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Interview Questions and Answers - Order By Newest

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Q1371. What technical stuff you like to do in your free time ?

Ans. [Open Ended Answer]

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Q1372. What was the most difficult task in your last job ?

Ans. [Open Ended Answer]

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Q1373. What would you do if a customer asks you to make a change immediately that require some time for thinking and analysis ?

Ans. [Open Ended Answer]

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Q1374. What is a factory design pattern ?

Ans. Factory Design Patterns is the pattern that recommends creation of separate Factory Object for creation of other object.

So its like saying - If you want to create an object of ClassA, Talk to FactoryObject ( which is an object of FactoryClass ). FactoryObject in itself encapsulates the inputs and logic required to make the decision regarding the creation and construction of object.

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Q1375. Given a 12-hour analog clock, compute in degree the smaller angle between the hour and minute hands

Ans. Zero Degree. Because the hour and minute hands overlap once in an hour.

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Q1376. How is hashcode calculated in java ?

or

What are the rules for hashcode calculation ?

Ans. General contract of hashCode is:

1.Whenever it is invoked on the same object more than once during an execution of a Java application, the hashCode method must consistently return the same integer,

2.If two objects are equal according to the equals(Object) method, then calling the hashCode method on each of the two objects must produce the same integer result.

3.It is not required that if two objects are unequal according to the equals(java.lang.Object) method, then calling the hashCode method on each of the two objects must produce distinct integer results.

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Q1377. Why main method is declared static ?

Ans. static is the keyword that makes it accessible even without creating any object and using class name only. Making it non static would like creation of object upfront before calling the method.

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Q1378. What is Spring Security ?

Ans. Spring Security is a powerful and highly customizable authentication and access control framework. It is the de facto standard for securing Spring-based applications.

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Q1379. Create a Class Bank with the methods to deposit and Withdraw ?

Ans. class Bank {
int balance;

Bank(){
balance = 0;
}

void deposit(int amount){
balance = balance amount;
}

int withdraw(int amount){
balance = balance - amount;
return balance;
}
}

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Frequently asked in high end product companies.

Q1380. Write code for LRU Cache

Ans. https://www.geeksforgeeks.org/lru-cache-implementation/

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Q1381. Explain your experience with Java, spring and web services?

Ans. Have worked on Java 7 and Java 8, In Java 8 , Worked with streams , lambda expression and default methods.

Have worked on both Spring Mvc and Spring Boot, using Spring dependency injection, Rest services , AOP , JDBC and Hibernate integration.

Have worked on Rest services using Spring and Spring Boot. Have worked on SOAP web services too.

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Q1382. Can a constructor throw an exception ?

Ans. Yes

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Q1383. Can constructor be synchronized in Java ?

Ans. No, constructors can not be synchronized in Java. In fact using the keyword synchronized with a constructor results in compilation error.

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Q1384. Will finally run if we have return statement and it exits the method early ?

Ans. finally will execute in all graceful situations - graceful executions as well as graceful exceptions. The only situation when finally block won't execute is when the app is abruptly stopped, killed or unplugged.

Sample Code for finally

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Q1385. Is there any relationship between Web.xml and Spring.xml ?

Ans. No, there is no relationship between web.xml and spring.xml but you have to configure spring.xml in web.xml in order initialize beans when application starts up

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Q1386. Why do you want to work here ?

Ans. I believe that the company would provide a good ground for my career growth and learning.

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Q1387. What are different ways for Servlet authentication ?

Ans. HTTP Basic Authentication
HTTP Digest Authentication
HTTPS Authentication
Form Based Login

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Q1388. Why do you wan to stay in IT ?

Ans. Coding , Science and Mathematics has always fascinated me. I have curious mindset that continuously look for solutions.

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Q1389. How to make sure that no request are lost in client server application ?

Ans. By keeping some sort of storage at the client side for each request and then matching it up against the response received to make sure that the request was well received.

A queue can be used for this purpose.

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Q1390. Scale yourself on Java on the scale of 1 to 10

Ans. [Open Ended Answer]

The objective of the question is to check how efficient one is in the language so that appropriate level questions are asked. Don't tell too high number if you are being interviewed for a junior or mid level position as the interviewer may throw advance level questions.

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Q1391. Is it mandatory to have a default constructor ?

Ans. No.

Default constructor is provided by compiler if no constructor is provided ( argument or no argument ) by us.

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Q1392. What is the problem with this code

double x=10.04;
int a = x;

Ans. It will give an error saying 'cannot convert from double to int'

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Q1393. Which environment variables do we need to set in order to run Java programs?

Ans. PATH, CLASSPATH and JAVA_HOME

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Q1394. Can an application have multiple main methods within different classes ? If yes, How will the app decide which one to be executed ?

Ans. Yes we can have a main method with string[] argument in every class of an application. When we execute an app we specify the starting point i.e the class that will get the control first and hence main method of that class gets executed.

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Q1395. Does importing a package imports all its sub packages too ?

Ans. No, but we can use wild card (*) to do so

For example -

import java.util.*

will import all packages with name starting with java.util

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Q1396. What is the default value of a declared object reference ?

Ans. Null

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Q1397. Is there a way to know size of an object in Java ?

Ans. No, Java doesn't have a sizeOf operator. In C / C++ , its required to determine how much memory allocation is required which is not the case with Java. Java handles memory allocation and deallocation intrinsically.

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Q1398. What are the different ways to handle an exception ?

Ans. 1. Wrap the desired code in try block followed by a catch / finally to catch the exception

2. Declare the throws clause with exceptions that the code is expected to throw as an indication to the calling method to take care of it.

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Q1399. How does Java handle integer overflows and underflows?

Ans. It uses those low order bytes of the result that can fit into the size of the type allowed by the operation.

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Q1400. Is delete a keyword in Java ?

Ans. No, delete is not a keyword in Java. Destruction of objects is taken care by Java Garbage Collection mechanism.

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