Interview Questions and Answers for 'T' | Search Interview Question

Interview Questions and Answers - Order By Rating

Q511. What is the sequence in which you write different types of autmated test cases ?

Testing

Ans. Junits or Unit Tests
Integration Tests
End to End Automation if required
Stress / Load Tests if required

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

_{Like Discuss Correct / Improve}

Q512. What is the sequence in which you write different types of autmated test cases ?

Testing

Ans. Junits or Unit Tests
Integration Tests
End to End Automation if required

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

_{Like Discuss Correct / Improve}

Q513. Explain servlet lifecycle

Java EE

Ans. Init -> service -> destroy.

Out of these, init and destroy are called once per servlet whereas service is called every time when a request is made to the servlet.

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

_{Like Discuss Correct / Improve servlet Asked in 6 Companies}

Q514. Explain Hibernate caching mechanism

Hibernate

Ans. Every fresh session having its own cache memory, Caching is a mechanism for storing the loaded objects into cache memory. The advantage of cache mechanism is, whenever again we want to load the same object from the database then instead of hitting the database once again, it loads from the local cache memory only, so that the no. of round trips between an application and a database server got decreased. It means caching mechanism increases the performance of the application.

In hibernate we have two levels of caching

First Level Cache [ or ] Session Cache
Second Level Cache [ or ] Session Factory Cache [ or ] JVM Level Cache

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

_{Like Discuss Correct / Improve Asked in 23 Companies}

Q515. What is XSS or Cross site scripting ?

Security

Ans. XSS or cross site scripting is a javascript vulnerability in web applications. The easiest way to explain this is with a case when the user enters a script in the client side input fields and that input gets processed without getting validated. This leads to untrusted data getting saved and executed on the client side.

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

_{Like Discuss Correct / Improve Asked in 3 Companies}

Q516. in the following class:
class A {
void methoda(Object o) {
Sysout("Object");
}

void methoda(String s) {
Sysout("String");
}

public static void main(String []args) {
A a = new A();
a.methoda(null);
}
}

what will be printed?

Core Java

Ans. String

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

_{Like Discuss Correct / Improve Code Coding method overloading Asked in 1 Companies}

Q517. How many read and write operations are provided at the same time by ConcurrentHashMaps ?

Core Java

Ans. ConcurrentHashMaps provide unlimited read operation fro multi threaded environment. For write operation only one thread can change value for particular segment of map.

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

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

Q518. Difference between indexing and partioning

Database

Ans. Creating an index creates a separate table. ... Indexes are used to speed the search of data within tables. Partitions provide segregation of the data at the hdfs level, creating sub-directories for each partition. Partitioning allows the number of files read and amount of data searched in a query to be limited

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

_{Like Discuss Correct / Improve indexing partitioning Asked in 3 Companies}

Q519. serialization and deserialization of singleton class

Core Java

Ans. The problem with serialized singleton class is that whenever we deserialize it, it will create a new instance of the class. To overcome this scenario all we need to do is to provide the implementation of readResolve() method.

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

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

Q520. Detect a loop in a linked list

Data Structure

Ans. Work with two pointers on the linked list - a slow pointer (increments by one node) and a fast pointer (increments by two nodes). If both of these pointers meet at the same node, then there is a cycle in the linked list. Otherwise, no cycle.

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

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

Q521. What is strictfp Modifier?

Core Java

^{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 strictfp}

Q522. What is the Main Advantage of the native Key Word?

Core Java

^{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 native keyword}

Q523. What is @EnableSptringMVC ?

Spring

^{This question was recently asked at 'Tata Consultancy (TCS)'.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}

Q524. What is doCallRealMethod() method used for ?

PowerMock

Ans. When we Mock an object and then make a reference to any method using mocked object reference , java never makes a call to that method and looks for mocked value to be returned or null if none specified. But If we want that to be overridden and want java to make actual method call upon using mocked object reference, this method can be used.

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

_{Like Discuss Correct / Improve junit mocking java unit testing Mockito}

Q525. What does the following code

MockitoAnnotations.initMocks(this);

Mockito

Ans. Initializes objects annotated with Mockito annotations

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

_{Like Discuss Correct / Improve mocking java mocking frameworks Mockito}

Q526. How can you verify if there were interactions with a static method using PowerMock ?

PowerMock

Ans. We can use PowerMockito.verifyStatic for this purpose

PowerMockito.verifyStatic(VerificationModeFactory.times(1));
<Class_Name>.<static_method_name>;

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

_{Like Discuss Correct / Improve mocking static methods}

Q527. Have you ever used PowerMock ? If yes , which mocking framework you have used it with ?

PowerMock

Ans. Yes, I have used PowerMockito with Mockito.

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

_{Like Discuss Correct / Improve Mockito}

Q528. Explain hibernate associations.

Hibernate

^{This question was recently asked at 'Ray Business 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 1 Companies}

Q529. What is DDOS attack ?

Security

Ans. DDOS is denial of service attack in which the hacker seeks to make a machine or resource unavailable to its expected users by disrupting services.

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

_{Like Discuss Correct / Improve ddos cyber security}

Q530. What is the difference between try-catch and @ExceptionHandler in Java/Spring Boot?

Spring Boot

Ans. ExceptionHandler is Used to handle at Method level

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

_{Like Discuss Correct / Improve @ExceptionHandler}

Q531. How you can check Object is created or not in case of Singleton using Object class method ?

Design

Ans. Reflections-- setAccesible--avoid using enumns

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

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

Q532. Differences between class not found exception and noclassdef found error ?

Core Java

Ans. ClassNotFoundException is an exception that occurs when we try to load a class at run time using Class.forName() or loadClass() methods and mentioned classes are not found in the classpath.

NoClassDefFoundError is an error that occurs when a particular class is present at compile time, but was missing at run time.

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

_{Like Discuss Correct / Improve exception handling ClassNotFoundException NoClassDefFoundError Asked in 1 Companies}

Q533. Have you ever changed IAM policy ?

Amazon Web Services (AWS)

Ans. Yes I did it for an execution role of a Lambda function to give it write access on S3 bucket.

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

_{Like Discuss Correct / Improve aws security aws iam amazon iam}

Q534. How can we schedule Lambda function to run daily ?

Amazon Web Services (AWS)

Ans. We can schedule that through CloudWatch.

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

_{Like Discuss Correct / Improve lambda function aws lambda aws serverless computing amazon cloud serverless computing amazon lambda function aws cloudwatch amazon cloudwatch}

Q535. Have you ever heard of the term "dry run" ? What does it mean ?

Testing

Ans. It means that the run is just for testing purpose.

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

_{Like Discuss Correct / Improve dry run}

Q536. How can we make an S3 file public through Java program ?

Amazon Web Services (AWS)

Ans. We can get the object and then can set CannedAcl property as "PublicRead"

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

_{Like Discuss Correct / Improve aws s3 aws storage amazon cloud storage amazon s3}

Q537. Can making the S3 bucket public ,makes all objects / files inside as public too ?

Amazon Web Services (AWS)

^{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 aws s3 aws storage amazon cloud storage amazon s3}

Q538. What would you do if you see an error thrown by a lambda function as "Access Denied" while doing something with S3 ?

Amazon Web Services (AWS)

Ans. Just like people , AWS resources too have execution roles or permissions. Seems like in such a situation Lambda function may not have sufficient privileges to perform operations on S3. For example - The execution role of Lambda may just have read permissions on S3 and we may be trying to perform PutObject operation.

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

_{Like Discuss Correct / Improve aws s3 aws storage amazon cloud storage amazon s3 aws lambda aws serverless computing amazon cloud serverless computing amazon lambda}

Q539. Difference between StoreModule.forRoot() and StoreModule.forFeature() ?

NgRx

Ans. forFeature is used for lazily registering reducers with the module.

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

_{Like Discuss Correct / Improve ngrx angular angular ngrx integration ngrx store}

Q540. Difference between git fetch and git pull ?

Git

Ans. git pull does a git fetch followed by a git merge. git fetch only change the remote tracking but never attempts to make changes to the local.

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

_{Like Discuss Correct / Improve git fetch vs git pull git fetch git pull 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.