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Interview Questions and Answers for 'Design' - 117 question(s) found - Order By Newest

next 40
Almost sure to be asked in every company using any Dependency Injection framework ( Spring, Guice etc )
  Q1. 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     Nucleus Software Exports  HCL Technologies  Tata Consultancy (TCS)  HCL  Infosys  Cognizant (CTS)  Barclays  General Electric  Infosys Technologies  Elsevier  Sabre  ZapCom  Nike  Sogeti  CSG International  Lowes  DWS  Mitsui Bussan Logistics  Payment Processing Partners  Liquidnet  AmTrust Financial  VectorForm  Cybage  Vanderbilt University  Cigniti  Accenture  Ball Aerospace  GE Healthcare  1-800 Contacts  VinSolutions  Arrow Electronics  Monitise  Avenue Code  Thetus Corporation  Shodogg  Levi9  BuildLinks  Suyati Technologies  Kanerika Software  Alliance Inspection Management  Promega  Victorious  Zoll Data Systems  Parkmobile  PerceptiMed  Crate and Barrel  Carbonite  Concur  Codazen  GlobalLogic  AccuSoft  Attinad  Tillster  AppRiver  TrustPilot  Pearson  Kony  Art Technology Group  VeriSign  Accion Labs  IGS Energy  National Bankruptcy Services  RealPage  Green Dot  Indecomm Global  bebo Technologies  Open Solutions  Xoriant  NCR  Macmillan Cancer Support  NetSuite  Asynchrony Labs  DealDash  Vizio  Fiserv  Federal Reserve Bank of Minneapolis  Tinder  FICO  Trustwave      intermediate        frequent


 Q2. Let's suppose we have an to destroy objects, Design a program to implement garbage collection ?Design2017-08-04 14:08:01

Ans. Step 1 - We can create a Registry Class having Map of all created objects as key and References list as value.

Step 2 - Whenever we create an object , we should update the Registry in the constructor to add the new object.

Step 3 - Whenever we assign a new reference to the object , we need to update the entry in Map. Similarly if the reference get's removed ( end of scope etc ), we need to remove the entry of reference from the list.

Step 4 - We can have threaded code to monitor the Map to see if any object looses all it's references and should call the method to destroy object and clean the memory.

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 Q3. What are the Wrapper classes available for primitive types ?Core Java
Anonymous
Ans. boolean - java.lang.Boolean
byte - java.lang.Byte
char - java.lang.Character
double - java.lang.Double
float - java.lang.Float
int - java.lang.Integer
long - java.lang.Long
short - java.lang.Short
void - java.lang.Void

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 Q4. Difference between Factory and Abstract Factory Design Pattern ?Design
Anonymous
Ans. Factory Pattern deals with creation of objects delegated to a separate factory class whereas Abstract Factory patterns works around a super-factory which creates other factories.

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Very frequently asked.Usually among first few questions.
  Q5. What is MVC ? Design
Anonymous
Ans. The Model/View/Controller pattern, a strategy for dividing responsibility in a GUI component.

The model is the data for the component.

The view is the visual presentation of the component on the screen.

The controller is responsible for reacting to events by changing the model.

According to the MVC pattern, these responsibilities should be handled by different objects.

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 Q6. If you are given a choice to implement the code to either Insert a Record or Update if already exist, Which approach will you follow ?

1. Insert into the DB Table. If exception occurs, update the existing record.
2. Check if the record exists and update it if it exists, If not insert a new record.
Solution
admin
info@buggybread.com
Ans. In first case, there would be 2 DB calls in worst case and 1 in best case. In 2nd approach there will be always 2 DB calls.

Decision on the approach should depend on the following considerations -

1. How costly is the call to DB ? Are we using indices , hibernate etc

If calls to DB are costly , 1st approach should be the choice.

2. Exception Book keeping load upon exception.

The benefit of saving 1st call in approach 1 should be bigger than the Book keeping for the exception.

3. Probability of the exception in first apparoach.

If the DB Table is almost empty, it makes sense to follow Approach 1 as majority of the 1st calls will pass through without exception.

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 Q7. In which cases , moving methods to utility class could be useful ?Core Java

Ans. It could be worthy to move a method to util class if the method needs to be shared, doesn't require polymorphic behavior and need not be overridden in special cases.

Don't belong to one group through is-a relationship ( You can share through parent class method )

Don't implement a specific interface ( java 8 default methods )

Doesn't involve complex computing as you will be loosing the benefit of object state with just static method.

Doesn't require polymorphic behavior as static methods don't participate in runtime polymorphism.

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   Like      Discuss      Correct / Improve     utility classes   util classes   static methods   application design        rare


 Q8. If you need to consume messages from the queue faster, which approach will you recommend - batching or concurrency ?Design2017-07-24 13:34:47

Ans. Each has it's own advantages

Batching requires less resources but may result in loosing whole batch in case of failure whereas concurrency even though is little more expensive in terms of resources but would result in minimal loss in case of failure.

In case messages are to be consumed in a particular order, batching them in that order and then consuming them makes better sense.

if incoming messages are not continuous , it makes more sense to do concurrency as we need not wait for all messages to form a batch and flush. Though time sensitivity can be added but that would add unnecessary complexity.

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 Q9. What Design pattern Wrapper Classes implement ?Design
Anonymous
Ans. Adapter.

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 Q10. What is the difference between these two approaches of creating singleton Class ?

//Double Checked Locking Code
public static Singleton createInstance() {
   if(singleton == null){
      synchronized(Singleton.class) {
         if(singleton == null) {
            singleton = new Singleton();
         }
      }
   }
   return singleton;
}

//Single checked locking code
public static Singleton createInstance() {
   synchronized(Singleton.class) {
      if(singleton == null) {
         singleton = new Singleton();
      }
   }
   return singleton;
}
Design
Admin
info@buggybread.com
Ans. In First Case , Lock for the synchronized block will be received only if singleton == null whereas in second case every thread will acquire the lock before executing the code.
The problem of synchronization with singleton will only happen when the object has not be instantiated. Once instantiated , the check singleton == null will always generate true and the same object will be returned and hence no problem. First condition will make sure that synchronized access ( acquiring locks ) will only take place if the object has not been created so far.

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 Q11. Difference between Factory and Builder Design Pattern ?Design
Anonymous
Ans. Builder pattern is the extension of Factory pattern wherein the Builder class builds a complex object in multiple steps.

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 Q12. Difference between Proxy and Adapter ?Design
Anonymous
Ans. Adapter object has a different input than the real subject whereas Proxy object has the same input as the real subject. Proxy object is such that it should be placed as it is in place of the real subject.

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 Q13. Difference between Adapter and Facade ?Design
Anonymous
Ans. The Difference between these patterns in only the intent. Adapter is used because the objects in current form cannot communicate where as in Facade , though the objects can communicate , A Facade object is placed between the client and subject to simplify the interface.

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 Q14. Difference between Builder and Composite ?
Anonymous
Ans. Builder is a creational Design Pattern whereas Composite is a structural design pattern. Composite creates Parent - Child relations between your objects while Builder is used to create group of objects of predefined types.

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 Q15. Example of Chain of Responsibility Design Pattern ?
Anonymous
Ans. Exception Handling Throw mechanism.

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 Q16. Example of Observer Design Pattern ?
Anonymous
Ans. Listeners.

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 Q17. Difference between Factory and Strategy Design Pattern ?Design
Anonymous
Ans. Factory is a creational design pattern whereas Strategy is behavioral design pattern. Factory revolves around the creation of object at runtime whereas Strategy or Policy revolves around the decision at runtime.

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 Q18. Shall we use abstract classes or Interfaces in Policy / Strategy Design Pattern ?
Anonymous
Ans. Strategy deals only with decision making at runtime so Interfaces should be used.

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 Q19. What is a Listener ?Design
Anonymous
Ans. In GUI programming, an object that can be registered to be notified when events of some given type occur. The object is said to listener? for the events.

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 Q20. What are use cases?Process
Admin
info@buggybread.com
Ans. It is part of the analysis of a program and describes a situation that a program might encounter and what behavior the program should exhibit in that circumstance.

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 Q21. What are different types of dependency injections ?Design 2017-11-07 09:37:47

Ans. Setter injection
Constructor injection
Interface injection
Look-up method/method injection

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Very frequently asked. Usually followed by questions related to private constructor and synchronized access. Frequently asked in JPMorgan and TCS (Based on 2 feedback)
  Q22. Explain Singleton Design Pattern ?Design
Admin
info@buggybread.com
Ans. http://www.buggybread.com/2014/03/java-design-pattern-singleton-interview.html

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 Q23. Shouldn't we make a class with all static members is its just expected to be executed as a standalone program with just one thread. Moreover Lets assume that there is no runtime Polymorphism required and there is no need for serialization ?Design
Admin
info@buggybread.com
Ans. Still No in case we are making use of inheritance. we may have problem wherein we have program flow moving across common inherited method and specific methods of the derived class. call made to another static method in the parent class will only access the static class of the Parent class irrespective of the call from any of the derived class.

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 Q24. Give an Example for Builder Pattern ?Core Java
Admin
info@buggybread.com
Ans. String str = new StringBuilder().append("Buggy").append("Bread").toString();

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 Q25. Which UML diagrams you usually use for design ?Design
Admin
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Ans. Use Case Diagram, Component Diagram for High level Design and Class Diagram , Sequence Diagram for low level design.

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 Q26. What kind of software architecture your organization follow ?Design
Admin
info@buggybread.com
Ans. We have multi tier architecture with multiple layers , We have series of web servers and applications in application tier, infrastructure libraries at middle tier and Database servers at the lower tier. We are using Oracle as Database, ESB ( Enterprise service Bus ) for asynchronous communication and Rest Web Services.

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 Q27. Which of the following is not the difference between Singleton and Static class ( Class with static members only ) ?

a. Only one object can be created for Singleton class whereas No objects are created for static class.
b. Singleton class instance is initiated using new keyword whereas static class instance is created using static method.
c. Singleton class can be serialized whereas Static class cannot be.
d. Singleton Class can participate in runtime Polymorphism whereas Static class cannot.
Anonymous
Ans. Singleton class instance is initiated using new keyword whereas static class instance is created using static method.

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 Q28. What are the fail safe systems ?Operating System2016-06-09 09:29:43

Ans. Fail Safe systems are tolerant systems that continue processing even if they sense any problem. the objective here is to continue with the processing even if there are some problems instead of completely shutting it down. Example could be to catch an exception and still letting it complete with partial results.

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 Q29. Explain TDD or Test Driven Design ?Design

Ans. TDD is a development process that involves short iterations: first an automated test case is written. Then, the code is written to pass that test, and finally one refactors the new code to acceptable standards.

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Frequently asked in face to face interviews.
  Q30. Write a program to print fibonacci series.Core Java

Ans. int count = 15;
int[] fibonacci = new int[count];
fibonacci[0] = 0;
fibonacci[1] = 1;
for(int x=2; x < count; x++){
fibonacci[x] = fibonacci[x-1] + fibonacci[x-2];
}

for(int x=0; x< count; x++){
System.out.print(fibonacci[x] + " ");
}

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 Q31. Write code for singleton classDesign

Ans. http://javasearch.buggybread.com/CodeSnippets/searchCodeSamples.php?keyword=singleton+class&category=code

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 Q32. Write code for the usage of Builder Design Pattern

Ans. http://javasearch.buggybread.com/CodeSnippets/searchCodeSamples.php?&category=code&searchOption&keyword=964

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 Q33. What are the fail fast systems ?2016-06-09 09:31:27

Ans. Fail fast systems are intolerant systems that fails at the first instance of smelling any problem. The objective here is to break the system instead of continuing with the possibly flawed processing. Example could be breaking the processing upon an exception.

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 Q34. If you are given a choice to have a functionality shared either through dependency or through a Web service, which one will you choose ?Solution2016-06-13 10:38:53

Ans. Web Service promotes looser coupling but with comes with coding and performance overheads. Jars provide better performance and may be lesser coding but are problematic with update distribution. If the situation doesn't require frequent dependency updates and if it's only read operation of persistence, Having dependencies should be a better choice , otherwise web service.

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Frequently asked for Lead and Architect positions. Recently asked in many US companies.
  Q35. What are Anti Patterns ?Design2016-07-14 14:21:11

Ans. Anti-pattern is simply the creation of a pattern in your coding that negatively affects your code i.e the Negatives surpasses the positives.

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 Q36. What are design situations to use Singleton and Prototype Design Pattern ?Design2016-07-28 20:28:43

Ans. Both are creational design patterns.

Singleton is used when we would like to reuse an object if object is not supposed to hold request or thread specific information. Inversely Prototype is used in situations where we would like to reuse the object information but the request / thread may require it own data to be persisted.

In short, Singleton is used in situations where we can live with single object being shared across multiple requests or threads whereas Prototype is used when we need duplicate copies of objects.

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 Q37. Does it make sense to clone an object which is supposed to be immutable ?Design2016-07-28 20:54:59

Ans. It make sense only if we intend to modify either of the object and would like to preserve original state in other. Otherwise we can reuse the original object by making it singleton.

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 Q38. Can Enum be a replacement for a constant file in majority of the situation ?Design2016-08-11 16:21:25

Ans. Yes , it can be but it may not be an optimal alternative if we need to change the values frequently. As Enum is compiled like any Java File , any change requires the application to be rebuild , deployed and restart.

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 Q39. Write a class explaining builder pattern ?Design2016-08-17 10:32:03

Ans.
public class BuggyBread { 

private String element1;

private String element2;

private BuggyBread(String element1, String element2){
this.element1 = element1;
this.element2 = element2;
}

public static class Builder {

private String element1;

private String element2;

Builder(BuggyBread buggybread){
element1 = buggybread.element1;
element2 = buggybread.element2;
}

Builder withElement1(String element1){
this.element1 = element1;
return this;
}

Builder withElement2(String element2){
this.element2 = element2;
return this;
}

BuggyBread build(){
BuggyBread buggybread = new BuggyBread(element1,element2);
return buggybread;
}
}
}


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 Q40. What are the advantages and disadvantages of Factory Design Pattern ?Design2016-09-07 09:19:26

Ans. Object Oriented Design Patterns is the science of identifying the pattern to make objects communicate in a way to effectively implement a Solution.

Factory Design Patterns is the pattern that recommends creation of separate Factory Object for creation of other object. So its like saying - If you want to create an object of ClassA, Talk to FactoryObject ( which is an object of FactoryClass ). FactoryObject in itself encapsulates the inputs and logic required to make the decision regarding the creation and construction of object.

Advantage of Factory Pattern - Loose Coupling and Segregation of Responsibilities. Now instead of hard binding the complete logic to decide the nature and shape of the object on the basis of some conditions, you are assigning the responsibility to some other object and hence making the relationship loosely coupled and hence main tenable.

Disadvantages - Before Understanding the Dis-advantages , we should understand that these patterns were chosen after a period of evolution and research and almost best fit for the required solution, otherwise these patterns would have easily been replaced by now.

Though the advantages of these pattern surpass the disadvantages keeping in mind the decreasing cost of resources and increasing scale of applications, but still loose coupling by means of additional objects results in decreased performance.

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