Interview Questions and Answers for 'Design' | Search Interview Question

Interview Questions and Answers - Order By Newest

Q121. How Reflection can break any design pattern ?

Ans. Using java reflection api, we can tweak into a class and modify it's runtime behavior and hence modify the pattern it might be using.

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Q122. Can we build an application that where few functions gets executed as a cron as well as services. How ?

Design

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Q123. How can we make sure that only one object of a class get's created ?

Design

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Q124. Do you think we should have security Tokens in Url ?

Design

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Q125. What information should be sent in url vs sent within the body in case of Post request ?

Design

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Q126. Given the Phone keys mapping between numbers and characters as following

1 - a,b,c
2 - d,e,f

and so on, Write a Program that takes the integer as input and then print all possible combinations of characters matching those integers.

For example - 12 should return

ad,ae,af,bd,be,bf,cd,ce,cf

Design

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Q127. Given a comma separated string that signifies the current position in 4 * 4 tic tac toes game, write a program that gives the result of the game - If anyone win and if yes then who and if the game is still open.

For example - x,0,x,x,x,0,0,0,0,x,0,x means that 00 index has x, 01 has 0 and so on with x(3,3) has last element x

Design

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Q128. Does it make sense to send someone's social security number as path parm in a get request ?

Design

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Q129. What is meant by Loosely coupled database design ?

Design

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Q130. Write code to reverse a C-Style String

Design

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Q131. Write a method that takes a string as input and identifies if any permutation of the String is Palindrome ? For example - ttoobb has a permutation 'bottob' which is a palindrome.

Design

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Q132. Given a list of People, We need to distribute their gifts in such a way that

Any Person shouldn't get it's gift back
If A's gift goes to B, B's gift shouldn't go to A

Write a method that returns a Map where Key is the Person's name and value is the name of person whose gift was exchanged.

Design

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Q133. What is the difference between Observer and Subscriber ?

Design

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Q134. What is a lapsed listener problem ?

Design

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Q135. How observer pattern can introduce memory leaks ?

Design

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Q136. How can we make sue that only 1 object gets created ?

Design

Ans. We can use Singleton Design Pattern.

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Q137. In Case of multi layered application, If DAO layer throws an exception , How will you handle it upstream ?

Design

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Q138. Design a Program to clone an object and all it's children.

Design

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Q139. Tell something about Dependency Injection and it's drawbacks. In which situation, you may not like to use dependency injection ?

Design

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Q140. Given a String with letters , numbers and special characters , extract Tokens from it. The rules for Token extraction are ac follows

1. Should for token of all characters till a number or special character is found
2. Should form token of all numbers till a character or special character is found
3. Special character in itself is a token
4. Ignore white spaces

For example - Bob Said "He is here"

should result in

Bob A
Said A
" S
He A
is A
here A
" S

where a is specifying alphabet and S as special character

Design

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Q141. What is immutability and What are it's disadvantages ?

Design

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Q142. Design database schema for Facebook like application.

Database

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Q143. How would you design a Thread Pool ?

Design

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

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Q144. 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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Q145. Draw uml for singleton pattern.

Design

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Q146. 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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Q147. 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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Library Management System has always been the favorite question. This questions is asked irrespective of level.

Q148. 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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Q149. 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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Q150. How to calculate string length without using inbuilt function

Core Java

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