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confusion matrix , k fold class, regression ,classification report, precision recall , f1 score, support

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Data visualization tool to learn for data science- apache airflow,    Pentaho, QlikView, Tableau, data reporting   4+ years experience as a Data Engineer in companies with strong data culture 4+ years of professional, hands-on experience with Python development 4+ years of professional experience with relational databases (Postgres preferred) Setup and maintenance of DWH, especially data lakes and analytics within AWS, GCP, Snowflake Experience with RESTful API oriented design and modular service-oriented architecture Significant experience using AWS Cloud services and architectures, including S3, EC2, VPCs, ECS, RDS, DMS Experience measuring data ingestion quality Experience running infrastructure as code (e.g. Terraform, Ansible, CloudFormation) Orchestration tools - Airflow or Luigi Fluency in using Git Experience working in an Agile environment Experience with Snowflake Experience with monitoring and logging tools (like Prometheus, and Grafana) Experience with NoSQL c...
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Java8 Collectors mapping and joining function usages

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1.         What is annotation in java? Writing custom annotations and internal working of annotations. 2.         What is Generics in java? Wildcards in generics and writing the custom Generic class (Generic Use) 3.         What are the different collections you have used in your previous projects? Internal working of HashMap, TreeMap and PriorityQueue. 4.         What are Fail-Safe and Fail-Fast mechanism of iterators? 5.         What is volatile and differences between Atomic Classes (AtomicInteger, AtomicDouble) and volatile. 6.         What is Lock interface and its implementation and how lock is different from synchronized keyword. 7.         What are the blocked collections in java? 8.         Differences ...
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Java Interview Question

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1.Can we access instance variables within static methods ? 2.Difference between shallow cloning and deep cloning of objects? 3.What happens if one of the members in a class does not implement Serializable interface?   4.How garbage collector knows that the object is not in use and needs to be removed? 5.What is daemon thread?    6.What is the difference between a REST web service and a SOAP web service?   7. Difference between @Secured vs @RolesAllowed vs @PreAuthorize in Spring Security? 8.Explain the RowCallbackHandler in Spring?   9.What are the differences between forward() and sendRedirect() methods in Servlet?   10.How to execute stored procedure in hibernate 11.Write a Java program to remove duplicate elements from an arraylist without using collections (without using set) 12.Write a program to convert a string array to arraylist? 13.Write a program for Bubble Sort in java. 14.Write a program to g...
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JPA JPQL advantages and disadvantage

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wrong side with this JPQL query content belongs to ibm developer site highly thanks to them for basic and detailed explanation- https://www.ibm.com/developerworks/library/j-typesafejpa/ The Java developer community has welcomed JPA since its introduction in 2006. The next major update of the specification — version 2.0 (JSR 317) — will be finalized later in 2009 (see  Resources ). One of the key features introduced in JPA 2.0 is the Criteria API, which brings a unique capability to the Java language: a way to develop queries that a Java compiler can verify for correctness at compile time. The Criteria API also includes mechanisms for building queries dynamically at run time. This article introduces the Criteria API and the closely associated  metamodel  concept. You will learn how to use the Criteria API to develop queries that a Java compiler can check for correctness to reduce run-time errors, in contrast to string-based Java Persistence Query Language (JPQ...
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