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| Interview Questions and Answers - Order By Newest | ||||
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| Ans. Advantages - Much Cheaper Continuous scaling Higher level and Serverless Disadvantages - Warm up time Limited flexibility in terms of technologies Limited control | ||||
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 Discuss Correct / Improve  aws lambda aws serverless computing amazon cloud serverless computing amazon lambda aws ec2 aws computing amazon cloud computing amazon ec2 | ||||
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| Ans. Yes | ||||
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| Discuss Correct / Improve aws efs volume aws ec2 aws computing amazon cloud computing amazon ec2 | ||||
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| Ans. Api Gateway Alexa CloudFront CloudWatch Code Commit Kinesis S3 SNS | ||||
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| Discuss Correct / Improve aws lambda aws serverless computing amazon cloud serverless computing amazon lambda trigger | ||||
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| Ans. Route is for routing which is the purpose of DNS and Default port for DNS is 53 | ||||
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| Discuss Correct / Improve aws route53 | ||||
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| Ans. Automated Backups are deleted automatically whereas Snapshots are preserved. Upon terminating RDS instance , AWS gives a warning about that and requests to create a final snapshot before terminating the instance. | ||||
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| Discuss Correct / Improve aws rds aws database amazon cloud database | ||||
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| Ans. Configure it while creating EC2 instance only | ||||
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Discuss Correct / Improve aws security groups  Asked in 1 Companies | ||||
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| Ans. Adding more security group, it works like a firewall | ||||
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| Discuss Correct / Improve aws ec2 aws computing amazon cloud computing amazon ec2 aws ebs volume snapshot Asked in 1 Companies | ||||
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| Ans. Attaching Volumes ( EBS / EFS ) on AWS Computing ( EC2, EKS ) | ||||
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| Discuss Correct / Improve aws ebs aws efs aws ec2 aws computing amazon cloud computing amazon ec2 aws eks | ||||
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| Ans. No, it should be public as cloudfront doesn't have a way to access private ELB. | ||||
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| Discuss Correct / Improve aws elb amazon elb aws cloudfront amazon cloudfront | ||||
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| Ans. High bandwidth and availability in NAT Gateway NAT Gateway is completely managed by AWS NAT Gateway is auto scalable NAT Instance is just like EC2 instance and hence backed by security group NAT Instance can be used as bastion host whereas NAT Gateway cannot be. | ||||
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| Discuss Correct / Improve aws nat instance aws nat gateway | ||||
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| Ans. 1. Fault Tolerance 2. Better Access by bringing the application closer to the users. | ||||
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| Discuss Correct / Improve Google Cloud Computing (GCP) Amazon Web Services (AWS) Availability Zones Regions and Zones Infrastructure | ||||
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| Discuss Correct / Improve Amazon Web Services (AWS) Google Cloud Platform (GCP) | ||||
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| Ans. Swing provides both additional components like JTable, JTree etc and added functionality to AWT-replacement components. Swing components can change their appearance based on the current “look and feel†library that’s being used. Swing components follow the MVC paradigm, and thus can provide a much more flexible UI. Swing provides extras for components, such as icons on many components, decorative borders for components, tool tips for components etc. Swing components are lightweight than AWT. Swing provides built-in double buffering ,which means an off-screen buffer is used during drawing and then the resulting bits are copied onto the screen. Swing provides paint debugging support for when you build your own component. | ||||
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| Discuss Correct / Improve java awt java ui swing difference between swing and awt architecture | ||||
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| Ans. public void init() public void start() public void stop() public void destroy() | ||||
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| Discuss Correct / Improve java java ui applet swing awt | ||||
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| Ans. In GUI programming, an object that can be registered to be notified when events of some given type occur. The object is said to listener? for the events. | ||||
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| Discuss Correct / Improve java gui ui programming swing awt swt listener architecture | ||||
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| Ans. Applet is a dynamic and interactive program that runs inside a web page displayed by a java capable browser. Lifecycle methods of Applet - init( ) method - Can be called when an applet is first loaded start( ) method - Can be called each time an applet is started paint( ) method - Can be called when the applet is minimized or maximized stop( ) method - Can be used when the browser moves off the applet's page destroy( ) method - Can be called when the browser is finished with the applet | ||||
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| Discuss Correct / Improve java java ui applet swing awt lifecycle of applet technologies | ||||
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| Ans. Controls are components that allow a user to interact with your application and SWT / AWT supports the following types of controls: Labels, Push Buttons, Check Boxes, Choice Lists, Lists, Scrollbars, Text Components. These controls are subclasses of Component. | ||||
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| Discuss Correct / Improve java java ui swt awt types of controls | ||||
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| Ans. http://www.cyberciti.biz/faq/key-differences-between-tcp-and-udp-protocols/ | ||||
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| Discuss Correct / Improve java network programming architecture Cloud Computing Google Cloud Computing (GCP) Amazon Web Services (AWS) Asked in 3 Companies | ||||
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| Ans. ApplicationContextAware | ||||
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| Discuss Correct / Improve spring applicationcontext application context applicationcontextaware | ||||
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| Ans. [Open Ended Answer] | ||||
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Discuss Correct / Improve elsevier open ended questions overstock.com cerner Asked in 15 Companies  frequent | ||||
 Frequently asked in face to face interviews. | ||||
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| Ans. int count = 15; int[] fibonacci = new int[count]; fibonacci[0] = 0; fibonacci[1] = 1; for(int x=2; x < count; x++){ fibonacci[x] = fibonacci[x-1] + fibonacci[x-2]; } for(int x=0; x< count; x++){ System.out.print(fibonacci[x] + " "); } | ||||
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Discuss Correct / Improve ebay fibonacci series Asked in 66 Companies  basic frequent | ||||
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| Ans. Audit Tables generally stores Raw information to be reviewed in case of problems or determining impact. If Database space is an issue , and the audit information is rarely retrieved, one design could be to use compressed file system. | ||||
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| Discuss Correct / Improve databases audit tables raw transaction information storage Asked in 1 Companies | ||||
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| Ans. Abstraction, Encapsulation, Polymorphism , Composition and Inheritance | ||||
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| Discuss Correct / Improve core oops concepts Asked in 65 Companies basic frequent | ||||
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| Ans. The projects aims to organize the Java source code into independent modules and hence facilitate building them independently.So now we will have multiple core java jars instead of single one. This way of organizing the code would offer following advantages 1. Will make applications lighter as only required modules will be built with the application. Moreover there are some legacy packages currently which anyone hardly use. 2. Reuse same class whole identifiers across different modules. | ||||
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| Discuss Correct / Improve java 9 java9 project jigsaw | ||||
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| Ans. It means that now individual modules will be built independently instead of complete jdk built in a single jar file. So we will have multiple jars instead of single jar. Moreover this organization would result in lighter applications as they can just built themselves with the required jars and hence ignoring the not required and legacy modules. | ||||
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| Discuss Correct / Improve java 9 java9 project jigsaw | ||||
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| Ans. These are the platforms or set of services provided by Amazon for cloud services , database storage , content delivery and other business applications and solutions. | ||||
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| Discuss Correct / Improve aws amazon web service | ||||
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| Ans. Paas - Platform as a service Iaas - Infrastructure as a service Saas - Software as a service | ||||
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| Discuss Correct / Improve cloud computing Amazon Web Service (AWS) Google Cloud Platform (GCP) | ||||
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| Ans. Var args is the feature of Java that allows a method to have variable number of arguments. Var args are used when we are not sure about the number of arguments a method may need. Internally java treats them as array. Declarations of methods with var args void method(int... x){}; void method(int x, int... y){}; | ||||
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| Discuss Correct / Improve var args methods functions method declaration Asked in 2 Companies | ||||
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| Ans. Amazon Elastic Compute Cloud or EC2 provides scalable computing capacity in the AWS cloud. It can be used to create Virtual Environments , storage and configure. EC2 enables to upgrade or downgrade infrastructure according to the rules defined ( with fluctuation in latency, traffic etc ) | ||||
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| Discuss Correct / Improve aws aws ec2 aws computing amazon cloud computing amazon ec2 Elastic Compute Cloud Amazon Elastic Compute Cloud Asked in 2 Companies | ||||
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| Ans. EC2 is Amazon computing service whereas Elastic Beanstalk is the AWS service for deploying and managing web applications. | ||||
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| Discuss Correct / Improve Elastic Compute Cloud EC2 Elastic Beanstalk | ||||
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