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Q871. How to calculate string length without using inbuilt function

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Q872. Can we use Prototype Bean scope with Autowiring ?

Spring

Ans. Default Bean scope in auto wiring is Singleton but Yes, that can be changed by specifying the Bean scope explicitly.

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Q873. What is the difference between Maven and Jenkins ?

Tools

Ans. Maven is a build tool whereas Jenkins is continuous integration system.

Maven deals with application compilation, build and packaging whereas Jenkins tracks SCM for triggering builds and packages, triggering parent project builds upon dependencies, initiating builds and performing alerts. So Jenkins is kind of a wrapper around SCM and Build Tool for continuous integration and deployment.

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Q874. Please explain with example different types of testing ?

Testing

Ans. Unit Testing ( Junits )
Integration Testing ( Testing overall flow by calling the entry method or by calling the service end point )
Manual Testing ( End to End Manual User Testing, they way eventually it will be used by end users )
Automation Testing ( Machine replication of end to end testing )

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Q875. What version of Maven are you working with ? Are you aware of changes in the most recent version of Maven ?

Maven

Ans. 3.3.9

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Q876. What is the following code doing ?

private static final String[] COLORS = new String[] { "Red", "Green", "Blue" };

Core Java

Ans. We are initializing a static and constant string array named as COLORS using Strings "Red","Green" and "Blue".

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Q877. What is MVC in GUI components ?

Design

Ans. The Model/View/Controller pattern, a strategy for dividing responsibility in a GUI component.

The model is the data for the component.

The view is the visual presentation of the component on the screen.

The controller is responsible for reacting to events by changing the model.

According to the MVC pattern, these responsibilities should be handled by different objects.

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Q878. Write SQL to get all members and the count of books they have checked out , even the ones that haven't checked out anything.

SQL

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Library Management System has always been the favorite question. This questions is asked irrespective of level.

Q879. Write data models and service end points for Library Management System ?

Architecture

Ans. Following could be the business sub domains or database schemas in such a system

1. Users / Members
2. Sourcing
3. Inventory Management
4. Operations

Following services end points could be there

1. Users - addNewUser ( put ), removeUser ( post )
2. Sourcing - addSupplier ( put ), removeSupplier ( post )
3. Inventory Management - getInventory ( get )
4. Operations - checkIn ( post ), checkout ( post )

There could be following Tables in Database

1. Users / Members - MEMBER, MEMBERSHIP_TYPE
2. Sourcing - SUPPLIER, SUPPLIER_PRODUCT, PRODUCT_REORDER_LEVELS
3. Inventory Management - INVENTORY,PRODUCTS
4. Operations - TRANSACTION

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Q880. How do you prefer to resolve team disputes , just talking or in written ?

general

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Q881. What is the Big O notation for Fibonacci series - both iterative as well as recursive ?

Algorithm

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Q882. What is the thing that would turn you off for a company ?

General

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Q883. What value you would like to see in an employee if you own a company ?

General

Ans. The intent of this question is to see what values as a employee you have. So answer this cautiously as they will try to judge you on the basis of this answer.

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Q884. How is the culture at your current company ?

general

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Q885. What are you using AWS lambda for ?

Amazon Web Services (AWS)

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Q886. Do you have any problems with your team that you plan on changing ?

General

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Q887. Have you used Java 8 Lambda expressions ?

Core Java

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Q888. Write a Program to print a pattern ?

Core Java

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Q889. Difference between static and dynamic binding ?

Design

Ans. Static binding happens at the compile time whereas dynamic binding happens at runtime.

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Q890. Which of the following is insertion heavy - HashSet or TreeSet ?

Core Java

Ans. TreeSet as it needs elements in a particular order

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Q891. What is the difference between TreeSet and TreeMap ?

Core Java

Ans. TreeSet contains only values as elements whereas TreeMap contains Key value pairs.

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Q892. Suppose we make an api call using multithreading, How would you design to make sure that we have received response for all threads before exiting the main thread ?

Design

Ans. We can use HashMap for tracking response status for all threads. We can wait every n second by using Thread.sleep and exit the main thread only once we have received response for all threads.

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Q893. How executor service is better than using primitive Threading mechanism using Thread class or runnable Interface ?

Core Java

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Q894. How many bytes a character takes with UTF-8 encoding ?

Encoding

Ans. it takes 1 to 4 bytes

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Q895. How does encoding affect using Reader / writer classes or Stream classes in Java ?

Core Java

Ans. Which group of bytes represent which character is defined by character encoding. So when reading character by character from a stream of bytes using Reader, specifying character encoding becomes significant as the same group of bytes can represent different character in different character encoding(Eg UTF-8 and UTF-16 etc.)

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Q896. In which way are you using dependency injection in Spring ? Annotation , Config or Class ?

Spring

Ans. Possible Answer - We are using config file.

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Q897. What is the doctype declaration at the top of html page ?

Html

Ans. It is an instruction to the web browser about what version of HTML the page is written in, which specifies the rules for the markup language, so that the browsers render the content correctly.

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Q898. How can we align a particular html element to the center using css ?

CSS

Ans. By using attribute align:center

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Q899. How can we assign common styling attributes to html tags and how can we do that across different tag types ?

CSS

Ans. Using class selector.

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Q900. Have you ever worked with Firebug ?

Browser

Ans. Possible Answer - Yes, for debugging Javascript issues and fixing CSS and Html.

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