Search Interview Questions |  More than 3000 questions in repository. There are more than 900 unanswered questions. Click here and help us by providing the answer. Have a video suggestion. Click Correct / Improve and please let us know. |
|
|||
|
| ||||
| Design - Interview Questions and Answers for 'Epam' - 8 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 | ||||
| ||||
| 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 | ||||
| Help us improve. Please let us know the company, where you were asked this question : | ||||
 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 | ||||
| ||||
| Ans. Builder pattern is the extension of Factory pattern wherein the Builder class builds a complex object in multiple steps. | ||||
| Help us improve. Please let us know the company, where you were asked this question : | ||||
| Discuss Correct / Improve java design pattern factory design pattern builder design pattern Asked in 1 Companies expert | ||||
| ||||
| Ans. Coupling is the degree of interdependence between software modules, a measure of how closely connected two modules are or the strength of the relationships between modules. Cohesion refers to the degree to which the elements of a module belong together. Cohesion measures the strength of relationship between pieces of functionality within a given module. | ||||
| Help us improve. Please let us know the company, where you were asked this question : | ||||
| Discuss Correct / Improve coupling cohesion Asked in 10 Companies frequent | ||||
| ||||
| 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. | ||||
| Help us improve. Please let us know the company, where you were asked this question : | ||||
| Discuss Correct / Improve design pattern singleton prototype creational design pattrn Asked in 7 Companies expert | ||||
| Try 1 Question(s) Test | ||||
| Very frequently asked. Usually followed by questions related to private constructor and synchronized access. Frequently asked in JPMorgan and TCS (Based on 2 feedback) | ||||
| ||||
| Ans. http://www.buggybread.com/2014/03/java-design-pattern-singleton-interview.html | ||||
| Help us improve. Please let us know the company, where you were asked this question : | ||||
| Discuss Correct / Improve java design pattern singleton at&t ebay fidelity india united healthcare india Asked in 46 Companies intermediate frequent | ||||
| ||||
| Ans. public class SingleTon { private SingleTon() { if (singleTon != null) { throw new RuntimeException("cant not create the object"); } } public Object clone() throws CloneNotSupportedException { throw new CloneNotSupportedException("can not be create"); } static private volatile SingleTon singleTon; public static SingleTon getInstance() { SingleTon singleTon = this.sample; if (singleTon == null) { synchronized (this) { singleTon = this.singleTon; if (singleTon == null) { singleTon = this.singleton = new SingleTon(); } } } return singleTon; } } | ||||
| Help us improve. Please let us know the company, where you were asked this question : | ||||
| Discuss Correct / Improve singleton design pattern Asked in 2 Companies | ||||
| ||||
| Ans. 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. | ||||
| Help us improve. Please let us know the company, where you were asked this question : | ||||
| Discuss Correct / Improve design pattern factory design pattern Asked in 9 Companies | ||||
| ||||
| Ans. If we don't have double checked locking, it can be broken easily through multi threaded access. Through Reflection. If multiple class loaders are loading the class. If the class is serializable or cloneable. | ||||
| Help us improve. Please let us know the company, where you were asked this question : | ||||
| Discuss Correct / Improve singleton Asked in 2 Companies expert | ||||
Which of the following statement is not true ?
