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

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Q71. What sets you apart from other developers ?

or

What are the distinguished qualities you have ?

General

Ans. https://blog.timesunion.com/careers/the-10-most-important-personality-traits-for-career-success/633/

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Q72. What is TypeCasting ?

Core Java

Ans. Assigning a value of one type to a variable of another type is known as Type Casting.

Example :

int x = 10;
byte y = (byte)x;

In Java, type casting is classified into two types, Widening Casting(Implicit) widening-type-conversion and Narrowing Casting (Explicitly done) narrowing-type-conversion.

Widening or Automatic type converion - Automatic Type casting take place when,the two types are compatible and the target type is larger than the source type

Example :

public class Test {
public static void main(String[] args) {
int i = 100;
long l = i; //no explicit type casting required
float f = l;//no explicit type casting required
System.out.println("Int value " i);
System.out.println("Long value " l);
System.out.println("Float value " f);
}
}

Narrowing or Explicit type conversion - When you are assigning a larger type value to a variable of smaller type, then you need to perform explicit type casting.

Example :

public class Test{
public static void main(String[] args) {
double d = 100.04;
long l = (long)d; //explicit type casting required
int i = (int)l;//explicit type casting required
System.out.println("Double value " d);
System.out.println("Long value " l);
System.out.println("Int value " i);
}
}

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Q73. Where to use interface and abstract class ?

Core Java

^{This question was recently asked at 'Exterro,Equator Business Solutions'.This question is still unanswered. Can you please provide an answer.}

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Q74. What are the 7 OSI LAYERS ?

Networking

Ans. Layer 7 - Application
Layer 6 - Presentation
Layer 5 - Session
Layer 4 - Transport
Layer 3 - Network
Layer 2 - Data Link
Layer 1 - Physical

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Q75. 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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Q76. If you are asked to develop a financial system, how would you make sure that there are proper checks , balances and audits ?

Solution

^{This question was recently asked at 'BzzAgent'.This question is still unanswered. Can you please provide an answer.}

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Q77. why is "".equals(str); safer than str.equals("")?

Core Java

Ans. str.equals("") this statement will throw NullPointerException if str is null where as "".equals(str) works fine even if str is null

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Q78. How would you test a Twitter application ?

Testing

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Q79. 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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Q80. Do you think it's a good practice to keep passwords in config files ?

Solution

Ans. We can keep them in config as encrypted values.

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Q81. Difference between Query param and path param ?

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Q82. SQL Questions.

Database

^{This question was recently asked at 'Eurofins IT Solutions'.This question is still unanswered. Can you please provide an answer.}

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Q83. Difference between injection and auto wiring.

Spring

^{This question was recently asked at 'Yudiz Solutions'.This question is still unanswered. Can you please provide an answer.}

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Q84. Explain Rest architecture

Rest

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Q85. What is SNMP ?

Networking

Ans. SNMP or Simple Network Management protocol is an application layer protocol for exchanging management information between network devices.

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Q86. Create a component and sort the data to show specific information.

React JS

^{This question was recently asked at 'Egen Solutions'.This question is still unanswered. Can you please provide an answer.}

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Q87. how would you build application stack using Cloud Formation ?

Amazon Web Services (AWS)

Ans. Open the AWS CloudFormation console at https://console.aws.amazon.com/cloudformation . Create a new stack by using one of the following options: Choose Create Stack. This is the only option if you have a currently running stack.

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