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

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Q1391. What are different methods to get the permanent gen space of running application?

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Q1392. 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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Q1393. What is difference between clustered and non clustered index?

Database

Ans. The clustered index determines how the data is stored in the rows of a table.The non-clustered index stores the data at a single place and the indexes are stored at another place.

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Q1394. What are the ways to get the values from list ?

Data Structure

Ans. list.get(index);

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Q1395. What is Left Outer Join ?

Database

Ans. It returns all the rows form the left table and matches the rows in both tables.

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Q1396. How one dao Implementation object (singleton) can handle multiple requests?

Design Pattern

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Q1397. What is Jar ?

Core Java

Ans. It is a file format based on the popular ZIP file format and is used for aggregating many files into one.

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Q1398. What is an applet ?

Java EE

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Q1399. What is EC2 and EC2 instance ?

Amazon Web Services (AWS)

Ans. EC2 is elastics compute cloud is one of the amazon service and ec2 instance is one type of virtual server which you create from AMI.

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Q1400. What are some of the vendors providing cloud computing infrastructure ?

Server

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Q1401. How cloud computing is different than virtualization ?

Server

Ans. A Virtualization is software that virtualizes your hardware into multiple machines while Cloud computing is the combination of multiple hardware devices. In Virtualization, a user gets dedicated hardware while in Cloud computing multiple hardware devices provide one login environment for the user.

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Q1402. What are some of the computation services provided by AWS ?

Amazon Web Services (AWS)

Ans. EC2, EKS, EKC , Lambda

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Q1403. Tell me something about Amazon Lambda.

Amazon Web Services (AWS)

Ans. AWS Lambda is an event-driven, serverless computing platform provided by Amazon as a part of Amazon Web Services. It is a computing service that runs code in response to events and automatically manages the computing resources required by that code. It was introduced in November 2014.

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Q1404. Explain debugging

Process

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Q1405. What is an Interface ?

Core Java

Ans. The interface is a mechanism to achieve abstraction. Interfaces can have abstract methods and variables. It cannot have a method body.

Sample Code for interface

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Q1406. What is composition ?

Core Java

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Sample Code for composition

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Q1407. Find Max from Stack in O(1) complexity

Algorithm

Ans. Create one extra field called MAX O(1)

when you an element to the stack check these two condition
1. Stack is empty, then MAX = element
2. Stack is not empty then check if the element is greater than MAX then MAX = element

when getMax fuction is called, then return MAX

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Q1408. How do you define a functional interface?

Core Java

Ans. Create interface with the only one non-overriding abstract method and annotate it with @FunctionalInterface

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Q1409. When do you use a Vector?

Core Java

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Q1410. What is the difference between AWS Gateway API and Lambda ?

Amazon Web Services (AWS)

Ans. AWS API Gateway is the endpoint URI to get invoke. Whereas Lambda is the compute function being invoked from API Gateway or S3 or SNS

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Q1411. Can we build web services using AWS Lambda ?

Amazon Web Services (AWS)

Ans. We have to complement it to AWS Gateway API.

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Q1412. What are the benefits of using AWS Lambda over EC2 ?

Amazon Web Services (AWS)

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Q1413. Can we reserve resources in AWS Lambda just like we do for Ec2 instances ?

Amazon Web Services (AWS)

Ans. You can have reserved capacity with AWS Lambda. This guarantees that this number of concurrent Lambdas are always available for that function.

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Q1414. Can we modify a list while iterating it ?

Core Java

Ans. No,we cannot.I t will give concurrentModificationExceptin error. It can be resolved by using ConcurrentClasses like ConcurrentHashMap,CopyOnWriteArrayList,BlockingQueue etc which are fail-safe and wont give exception.

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Q1415. How is RDBMS different from DBMS ?

Database

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Q1416. Explain Binary Search

Algorithm

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Q1417. What are micro services ?

Web Service

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Q1418. What is the use of Log4j ?

Logging

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Q1419. How to capture Screenshot when the testcases are failed?

Testing

Ans. Using Listeners

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Q1420. What is the use of @import annotation ?

Ans. @Import annotation in Spring allows you to load bean definitions from one or more another @Configuration files or Components. You might not want to configure all the beans in one configuration file.

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