DBS Java Backend Interview Preparation Guide
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DBS Backend Interview Preparation Guide § § § Prepare 3 minutes introduction – brief about yourself, your current project – what problem it solved, your key technical skills. List down some of the key challenges you faced in your projects and how you helped to solve it. Object Oriented Principles – Abstraction, Encapsulation, Inheritance and Polymorphism. Must be able to demonstrate these principles with examples / scenarios. Type of polymorphism. Association, aggregation and composition. https://beginnersbook.com/2013/04/runtime-compile-time-polymorphism/ https://www.geeksforgeeks.org/dynamic-method-dispatch-runtime-polymorphism-java/ https://beginnersbook.com/2013/05/aggregation/ https://www.geeksforgeeks.org/overloading-in-java/ § Core Java - Collections (List, Map and Set), hashcode () and equals (), mutable vs immutable objects, how to create immutable objects. HashMap and ConcurrentHashMap differences, Exception handling in Java, Serialization, Threads concepts, heap dump analysis etc. https://crunchify.com/hashmap-vs-concurrenthashmap-vs-synchronizedmap-how-a-hashmap-can-be-synchronized-in-java/ http://javahungry.blogspot.com/2014/02/hashmap-vs-concurrenthashmap-java-collections-interview-question.html https://www.baeldung.com/java-exceptions-interview-questions https://javarevisited.blogspot.com/2013/06/10-java-exception-and-error-interview-questions-answers-programming.html http://tutorials.jenkov.com/java-concurrency/race-conditions-and-critical-sections.html https://www.baeldung.com/java-volatile https://jorosjavajams.wordpress.com/volatile-vs-synchronized/ https://java2blog.com/java-serialization-interview-questions-and-answers/ https://www.journaldev.com/349/java-classloader https://betsol.com/2017/06/java-memory-management-for-java-virtual-machine-jvm/ https://stackoverflow.com/questions/1440134/when-should-a-class-be-comparable-and-or-comparator https://www.geeksforgeeks.org/java-util-hashmap-in-java/ http://coding-geek.com/how-does-a-hashmap-work-in-java/ https://www.youtube.com/watch?v=Nr56SlbMed4 https://www.journaldev.com/1058/deadlock-in-java-example https://googleads.g.doubleclick.net/aclk?sa=L&ai=C8np_FVhrW73vJpKIoAPWkbuABqXVnbEFjdzCup8Cpp6tjWsQAiCl7NQcKAhg5erjA8gBAagD AcgDAqoEwgFP0K7JH02NAReQcpL1oY9AS4rBfdBje-XbETIK3Iscq9CZkOGJ4j6x4ys5ry-nlibK0619IGYRNrkKxtDz1esOm5HYvyp681d2qEjtIPoksPNvlZ_RemifMh5lMNqs5oVWbraqfo9Jgev57pTogW63uo0PoSuVqLsiEMKvmgRmWw1_V_URwquFB3RmNefwZX0ks8T6MkWBcSWDoDrZoFfz22z1x 5DCkMVXfa0Qx6hJNz8C6SpOZLB8Xfb0Vab4zF9qAGRcAGC4AH5ffiNagHjs4bqAfVyRuoB9nLG6gHz8wbqAemvhuoB5jOG9gHAdIIBwiAARABG AKACgE&num=2&sig=AOD64_1od9u4UjZlHeLpO2h1cVSOaAmenA&adurl=https://www.journaldev.com/1162/java-multithreadingconcurrency-interview-questions-answers http://mrbool.com/working-with-java-executor-framework-in-multithreaded-application/27560 https://www.journaldev.com/129/how-to-create-immutable-class-in-java https://www.journaldev.com/2529/jdbc-interview-questions-and-answers https://blogs.oracle.com/poonam/about-g1-garbage-collector,-permanent-generation-and-metaspace https://blog.codecentric.de/en/2008/07/memory-analysis-part-1-obtaining-a-java-heapdump/ https://dzone.com/articles/memory-analysis-how-to-obtain-java-heat-dump https://javarevisited.blogspot.com/2015/01/top-20-string-coding-interview-question-programming-interview.html § Java 8 – Functional Interface, Lambdas, Stream, Optional and Method References etc. https://medium.freecodecamp.org/learn-these-4-things-and-working-with-lambda-expressions-b0ab36e0fffc https://www.journaldev.com/2774/java-8-stream https://javabrains.io/courses/java_lambdabasics/lessons/Introduction-To-Streams https://www.javatpoint.com/java-8-stream https://www.journaldev.com/2752/java-8-interface-changes-static-method-default-method http://www.java2s.com/Tutorials/Java/Stream_How_to/IntStream/Use_lambda_to_check_if_a_integer_is_a_prime_number.htm https://www.journaldev.com/10081/javase8-interview-questions-part2 § Solid Principles https://www.youtube.com/watch?v=t86v3N4OshQ § Hibernate https://www.thoughts-on-java.org/complete-guide-inheritance-strategies-jpa-hibernate/ https://codingcompiler.com/hibernate-interview-questions-answers/ https://howtodoinjava.com/hibernate/complete-hibernate-query-language-hql-tutorial/ https://dzone.com/articles/all-about-hibernate-second https://www.journaldev.com/2969/hibernate-caching-first-level-cache § SQL http://a4academics.com/interview-questions/53-database-and-sql/397-top-100-database-sql-interview-questions-and-answers-examples-queries https://www.c-sharpcorner.com/article/most-asked-sql-queries-in-interview-questions/ https://www.youtube.com/watch?v=2HVMiPPuPIM https://community.modeanalytics.com/sql/tutorial/sql-performance-tuning/ § Spring / Spring Boot and Rest https://www.baeldung.com/spring-interview-questions https://intellipaat.com/interview-question/spring-interview-questions/ http://candidjava.com/tutorial/spring-boot-interview-questions/ https://www.techbeamers.com/rest-api-interview-questions-answers/ https://dzone.com/articles/spring-transactional-amp-exceptions https://www.baeldung.com/exception-handling-for-rest-with-spring § Unit Testing https://mindmajix.com/junit-interview-questions https://www.baeldung.com/junit-5 https://www.javacodegeeks.com/2014/09/mockito-101.html § Design Patterns Singleton, Factory, Abstract Factory, Builder, Observer, Decorator § CI/CD ( Overview of Jenkins,Sonar,code coverage, smells etc.) https://www.youtube.com/watch?v=p7-U1_E_j3w https://www.xoriant.com/blog/mobility/introduction-sonarqube.html https://blog.codinghorror.com/code-smells/ https://www.javaworld.com/article/2074515/core-java/unit-test-code-coverage-with-maven-and-jacoco.html § Others https://www.youtube.com/watch?v=Hbt56gFj998 http://bigocheatsheet.com/ https://www.geeksforgeeks.org/bubble-sort/ http://interactivepython.org/courselib/static/pythonds/SortSearch/TheMergeSort.html
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