Interview Question and Answers | Search Coding Interview Questions

Interview Questions and Answers

Q201. What is a transitive dependency ? Can we override Transitive Dependency version and If Yes, how ?

Ans. Transitive dependency is the dependencies not defined directly in the current POM but the POM of the dependent projects.

Yes we can override transitive dependency version by specifying the dependency in the current POM.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve maven maven dependencies maven transitive dependency technical lead build management}

Usually asked to experienced developers.

Q202. What is a cyclic dependency ?

Maven

Ans. A has dependency of B, B has dependency of C and C has dependency of A

With Maven 2 , came transitive dependency wherein in above scenario, C will acts as a dependency of A as if this dependency has been defined directly in A but the negative side is that if it leads to cyclic dependency , it creates problems.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve maven dependencies cyclic dependencies transitive dependencies build management Asked in 1 Companies frequent}

Q203. What is ConcurrentModificationException ?

Core Java

Ans. This is the exception that is thrown when we try to modify the non concurrent collection class while iterating through it.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve java collections concurrentmodificationexception exception concurrency Asked in 14 Companies intermediate}

Q204. What is the use of @GeneratedValue annotation in Hibernate?

Hibernate

Ans. This annotation is added to the auto increment column with the strategy to increment the column value. Usually this is added to the surrogate primary key column and specified with the Database Sequence.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve hibernate hibernate annotations @generatedvalue database sequence}

Q205. What is the use of runnable interface if we can always create a new thread using Thread class ?

Core Java

Ans. It's a choice to be made whether to use first approach ( Thread class ) or second approach ( runnable interface ) by the programmer. The second facility has been given for cases where your class is already extending some parent class and hence cannot extend another class ( for Thread ) as Java doesn't allow multiple inheritance.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve java threads multithreading runnable interface concurrency}

Q206. What is a BlockingQueue?

Data Structures

Ans. BlockingQueue is a Queue that supports operations that wait for the queue to become non-empty when retrieving and removing an element, and wait for space to become available in the queue when adding an element.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve blockingqueue collections java concurrent collections Asked in 10 Companies}

Q207. Which of the following collections stores its elements in insertion Order ?

a. HashMap
b. TreeMap
c. LinkedHashMap
d. LinkedMap

Core Java

Ans. LinkedHashMap

Sample Code for LinkedHashMap

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve linkedhashmap collections java map}

Q208. In what order the elements of a HashSet are retrieved ?

a. Random Order
b. Insertion Order
c. Natural Sorting Order
d. Inverse Natural Sorting Order

Core Java

Ans. Random Order

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve collections set hashset java}

Try 1 Question(s) Test

Q209. Overridden methods must have the same ...

a. name
b. name and argument list
c. name, argument list, and return type
d. name, argument list, return type and belong to the same class

Ans. name and argument list

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve java overriding}

Try 2 Question(s) Test

Q210. Which of the following is not the advantage of Mocking frameworks ?

a. It helps testing the module independently
b. It helps in faster unit testing
c. It helps in testing code even when external dependencies like service calls are not working
d. It helps in doing end to end Integration Testing

Ans. It helps in doing end to end Integration Testing

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve mocking frameworks mockito unit testing junits}

Q211. Which of the following file is called deployment descriptor ?

a. application.xml
b. project.xml
c. web.xml
d. build.xml

Java EE

Ans. web.xml

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve configuration files deployment server java}

Q212. Which of the following is dependency exclusion ?

a. A doesn't depend on C and then A marks C as excluded.
b. A Depends on B and B depends on C and then A can mark B as excluded.
c. A and B depends on C and then they can mark C as excluded.
d. A depends upon B and B depends upon C then A marks C as excluded.

Maven

Ans. A depends upon B and B depends upon C then A marks C as excluded.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve maven dependency exclusion}

Q213. Which of the following is false about Constructors ?

a. Constructor can be overloaded
b. A no argument constructor is provided by the compiler if we declare only constructors with arguments.
c. Constructors shouldn't have any return types , not even void.
d. If super is not explicitly called, still super() is intrinsically added by the compiler.

Core Java

Ans. A no argument constructor is provided by the compiler if we declare only constructors with arguments.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve java oops constructor}

Try 2 Question(s) Test

Q214. Which of the following doesn't extend Collection interface ?

a. Set
b. List
c. Map
d. Queue

Core Java

Ans. Map

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve java collections collection interface}

Q215. Which of the following Java feature promotes Code Re usability ?

a. Abstraction
b. Encapsulation
c. Inheritance
d. Polymorphism

Core Java

Ans. Inheritance

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve java java concepts java features code reusability}

Q216. Which of the following is not a build tool or plugin ?

a. Maven
b. Ant
c. Gradle
d. svn

Tool

Ans. svn

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve java build tools}

Q217. enums are intrinsically ..

a. private
b. public
c. static
d. final

Core Java

Ans. static

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve java enum}

Q218. What will happen if we don't have termination statement in recursion ?

Ans. Function call allocates a stackframe in stack. Every stackframe will use some memory to store local variables, parameters and to remember return address. Without terminating condition stackframes will keep consuming memory from stack and eventually program will result in stackoverflow error.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve recursion break statement break stackoverflow exception stackoverflow memory management memory exceptions}

Q219. In which cases , moving methods to utility class could be useful ?

Core Java

Ans. It could be worthy to move a method to util class if the method needs to be shared, doesn't require polymorphic behavior and need not be overridden in special cases.

Don't belong to one group through is-a relationship ( You can share through parent class method )

Don't implement a specific interface ( java 8 default methods )

Doesn't involve complex computing as you will be loosing the benefit of object state with just static method.

Doesn't require polymorphic behavior as static methods don't participate in runtime polymorphism.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve utility classes util classes static methods application design rare}

This question can be asked in different variants like performace improvement of an application, improving performance for DB communication etc.

Q220. What are the ways in which execution time of the code can be improved ?

Solution

Ans. This depends on entirely upon the code type. For example

1.If its just logic, we can try it to short circuit or put the if / switch case with maximum probability in the beginning.

2. Can use faster data structures, for eg - random retrieval instead of sequence / iterator

3. Working with primitive types or even bytes instead of Objects, even though it may result in marginal improvement.

4. If its service call, then service call with bulk load can help

5. If DB Operation, then with use of Indices , Views or using ORM , cache etc.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve performance improvement code optimization Asked in 1 Companies}

Q221. Difference between GET and POST Requests ?

Web Service

Ans. GET is supposed to get information from the server. Client sends the minimal information so that Server can respond with the response body on basis of request. For example - You want to get complete employment record for employee id 123

POST is supposed to send the information for submission. Payload or a Body is usually sent so that it can be persisted on the server. For example - Sending the complete information of an employee ( id, name , dept etc ) to the server for persisting it.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve get vs post web service rest Asked in 11 Companies basic frequent}

Q222. How do you resolve Maven Dependencies issue while upgrading dependencies versions ?

Maven

Ans. Step 1 - Upgrade the required dependency , perform build and check build errors

Step 2.1 - If the error is of missing transitive dependency ( which is rare and means that the previous version has a dependency which is missing in the later version ), I would look for the dependency in google and hence will include it as direct dependency in Pom file.

Step 2.2. If the error is for Duplicate dependencies , and the choice is between transitive and direct dependency, I usually remove the direct dependency.

Step 2.3 - If the error is for Duplicate dependencies , and both are transitive dependencies. I first make a choice ( usually later version ) and then ignore the previous version dependency.

Step 2.4 - If the error is for Duplicate dependencies , and there are more than 2 duplicates, I usually ignore it by specifying within maven-enforcer-plugin config.

Step 3 - Perform a Clean Build.

Step 4 - Check Maven Dependency Tree to make sure that Duplicates have been removed or dependency is there in case of missing dependency.

Step 5 - Perform tests and make sure that there are no runtime problems.

Step 6 - If there are runtime problems ( which very likely occurs if you have different version dependencies , very likely by doing 2.4 , you will have to remove step 2.4 and alternately perform 2.2 or 2.3 )

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve maven maven dependency transitive dependency}

Q223. What is coupling and Cohesion ?

Design

Ans. Coupling is the degree of interdependence between software modules, a measure of how closely connected two modules are or the strength of the relationships between modules.

Cohesion refers to the degree to which the elements of a module belong together. Cohesion measures the strength of relationship between pieces of functionality within a given module.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve coupling cohesion Asked in 10 Companies frequent}

Frequently asked Generic Question.

Q224. Why do you want to work for our company ?

General

Ans. [Open Ended Answer]

Usually answered stating your keen interest in the role offered and challenges and opportunities the role offers.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve Asked in 42 Companies frequent}

Q225. Design a Data Structure for a full text Search ?

Design

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

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve Full Text Search Data Structure Asked in 1 Companies expert}

Q226. Write a Program to reverse a Linked List ?

Data Structure

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

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve Asked in 2 Companies}

Q227. What are different types of variables a class can have ?

Core Java

Ans. 1. Method local variables - These are declared and defined within a method ( instance or static methods ) and their scope is limited to the method itself. They are destructed once the execution of method completes. They are stored in stack memory.

2. Instance variables - These are declared as non static variables as part of the class.They are initialized as part of object creation ( constructor ) and are destructed by java's garbage collection mechanism and hence stored in heap.

3. Static variables - These are declared with the static keyword and are part of the class. They are initialized at the time of class loading and are destructed by java's garbage collection mechanism and hence stored in heap.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve java variables}

Q228. Why java doesn't support multiple Inheritance ?

or

Explain Java Diamond Problem.

Core Java

Ans. class A {
void test() {
System.out.println("test() method");
}
}

class B {
void test() {
System.out.println("test() method");
}
}

Suppose if Java allows multiple inheritance like this,

class C extends A, B {
}

A and B test() methods are inheriting to C class.

So which test() method C class will take? As A & B class test() methods are different , So here we would Facing Ambiguity.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve multiple inheritance object oriented programming (oops) oops concepts diamond problem Asked in 20 Companies basic frequent}

Q229. Design an app to find 10 most visited urls

Core Java

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

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve Asked in 1 Companies}

Q230. Trim a string without using String library method

Core Java

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

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve code coding.string trim a string Asked in 1 Companies}

Search Interview Questions

Help us and Others Improve. Please let us know the questions asked in any of your previous interview.