\n\t1) Why ArrayList faster while searching than LinkedList
\n\t2) Time complexity of HashMap
\n\t3) Time complexity of ArrayList
\n\t4) Keeping an employee object as a key in hashmap without overriding equals and hashmap. Can we get an error?
\n\t5) What is View in Struts?
\n\t6) Explain end to end application for employee data from database using Angular and Spring?
\n\t7) Explain Jenkins configuration for a job?
\n\t \n<\/p>\n
\n\tBasic\/Minimum permissions required to connect S3 from Ec2 instance?
\n\tWhat is cloud formation?
\n\tCan we use the same subnet in different regions?
\n\tHow do you access the internet in private VPC network?
\n\tExplain ElasticBean Stack?
\n\tHow Ops configuration is different from doing through ElasticBeanStack?
\n\tExplain about VPC?
\n\tHow to get aws instance metadata?
\n\tThe advantage of versioning in S3?\n<\/p>\n
\n\tThe difference between String, StringBuilder and StringBuffer?
\n\tOverloading vs Overriding?
\n\tCan we override the main method?
\n\tExplain Singleton class?
\n\tWhen to use ArrayList vs LinkedList?
\n\tWhat is marker interface?
\n\tSpring dependency Injection?
\n\tExplain Spring AOP?
\n\tORM technologies?
\n\tExplain about Hibernate usage and advantages?\n<\/p>\n
\n\t– Difference between inteface and abstract class ?
\n\t– What is polymorphism, explain the different between runtime polymorphism vs compiletime polymorphism ?
\n\t– Difference between throw vs throws keywords?
\n\t– Explain Enum ?
\n\t– What is dry principle in java?
\n\t– Difference between hashmap vs concurrent hashmap?
\n\t– What is dependency injection ?
\n\t– ConcurrentHashMap vs SynchronizedHashMap
\n\t– Which two methods needs to override to implement your own hashmap ?
\n\t– Difference between Set vs List ?
\n\t– Default scope of bean in Spring Framework ?
\n\t– Explain dependency injection ?
\n\t– Mongo DB :
\n\t – How do you represent table in Mongo DB?
\n\t – How do you represent row in Mongo DB?
\n\t – How do you display data in very nice format after extracting from Mongo DB ?
\n\t – Explain query to select data from Mongo DB?
\n\t– Database :
\n\t – How do you fine tune your DB query ?
\n\t – How do you sync data between two databases ?
\n\t – Display all rows from table A by eliminating similar rows in table B
\n\t– Questions on synchronization ?
\n\t– Explain Genrics?
\n\t– What did you do with Redis ?
\n\t– How does in memory cache works?\n<\/p>\n
\n\t1) What <\/strong><\/span>are<\/strong><\/span> Generics in <\/span><\/strong>JAVA ?<\/strong><\/span><\/strong> \n\t2) <\/span> select<\/strong> <\/span><\/strong>query <\/strong>Optimization<\/strong>?<\/strong><\/span><\/strong> \n\t3) Many to Many <\/span><\/strong>implementation<\/strong><\/span> in <\/span><\/strong>sql<\/strong><\/span>?<\/strong><\/span><\/strong>\n<\/p>\n \n\t4) Spring bean <\/span><\/strong>scopes?<\/strong> \n\t5) What is dependency injection?<\/strong> \n\t6) Explain <\/span><\/strong>ThreadPoolExecutor ?<\/strong> \n\t8) Set vs <\/span><\/strong>List?<\/strong><\/span> \n\thttp:\/\/kaizen-koka.com\/2016\/01\/19\/collections\/<\/a>
\n\tAnswer: Generics add stability to your code by making more of your bugs detectable at compile time.
\n\t – Stronger type checks at compile time.
\n\t – Elimination of <\/span>casts<\/span>.
\n\t – The most commonly used type parameter names are:
\n\tE – Element (used extensively by the Java Collections Framework)
\n\tK – Key
\n\tN – Number
\n\tT – Type
\n\tV – Value<\/span>
\n\tS,U,V<\/span> etc. – 2nd, 3rd, 4th types
\n\tType inference is a Java compiler's ability to look at each method invocation and corresponding declaration to determine the type argument (or arguments) that make the invocation applicable. <\/span>\n<\/p>\n
\n\t – Create the <\/span>indexes<\/span>
\n\t – Only<\/span>Retrive<\/span> the data that you needed
\n\t – Avoid Functions on the<\/span>Left Hand-Side<\/span> of the Operator (Instead of WHERE DATEDIFF(MONTH, appointment_date, '2015-04-28') < 0; Do WHERE appointment_date > '2015-04-30')
\n\t – Consider Getting Rid of Correlated Subqueries (Instead of subqueries create joins)
\n\t – Avoid Wildcard Characters at the Beginning of a LIKE Pattern<\/span>\n<\/p>\n
\n\t singleton, prototype, request, session, global session
\n\t http:\/\/docs.spring.io\/spring\/docs\/3.0.0.M3\/reference\/html\/ch04s04.html<\/a>
\n\t Please be aware that Spring's concept of a singleton bean is quite different from the Singleton pattern as defined in the seminal Gang of Four (GoF) patterns book. The GoF Singleton hard codes the scope of an object such that one and only one instance of a particular class will ever be created per ClassLoader. The scope of the Spring singleton is best described as per container and per bean. This means that if you define one bean for a particular class in a single Spring container, then the Spring container will create one and only one instance of the class defined by that bean definition. The singleton scope is the default scope in Spring. To define a bean as a singleton in XML, you would write configuration like so:<\/span>\n<\/p>\n
\n\t – Dependency injection is basically providing the objects that an object needs (its dependencies) instead of having it construct them itself<\/span>\n<\/p>\n
\n\t Executor:
\n\t – The Concurrency API introduces the concept of an ExecutorService as a higher level replacement for working with threads directly. Executors are capable of running asynchronous tasks and typically manage a pool of threads, so we don't have to create new threads manually. All threads of the internal pool will be reused under the hood for revenant tasks, so we can run as many concurrent tasks as we want throughout the life-cycle of our application with a single executor service.
\n\thttp:\/\/winterbe.com\/posts\/2015\/04\/07\/java8-concurrency-tutorial-thread-executor-examples\/<\/a>
\n\t
\n\t7) How to make a <\/strong>class <\/strong><\/span>immutable<\/strong>?<\/strong><\/span><\/strong>
\n\t – Make all fields final and private & No public setter methods.
\n\t – Make class final
\n\t – Make a private constructor and add a public factory method.<\/span>\n<\/p>\n
\n\t – List allows duplicates &its an ordered collection
\n\t – Set doesn't allow duplicates & random order<\/span>\n<\/p>\n
\n\t <\/span>\n<\/p>\n