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Spring - Interview Questions and Answers for 'Infosys' - 7 question(s) found - Order By Newest

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
  Q1. Difference between == and .equals() ?Core Java
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
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Very frequently asked.Usually among first few questions.
  Q2. What is MVC ? Design
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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 Q3. What is the difference between Singleton and Prototype Bean scope in Spring ?Spring
Ans. Prototype scope - A new object is created each time it is injected/looked up. It will use new SomeClass() each time.

Singleton scope - It is the default scope. The same object is returned each time it is injected/looked up. Here it will instantiate one instance of SomeClass and then return it each time.

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   Like         Discuss         Correct / Improve     Spring beans  singleton bean scope  prototype bean scope     Asked in 1 Companies

Very Frequently asked Spring question.
  Q4. What is bean auto wiring?Spring
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 and elements.

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   Like         Discuss         Correct / Improve     j2ee   spring   mvc   frameworks   web applications   autowiring   beans   at&t   ge     Asked in 9 Companies        frequent

Frequently asked Spring interview question.
 Q5. What are the components of Spring framework ?Spring
Ans. Core: [Core, Bean, Context, Expression Language]

Web: [Web, Portlet, Servlet, etc]

Data Access [JMS, JDBC, etc]

AOP, Aspect

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   Like         Discuss         Correct / Improve     spring  spring framework components     Asked in 12 Companies

 Q6. Should we have instance variables in the Spring Bean which has been scoped as Singleton ?Spring
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     singleton     Asked in 1 Companies

 Q7. What is setter injection ?Spring
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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   Like         Discuss         Correct / Improve     setter injection   dependency injection     Asked in 2 Companies

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