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Q1981. What is an applet ?

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

Q1982. What is the difference between Reserved and On Demand instance ?

Amazon Web Services (AWS)

Ans. On demand instance is normal instance means if you create first time so you can use on demand instance, in this instance you can create simple server like 2 gb RAM, 1 core CPU, GP2 30 GB SSD....etc.

and Reserved instance is you can create server and its reserved for 2-3 years and when you give back to this server on AWS they give you discount but on demand and reserved instance price are same.

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_{Like Discuss Correct / Improve AWS Ec2}

Q1983. 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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Q1984. 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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_{Like Discuss Correct / Improve cloud computing virtualization production support Google Cloud Platform (GCP)}

Q1985. What are the various security and access services provided by AWS ?

Amazon Web Services (AWS)

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Q1986. What are some of the computation services provided by AWS ?

Amazon Web Services (AWS)

Ans. EC2, EKS, EKC , Lambda

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Q1987. 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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Q1988. What are some of the storage and database services provided by AWS ?

Amazon Web Services (AWS)

Ans. Storage - S3, Glacier
Database - RDS, DynamoDB

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Q1989. Difference between Amazon RDS and Amazon DynamoDB ?

Amazon Web Services (AWS)

Ans. Amazon RDS provides relational database services whereas DynamoDb provide No SQL database services.

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Q1990. What is the purpose of JDP and JDK ?

Core Java

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Q1991. Explain debugging

Process

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Q1992. Explain Facade design pattern

Design

Ans. Single gateway of the entire application is called Facade Design Pattern.

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Q1993. 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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Q1994. What is composition ?

Core Java

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Sample Code for composition

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Q1995. 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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Q1996. In the Following code which foo will get called.

foo(Integer i){
}

foo(String s){
}

public static void main(){
passing foo(null);
}

Core Java

Ans. ambiguity error

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Q1997. Can you give a real life example of synchronization

Core Java

Ans. Intersection with traffic light

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Q1998. If you are given a Jar file , How can you go through it understand what it does

Ans. It depends on if the jar file has source files or not. If it does have , I can open it in an IDE. If not, I can try looking documentation online if it's a public library or framework. If it's not a public library and no source file available, We can use a decompiler to generate source files from compiled class files.

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Q1999. 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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Q2000. When do you use a Vector?

Core Java

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Q2001. What is Overriding ?

Core Java

Ans. Overriding refers to the Methods with same name and parameters, such that the later over rides the former method.

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Q2002. What is abstraction ?

Core Java

Ans. The process of hiding the implementation details from the user and providing only functionality.

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Q2003. 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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Q2004. 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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Q2005. What are the benefits of using AWS Lambda over EC2 ?

Amazon Web Services (AWS)

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Q2006. 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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Q2007. 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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Q2008. What are the characteristics of the object ?

Core Java

Ans. 1. State

Instance variable or member elements forms the object state.

2. Behavior

Member functions forms the object behavior

3. Identity

Every object has a unique identity within JVM through a unique Id.

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Q2009. How is RDBMS different from DBMS ?

Database

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Q2010. How can we make objects if the constructor is private ?

Core Java

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