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This question was recently asked at 'HCL Technologies'.This question is still unanswered. Can you please provide an answer. | ||||
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Ans. Every fresh session having its own cache memory, Caching is a mechanism for storing the loaded objects into cache memory. The advantage of cache mechanism is, whenever again we want to load the same object from the database then instead of hitting the database once again, it loads from the local cache memory only, so that the no. of round trips between an application and a database server got decreased. It means caching mechanism increases the performance of the application. In hibernate we have two levels of caching First Level Cache [ or ] Session Cache Second Level Cache [ or ] Session Factory Cache [ or ] JVM Level Cache | ||||
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This question was recently asked at 'Ray Business Technologies'.This question is still unanswered. Can you please provide an answer. | ||||
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Ans. Yes | ||||
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This question was recently asked at 'Naresh i Technologies'.This question is still unanswered. Can you please provide an answer. | ||||
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Ans. The architecture of a Spring Boot project can be divided into three layers: Presentation Layer: This layer is responsible for handling user requests and generating responses. It includes the user interface, which can be a web UI or a RESTful API. Spring Boot provides various options to develop web applications, such as Spring MVC, Thymeleaf, and others. Service Layer: This layer contains the business logic of the application. It is responsible for processing the user requests and generating responses. The Service Layer interacts with the Data Access Layer to fetch and store data. Data Access Layer: This layer is responsible for interacting with the database or any other external data source. It includes the database model, repositories, and data access objects. Spring Boot provides support for various data access technologies, such as JPA, JDBC, and Spring Data JPA. | ||||
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This question was recently asked at 'naresh i technologies'.This question is still unanswered. Can you please provide an answer. | ||||
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Ans. Java provides its own implementations of the thread pool pattern, through objects called executors. These can be used through executor interfaces or directly through thread pool implementations which does allow for finer-grained control. The java.util.concurrent package contains the following interfaces: Executor : a simple interface for executing tasks.ExecutorService a more complex interface which contains additional methods for managing the tasks and the executor itself. ScheduledExecutorService: extends ExecutorService with methods for scheduling the execution of a task.Alongside these interfaces, the package also provides the Executors helper class for obtaining executor instances, as well as implementations for these interfaces. Generally, a Java thread pool is composed of: The pool of worker threads, responsible for managing the threads. A thread factory that is responsible for creating new threads. A queue of tasks waiting to be executed. | ||||
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Ans. Yes | ||||
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This question was recently asked at 'oodless technologies'.This question is still unanswered. Can you please provide an answer. | ||||
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Ans. Assigning a value of one type to a variable of another type is known as Type Casting. Example : int x = 10; byte y = (byte)x; In Java, type casting is classified into two types, Widening Casting(Implicit) widening-type-conversion and Narrowing Casting (Explicitly done) narrowing-type-conversion. Widening or Automatic type converion - Automatic Type casting take place when,the two types are compatible and the target type is larger than the source type Example : public class Test { public static void main(String[] args) { int i = 100; long l = i; //no explicit type casting required float f = l;//no explicit type casting required System.out.println("Int value " i); System.out.println("Long value " l); System.out.println("Float value " f); } } Narrowing or Explicit type conversion - When you are assigning a larger type value to a variable of smaller type, then you need to perform explicit type casting. Example : public class Test{ public static void main(String[] args) { double d = 100.04; long l = (long)d; //explicit type casting required int i = (int)l;//explicit type casting required System.out.println("Double value " d); System.out.println("Long value " l); System.out.println("Int value " i); } } | ||||
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Ans. Both Arrays and ArrayLists are used to store elements. Elements can be either primitives or objects in case of Arrays, but only objects can be stored in Arraylist. Array is a fixed length data structure while arraylist is variable length collection class. Once created, you cannot change the size of the arrays, but arraylists can dynamically resize itself when needed.Another notable difference between Arrays and Arrayslist is that arary is part of core java programming and array list is part of collection classes | ||||
Sample Code for arrays arraylist | ||||
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Like Discuss Correct / Improve  array  arraylist  array vs arraylist Asked in 7 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. OAuth is an open-standard authorization protocol or framework that describes how unrelated servers and services can safely allow authenticated access to their assets without actually sharing the initial, related, single logon credential. Like using Google or Facebook to login to something. | ||||
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Ans. Encrypted User Name / Password Encrypted Password within Cookie Encrypted Tokens IP Client Certificates Oauth | ||||
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Like Discuss Correct / Improve  authentication  security  web service Asked in 12 Companies basic   frequent | ||||
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Ans. OSGI is open service gateway initiative, its used as java framework for developing and deploying the modular softwares. | ||||
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This question was recently asked at 'HCL Technologies,Symantec'.This question is still unanswered. Can you please provide an answer. | ||||
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Ans. WEB APP |WEB-INF - META-INF | | | META-INF.MF | lib - WEB.xml - Classes | ||||
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Like Discuss Correct / Improve  web application Asked in 3 Companies intermediate   frequent | ||||
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Ans. No | ||||
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Like Discuss Correct / Improve  abstract class   multiple inheritance  object oriented programming (oops)  oops concepts Asked in 2 Companies | ||||
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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://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. TreeSet contains only values as elements whereas TreeMap contains Key value pairs. | ||||
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Like Discuss Correct / Improve  reeMap  TreeSet  Collections  sorted collection Asked in 1 Companies   rare | ||||
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Ans. Setter Injection in Spring is a type of dependency injection in which the framework injects the dependent objects into the client using a setter method. | ||||
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This question was recently asked at 'Spillman Technologies'.This question is still unanswered. Can you please provide an answer. | ||||
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This question was recently asked at 'Spillman Technologies'.This question is still unanswered. Can you please provide an answer. | ||||
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Ans. We can use Singleton Design Pattern. | ||||
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Ans. I was always fascinated by mathematics and statistics and hence chose programming as I found It to be fit ground for utilizing those skills. | ||||
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This question was recently asked at 'Newgen technologies'.This question is still unanswered. Can you please provide an answer. | ||||
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Ans. The @Import annotation is used to import one or more @Configuration classes. This annotation provides the functionality equivalent to element in xml based configuration. The @ImportResource annotation is used to import one or more XML configuration files. | ||||
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This question was recently asked at 'Aloha Technologies'.This question is still unanswered. Can you please provide an answer. | ||||
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