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Interview Questions and Answers - Order By Rating | |||||||||||
Very frequently asked. Among first few questions in almost all interviews. Among Top 5 frequently asked questions. Frequently asked in Indian service companies (HCL,TCS,Infosys,Capgemini etc based on multiple feedback ) and Epam Systems | |||||||||||
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Ans. "equals" is the method of object class which is supposed to be overridden to check object equality, whereas "==" operator evaluate to see if the object handlers on the left and right are pointing to the same object in memory. x.equals(y) means the references x and y are holding objects that are equal. x==y means that the references x and y have same object. Sample code: String x = new String("str"); String y = new String("str"); System.out.println(x == y); // prints false System.out.println(x.equals(y)); // prints true | |||||||||||
Sample Code for equals | |||||||||||
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Like Discuss Correct / Improve  java   string comparison   string   object class   ==   equals   object equality  operator   == vs equals   equals vs == Asked in 294 Companies basic   frequent | |||||||||||
Try 6 Question(s) Test | |||||||||||
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Ans. Within message.properties file. | |||||||||||
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Like Discuss Correct / Improve  j2ee   web application   struts   spring Asked in 1 Companies | |||||||||||
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Ans. Spring enables developers to develop enterprise-class applications using POJOs. The benefit of using only POJOs is that you do not need an EJB container product. Spring is organized in a modular fashion. Even though the number of packages and classes are substantial, you have to worry only about ones you need and ignore the rest. Spring does not reinvent the wheel instead, it truly makes use of some of the existing technologies like several ORM frameworks, logging frameworks, JEE, Quartz and JDK timers, other view technologies. Testing an application written with Spring is simple because environment-dependent code is moved into this framework. Furthermore, by using JavaBean-style POJOs, it becomes easier to use dependency injection for injecting test data. Spring is web framework is a well-designed web MVC framework, which provides a great alternative to web frameworks such as Struts or other over engineered or less popular web frameworks. Spring provides a convenient API to translate technology-specific exceptions (thrown by JDBC, Hibernate, or JDO, for example) into consistent, unchecked exceptions. Lightweight IoC containers tend to be lightweight, especially when compared to EJB containers, for example. This is beneficial for developing and deploying applications on computers with limited memory and CPU resources. Spring provides a consistent transaction management interface that can scale down to a local transaction | |||||||||||
Sample Code for spring | |||||||||||
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Like Discuss Correct / Improve  java   spring framework   mvc   spring container   architecture   technical architect   java architect   technical lead  ioc Asked in 2 Companies basic   frequent | |||||||||||
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Ans. Java Beans managed by Spring IoC are called Spring Beans. | |||||||||||
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Like Discuss Correct / Improve  java   spring   beans | |||||||||||
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Ans. There are seven core modules in spring Spring MVC The Core container O/R mapping DAO Application context Aspect Oriented Programming or AOP Web module | |||||||||||
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Recently asked in TCS , Tech Mahindra, HCL , Accenture and Fidelity. | |||||||||||
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Ans. The DispatcherServlet configured in web.xml file receives the request. The DispatcherServlet finds the appropriate Controller with the help of HandlerMapping and then invokes associated Controller. Then the Controller executes the logic business logic and then returns ModeAndView object to the DispatcherServlet. The DispatcherServlet determines the view from the ModelAndView object. Then the DispatcherServlet passes the model object to the View. The View is rendered and the Dispatcher Servlet sends the output to the Servlet container. Finally Servlet Container sends the result back to the user. | |||||||||||
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Like Discuss Correct / Improve  j2ee   spring   mvc   frameworks   web applications   architecture Asked in 11 Companies Basic   frequent | |||||||||||
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Ans. Spring configuration file is an XML file. This file contains the classes information and describes how these classes are configured and introduced to each other. | |||||||||||
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Like Discuss Correct / Improve  j2ee   spring   mvc   frameworks   web applications   spring configuration file Asked in 1 Companies | |||||||||||
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Ans. The default scope of bean is Singleton. | |||||||||||
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Ans. The Spring Framework supports following five scopes - Singleton prototype request session global-session | |||||||||||
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Like Discuss Correct / Improve  j2ee   spring   mvc   frameworks   web applications   beans   beans scope   at&t  fidelity | |||||||||||
Very Frequently asked Spring question. | |||||||||||
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Ans. The Spring container is able to autowire relationships between collaborating beans. This means that it is possible to automatically let Spring resolve collaborators (other beans) for your bean by inspecting the contents of the BeanFactory without using | |||||||||||
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Like Discuss Correct / Improve  j2ee   spring   mvc   frameworks   web applications   autowiring   beans   at&t   ge Asked in 9 Companies   frequent | |||||||||||
Very frequently asked.Usually among first few questions. | |||||||||||
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Ans. MVC is a Design Pattern that facilititates loose coupling by segregating responsibilities in a Web application 1. Controller receives the requests and handles overall control of the request 2. Model holds majority of the Business logic, and 3. View comprise of the view objects and GUI component | |||||||||||
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Like Discuss Correct / Improve  j2ee   mvc   mvc design pattern   design pattern   struts   spring   web application   web frameworks   ebay Asked in 60 Companies basic   frequent | |||||||||||
Try 1 Question(s) Test | |||||||||||
Frequently asked in Phone Interviews. | |||||||||||
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Ans. Singleton , Prototype , Request , Session , global-session | |||||||||||
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Like Discuss Correct / Improve  spring framework   bean scope   general electric   ge | |||||||||||
Frequently asked in Phone Interviews. | |||||||||||
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Ans. By Name , By Type and Constructor. | |||||||||||
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Like Discuss Correct / Improve  java   spring   spring container   dependency injection   auto wiring   auto wiring types   general electric   ge | |||||||||||
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Ans. We should use singleton scope for beans when they are stateless and prototype when they are stateful. | |||||||||||
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Like Discuss Correct / Improve  spring   bean scope   general electric   ge  singleton | |||||||||||
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Ans. I like Spring as it comes with inbuilt Dependency Injection framework. It has great online community and support and is proven to work well with ORMs like Hibernate. If we are not working with ORM and DI, Struts 2 is also good. | |||||||||||
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Like Discuss Correct / Improve  spring   struts   project lead   technical lead   techical architect | |||||||||||
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Ans. @Autowired and @Inject are similar in terms of functionality they achieve. @Inject is part of a new Java technology called CDI that defines a standard for dependency injection whereas @Autowired is a Spring specific annotation for dependency injection. | |||||||||||
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Like Discuss Correct / Improve  spring   web frameworks   dependency injection   autowired   inject   spring annotations   ioc | |||||||||||
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Ans. No, if required we should only have final variables.Bean scoped singleton means that only one instance of the bean will be created and will be shared among different requests and hence instance variables will get shared too. | |||||||||||
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Like Discuss Correct / Improve  java   singleton   spring framework   spring beans | |||||||||||
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Ans. Spring caching makes use of its intercepting capabilities to add caching to method calls. Therefore, the entire object is cached and reused. Hibernate, on the other hand, has more domain-specific knowledge of the Entity being cached and can handle the objects more appropriately. | |||||||||||
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Like Discuss Correct / Improve  spring framework   hibernate   spring cache   hibernate cache | |||||||||||
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Ans. All of the Above | |||||||||||
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Like Discuss Correct / Improve  spring   spring beans   spring bean scope | |||||||||||
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Ans. ApplicationContextAware | |||||||||||
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Like Discuss Correct / Improve  spring   applicationcontext   application context   applicationcontextaware | |||||||||||
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Ans. Controller | |||||||||||
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Like Discuss Correct / Improve  spring frmaework   spring mvc   rest   webservices | |||||||||||
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