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Design - Interview Questions and Answers for 'Time' - 3 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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Related Questions

 What is the difference between = and == in Java ?
 How is == operator different for objects and primitive types ?
 What will be the output of following code

Integer x = 1;
Integer y = 2;
System.out.println(x == y);

What if you change 1 to "1" and Integer to String?


Almost sure to be asked in every company using any Dependency Injection framework ( Spring, Guice etc )
  Q2. What is Dependency Injection or IOC ( Inversion of Control ) ?Design
Ans. It is a Design Pattern that facilitates loose coupling by sending the dependency information ( object references of dependent object ) while building the state of the object. Objects are designed in a manner where they receive instances of the objects from other pieces of code, instead of constructing them internally and hence provide better flexibility.

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   Like         Discuss         Correct / Improve     design patterns   ioc ( Inversion of Control )  dependency injection     Asked in 83 Companies      intermediate        frequent


Related Questions

 What are the benefits of Dependency Injection or IOC ?
 What are different types of dependency injections ?
  Name few Dependency Injection frameworks ?
 Why do we need polymorphism in Java ?
  What are the various Auto Wiring types in Spring ?
  What is the difference betweeen @Inject and @Autowired ?
 Which of the following Java features facilitates Dependency Injection - Inheritance or Composition ?
 What are the different ways in which dependency injection can be done using Spring Framework ?
 Difference between constructor and setter injection ?


Very frequently asked.Usually among first few questions.
  Q3. 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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   Like         Discuss         Correct / Improve     j2ee   mvc   mvc design pattern   design pattern   struts   spring   web application   web frameworks   ebay     Asked in 60 Companies      basic        frequent

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Related Questions

  Explain Flow of Spring MVC ?
  What are the benefits of using Spring Framework ?
  Why Struts 1 Classes are not Thread Safe whereas Struts 2 classes are thread safe ?
  What bean scopes does Spring support? Explain them.
  Which MVC is struts2 based on ?
  What are different modules of spring ?
  What is Spring configuration file?
  Q: What is default scope of bean in Spring framework?
  What is bean auto wiring?


 Q4. Runtime Polymorphism in Java is achieved through ..Core Java
a. Method Overloading
b. Method Overriding
c. Variable Overloading
d. Variable Overriding

Ans.b. Method Overriding


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