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Ans. DELETE FROM TABLE WHERE ROW_NUM NOT IN ( SELECT MAX(ROW_ID) FROM TABLE GROUP BY DUPLICATE_FIELD ) or DELETE FROM TABLE a WHERE ROW_ID >(SELECT MIN(ROW_ID FROM TABLE b WHERE a.DUPLICATE_FIELD=b.DUPLICATE_FIELD); | ||||
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Ans. 1. Arrays don't provide any built in support for sorting searching like operation and we need to do it explicitly. 2. It can hold only homogeneous objects, 3. We have to reserve memory as no dynamic expansion allowed. | ||||
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Like Discuss Correct / Improve  arrays  arraylist  arrays vs arraylist Asked in 3 Companies | ||||
Very frequently asked. Usually among very first few questions. | ||||
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Ans. Encapsulation is a feature of OOP's that binds the data and it's associated methods together as a single unit and facilitate protection and data hiding by providing minimal interface to outside. For example - member variables are declared private and are accessed through public methods. Moreover we have private methods that can only be used internally and hence providing minimal interface to outside class through use of public methods. | ||||
Sample Code for encapsulation | ||||
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Like Discuss Correct / Improve  encapsulation  object oriented programming (oops)  oops concepts  oops  oops concepts  oops features Asked in 4 Companies Basic   frequent | ||||
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Ans. You can implement encapsulation in Java by keeping the fields (class variables) private and providing public getter and setter methods to each of them. Java Beans are examples of fully encapsulated classes. Encapsulation in Java: Restricts direct access to data members (fields) of a class. | ||||
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Like Discuss Correct / Improve  oops  oops example  oops concepts  oops features Asked in 2 Companies basic   frequent | ||||
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Ans. Generics are a facility of generic programming that were added to the Java programming language in 2004 within J2SE5.0. They allow "a type or method to operate on objects of various types while providing compile-time type safety. | ||||
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Like Discuss Correct / Improve  generics Asked in 7 Companies | ||||
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Ans. We can have 2 entities i.e EMPLOYEE and ADDRESS and can have a relationship Table , EMPLOYEE_ADDRESS having one to may relationship between the two. | ||||
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Like Discuss Correct / Improve  database schema   design Asked in 2 Companies | ||||
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Ans. The Java collections framework (JCF) is a set of classes and interfaces that implement commonly reusable collection data structures. Although referred to as a framework, it works in a manner of a library. The JCF provides both interfaces that define various collections and classes that implement them. | ||||
Sample Code for Map Sample Code for HashMap Sample Code for Treemap Sample Code for set Sample Code for hashset Sample Code for treeset Sample Code for list Sample Code for arraylist Sample Code for linkedlist Sample Code for queue Sample Code for priorityqueue Sample Code for concurrenthashmap Sample Code for vector Sample Code for stack | ||||
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Like Discuss Correct / Improve  collections Asked in 9 Companies basic   frequent | ||||
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Ans. The most effective and acceptable reasons for leaving your current job should be positive e.g. moving forward in your life or career | ||||
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Ans. https://www.geeksforgeeks.org/arrays-sort-in-java-with-examples/ | ||||
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Like Discuss Correct / Improve  array  sorting Asked in 16 Companies basic   frequent | ||||
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Ans. == compares values === is used in scripting languages for comparing two values as well as there data tpe. like in js,php. | ||||
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Like Discuss Correct / Improve  ==  ===  == vs === Asked in 13 Companies basic   frequent | ||||
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Ans. https://blog.timesunion.com/careers/the-10-most-important-personality-traits-for-career-success/633/ | ||||
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Ans. Core technologies: dependency injection, events, resources, i18n, validation, data binding, type conversion, SpEL, AOP. Testing: mock objects, TestContext framework, Spring MVC Test, WebTestClient. Data Access: transactions, DAO support, JDBC, ORM, Marshalling XML. Spring MVC and Spring WebFlux web frameworks. Integration: remoting, JMS, JCA, JMX, email, tasks, scheduling, cache. Languages: Kotlin, Groovy, dynamic languages. | ||||
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Ans. table per hierarchy table per concrete class table per sub class | ||||
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Like Discuss Correct / Improve  hibernate mapping  hibernate associations Asked in 4 Companies | ||||
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Ans. By using assertNotNull(employee_address) | ||||
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Ans. use collections.frequency() method to find out the frequency, if it is greater than 1 then it is a duplicate element. | ||||
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Ans. It gives us the liberty to throw the specific exceptions which are required and also we can control the handling of exceptions | ||||
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Like Discuss Correct / Improve   Asked in 1 Companies | ||||