Interview Questions and Answers for 'T' | Search Interview Question

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Q1981. How would you design a Thread Pool ?

Design

Ans. By using Executor Framework , we can create Thread pool

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Q1982. Suppose you have 8 balls, one of them is either have more/less weight, In how many least possible iterations would you find that ball?

Design

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Q1983. What is hashing ?

data structure

Ans. Hashing is a technique to calculate the hash code for any object

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Q1984. Draw uml for singleton pattern.

Design

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Q1985. Can you name few Java packages which you frequently used ?

Core Java

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Q1986. Can you tell something about Web security ?

Web

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Q1987. If we have width of an html element as 100px and a border of 10 px. What will be the effective width of the element ? Will the border start after 100 px or after 90 px ?

Html

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Q1988. Can you create html and css for a rectangular shape button with width 10px.

CSS

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Q1989. What is the difference between Java OR operator and Java script OR operator ?

JavaScript

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Q1990. What are the advantages of using cascade style sheets or css ?

CSS

Ans. We can enforce consistent UI and can have single point of change for UI components.'

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Q1991. How do you debug Javascript code ?

JavaScript

Ans. Possible Answer - I use either Firebug or Chrome Developer tool.

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Q1992. Have you ever worked with Firebug ?

Browser

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

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Q1993. 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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Q1994. How can we align a particular html element to the center using css ?

CSS

Ans. By using attribute align:center

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Q1995. 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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Q1996. 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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Q1997. 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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Q1998. How many bytes a character takes with UTF-8 encoding ?

Encoding

Ans. it takes 1 to 4 bytes

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Q1999. How executor service is better than using primitive Threading mechanism using Thread class or runnable Interface ?

Core Java

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Q2000. 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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Q2001. 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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Q2002. 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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Q2003. Have you used Java 8 Lambda expressions ?

Core Java

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Q2004. What are you using AWS lambda for ?

Amazon Web Services (AWS)

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Q2005. What is the thing that would turn you off for a company ?

General

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Q2006. How do you prefer to resolve team disputes , just talking or in written ?

general

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

Q2007. 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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Q2008. 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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Q2009. 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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Q2010. 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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