Difference between HashTAble and HashMAp. What are comparable ANd comparator. What is Spring actuator? what are microservices? How you create immutable classes in java? What is singleton pattern? What are Enums? Why should we use ENums? Do you know any caching framework like Redis? What is CICD process? What is pipeline? Jenkins, GIT,etc.

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Difference between HashTAble and HashMAp. What are comparable ANd comparator. What is Spring actuator? what are microservices?  How you create immutable classes in java? What is singleton pattern? What are Enums? Why should we use ENums? Do you know any caching framework like Redis? What is CICD process? What is pipeline? Jenkins, GIT,etc.

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