratch, what technologies and languages would you need or what skills a full stack developer should have?
    • Which language is the most preferred by full-stack developers?
    • Explain Pair Programming.
    • What do you mean by CORS (Cross-Origin Resource Sharing)?

    What should a full stack Java developer know?

    As a full stack developer, you should be adept at front-end development that uses Java, JavaScript, and HTML. The knowledge of the Ruby program is also desirable. In addition, in-depth knowledge of palindrome functions and data structures will ensure you go a long way in the interview process.

    Is Java used in full stack developer?

    Top 9 Skills Required For Java Full Stack Developer
    • JavaScript: Given that it brings the ease of excellent website creation to full-stack developers, JavaScript t is the ultimate tool. ...
    • HTML / CSS: ...
    • Git & GitHub: ...
    • Backend Languages: ...
    • Databases & Web Storage: ...
    • Spring Frameworks: ...
    • DevOps Tools: ...
    • Web Architecture:

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