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

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Q161.

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Q162. write a program for 4 digit otp generation?

Design

Ans. import java.util.Random;

public class OTPGenerator {
public static void main(String[] args) {
int otpLength = 4;
String otp = generateOTP(otpLength);
System.out.println("Generated OTP: " otp);
}

private static String generateOTP(int length) {
StringBuilder otp = new StringBuilder();
Random random = new Random();

for (int i = 0; i < length; i ) {
int digit = random.nextInt(10);
otp.append(digit);
}

return otp.toString();
}
}

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Q163. If you are asked to develop a financial system, how would you make sure that there are proper checks , balances and audits ?

Solution

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Q164. Design an in memory object oriented system for a Car manufacturing Company ?

Design

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Q165. Code an elevator simulator.

Design

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Q166. Write a calculator and find if a character appears more than n times ?

Design

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Q167. Can we keep application configuration at different places and what could be the consideration for choosing multiple places for doing so ?

Design

Ans. Yes an application can have configuration stored at multiple places. Factors that could facilitate such a design could be

1. Type of config information - We may have a case to store confidential information differently than other regular config value

2. Environment - We may like to have a base config ( defined in application package ) and then a different override mechanism in different environments.

3. Centralization - Sometime some configs need to be shared across application and hence centralized.

4. Testing - Testing against config may not be possible in some enviornments in certain cases and hence additional config store might be kept for testing purpose only.

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Q168. Design a appointment booking system for a chain of hospitals.

Design

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Q169. Create DB schema for Employee, Department.

Database

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Q170. Write program to control traffic in a parking lot.

Design

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Q171. Can you tell us a use case of reflection in java that you have applied ?

Design

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Q172. What is runtime Polymorphism ?

Design

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Q173. Find the second largest array element without sorting?

Design

Ans. We initialize two variables first and second to INT_MIN as,
first = second = INT_MIN
then Start traversing the array,
If the current element in array say arr[i] is greater
than first. Then update first and second as,
second = first
first = arr[i]
If the current element is in between first and second,
then update second to store the value of current variable as
second = arr[i]
then Return the value stored in second.

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Q174. Explain SOLID principles.

Design

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Q175. What is your opinion about caching ?

Design

Ans. Caching is a mechanism that provides faster access but at the cost of additional space. Caching is good if we need faster access and if it takes extensive processing to come to a value which doesn't gets changed frequently.

Caching could be an overhead if we don't need fast access or if the processed value changes too frequently.

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Q176. What are Hooks in programming and Design Patterns ?

Design

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Q177. What is the advantage of moving text messages to a separate properties file , like message.properties instead of hard defining it on the html ?

Design

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Q178. Design Texas Hold Em poker game

Design

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Q179. How would you design the database schema for an event?

Database

Ans. Broad question, but if the company need velocity, think about use a NO SQL instead of regular SQL databases.

Also prefers materialized views instead of joins to fetch data quickly.

Regarding the database design, there are very good design tools for professional database (to develop proper indexes and good database design) one of the best is QuickDBD

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Q180. How can we create an arraylist of unique values ?

Core Java

Ans. We can put the value in a set to enforce uniqueness and then dum those value into an arraylist.

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Q181. Write a Program to find out negative numbers in a list.

Design

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Q182. Design pattern used in struts.

Struts

Ans. Struts controller uses the Command design pattern and the action classes use the Adapter design pattern. The process() method of the RequestProcessor uses the Template method design pattern.

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Q183. Design Parking Lot.

Design

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Q184. What are various design frameworks for Banking profile ?

Design

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Q185. Could you walk me through and draw out a sketch of a recent architecture project you completed ?

architecture

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Q186. Which of the following class types in MVC should have Business Logic ?

Design

a. Model

b. View

c. Controller

d. JSP

Ans.a. Model

Q187. Listeners are example of ..

Design

a. Factory design Pattern

b. Abstract Factory Design Pattern

c. Singleton Design Pattern

d. Observer Design Pattern

Ans.d. Observer Design Pattern

Q188. Which of the following Design pattern has been used with Hibernate Criteria ?

Hibernate

a. Filter

b. Prototype

c. Builder

d. Observer

Ans.a. Filter

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