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Interview Questions and Answers for 'Tc' - 141 question(s) found - Order By Rating

Q1. Difference between ViewChild and ContentChild.

Ans. Any directive, component, and element which is part of component template is accessed as ViewChild. Whereas, any element or component which is projected inside is accessed as ContentChild.

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Q2. What is Message Queue or MQ ?

Data Structure

Ans. Message queues implement an asynchronous communication pattern between two or more processes/threads whereby the sending and receiving party do not need to interact with the message queue at the same time. Messages placed onto the queue are stored until the recipient retrieves them. Message queues have implicit or explicit limits on the size of data that may be transmitted in a single message and the number of messages that may remain outstanding on the queue.

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Q3. Why Spring boot is preferred over Spring MVC ?

Ans. Spring Boot aims to shorten the code length and provide you with the easiest way to develop a web application. It helps create a stand-alone application with less or almost zero-configuration.

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Q4. Give an example of a time when you recommended code changes in a code review that simplified the code ?

Code Review

Ans. If there is a situation to remove duplicates values from an arrayList. Developer implemented using legacy for-loop where I suggested to use Linked hash set to remove duplicates from the list.

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Q5. Give specific situation about when to go for constructor based injection and setter based injection in spring.

Spring

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Q6. what is dispatcher servlet@componentScan use ?

Spring Framework

Ans. @ComponentScan in a Spring Application.

With Spring, we use the @ComponentScan annotation along with the @Configuration annotation to specify the packages that we want to be scanned. @ComponentScan without arguments tells Spring to scan the current package and all of its sub-packages.

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Q7. Details of networking apis supported by java.

Ans. retrofit 2, volly and OkHttp

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Q8. What is the concept of hibernate versioning ?

Hibernate

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Q9. What are inline functions ?

Programming Language

Ans. Inline functions , just like C++ Macros is an optimized technique used by compiler to reduce the execution time. If the function is working on pre identified values ( which aren't resolved at runtime ), the function can execute the method and evaluate the outcome at compile time only instead of making a function call at runtime.

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Q10. Difference between CloudWatch and CloudTrail ?

Amazon Web Services (AWS)

Ans. CloudWatch is for monitoring resources whereas CloudTrail is for auditing activity.

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Q11. How frequently Cloudwatch monitor AWS services for generating metrics ?

Amazon Web Services (AWS)

Ans. 5 mins for Standard / Basic
1 min for Detailed / advanced

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Q12. What are the Default metrics available for EC2 in CloudWatch ?

Amazon Web Services (AWS)

Ans. CPU, Disk, Network, Status

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Q13. Are CloudWatch metrics available with free tier ?

Amazon Web Services (AWS)

Ans. Only Basic not advanced

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Q14. Which AWS service can be used to monitor EC2 ?

Amazon Web Services (AWS)

Ans. CloudWatch

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Q15. Which AWS service can be used for creating Billing Alarms ?

Amazon Web Services (AWS)

Ans. AWS CloudWatch

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Q16. If you have to pull a sub string out of a string, which method would you use - using String methods or Pattern / Matcher ?

Design

Ans. It depends on how complex it is and if in future it would need any sort opf debugging. It's not easy to debug code if it's making heavy use of shortcuts like Lambda , Patterns etc.

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Q17. What is @EnableSptringMVC ?

Spring

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Q18. How can we schedule Lambda function to run daily ?

Amazon Web Services (AWS)

Ans. We can schedule that through CloudWatch.

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Q19. 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.

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Q20. 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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Q21. What is context switching wrt Threads in Java?

Core Java

Ans. Context Switching is the process of storing and restoring of CPU state so that Thread execution can be resumed from the same point at a later point of time.

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Q22. Difference between == and === ?

JavaScript

Ans. == compares values === is used in scripting languages for comparing two values as well as there data tpe. like in js,php.

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Q23. Write code to sort an array.

Algorithm

Ans. https://www.geeksforgeeks.org/arrays-sort-in-java-with-examples/

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Q24. Draw uml for singleton pattern.

Design

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Q25. Why do you want to leave your current job ?

General

Ans. The most effective and acceptable reasons for leaving your current job should be positive e.g. moving forward in your life or career

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Q26. How do you fetch the records form database ?

Database

Ans. To fetch records from a database, you would use SELECT statements

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Q27. What are the problems one could face while working with serverless technologies like AWS Lambda ?

Amazon Web Services (AWS)

Ans. Warm up time for certain technologies like Java ( JVM Warmup )

Performance

Size of Deployable ( Bigger size packaging should go in S3 )

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Q28. What is collection framework in Java ?

Core Java

Ans. The Java collections framework (JCF) is a set of classes and interfaces that implement commonly reusable collection data structures. Although referred to as a framework, it works in a manner of a library. The JCF provides both interfaces that define various collections and classes that implement them.

Sample Code for Map

Sample Code for HashMap

Sample Code for Treemap

Sample Code for set

Sample Code for hashset

Sample Code for treeset

Sample Code for list

Sample Code for arraylist

Sample Code for linkedlist

Sample Code for queue

Sample Code for priorityqueue

Sample Code for concurrenthashmap

Sample Code for vector

Sample Code for stack

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Q29. Explain OOps concepts.

Core Java

Ans. There are four main OOP concepts in Java. These are:

Abstraction. Abstraction means using simple things to represent complexity. We all know how to turn the TV on, but we don?t need to know how it works in order to enjoy it. In Java, abstraction means simple things like objects, classes, and variables represent more complex underlying code and data. This is important because it lets avoid repeating the same work multiple times.

Encapsulation. This is the practice of keeping fields within a class private, then providing access to them via public methods. It?s a protective barrier that keeps the data and code safe within the class itself. This way, we can re-use objects like code components or variables without allowing open access to the data system-wide.

Inheritance. This is a special feature of Object Oriented Programming in Java. It lets programmers create new classes that share some of the attributes of existing classes. This lets us build on previous work without reinventing the wheel.

Polymorphism. This Java OOP concept lets programmers use the same word to mean different things in different contexts. One form of polymorphism in Java is method overloading. That?s when different meanings are implied by the code itself. The other form is method overriding. That?s when the different meanings are implied by the values of the supplied variables. See more on this below.

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Q30. What is abstraction ?

Design

Ans. Abstraction is a process of hiding the implementation details and describing only the functionality to the user.

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