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Q1231. What are some uses of interceptors ?

Ans. Authentication / Authorization
URL forwarding
Auditing / Logging
Localization

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Q1232. Explain Interceptor Design Pattern ?

Ans. It is used for intercepting the request. It's primary use is to implement security policy. All or specific request types can be intercepted and hence forwarded to authentication / authorization module so as to facilitate authorized requests to application.

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Q1233. Can you give an example of "Convention over configuration" Design principle ?

Ans. Hibernate mapping configurations are used for mapping hibernate entities and corresponding DB Tables. Conventionally Entities and Table can share the same name and hence framework can provide implicit mapping instead of explicit mapping through configurations. Though it may result in little loss of flexibility in extreme cases but will work with all applications following the convention.

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Q1234. Are there any disadvantages of "Convention over configuration" Design paradigm ?

Ans. Yes, It may result in some loss of flexibility as the application has to follow all conventions. Moreover it can contradict with other design paradigms or principles used in the application or framework.

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Q1235. What is "convention over configuration" ? Which framework uses this design paradigm ?

Ans. Convention over configuration is a way of software design used by frameworks that attempt to decrease the number of decisions that a developer is required to make without necessarily losing flexibility. The objective is to reduce the unnecessary configurations and follow conventions to accomplish that. For example - DB Entity and DB Table name conventionally should be same and hence shouldn't require configuring mapping between the two.

"Spring Boot" and "Ruby on Rails" have adopted this design principle.

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Q1236. Why is goto not used in Java?

Ans. Goto statement results in unstructured jumps in control from one code location to another and hence makes the code very difficult
to read , maintain and debug. Moreover Goto can always be replaced using other statements like break / continue and hence results in structured movement of programming control.

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Q1237. Are Annotations better than using XML configs ?

Ans. Yes , as both code and its meta information reside in the same file, it promotes better readability and maintenability.

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Q1238. What is the use of Annotations in Java ?

Ans. Annotations are used to specify meta information about the code.

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Q1239. Can we discover end points of Rest API without looking at the code ?

Ans. Generally Rest services don't have any registry like we have WSDL is SOAP and hence don't have a way to know the end points without looking at either the url mapping in controller or client code. Some restful service publish WADL (Web Application Description Language) and hence clients can locate the service end points.

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Q1240. What are protocol buffers ?

Markup Language

Ans. Protocol buffers are language-neutral, platform-neutral, mechanism for serializing structured data. It is developed by google.

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Q1241. Write a Program to convert a binary to number ?

Ans. int convert(int binaryInt) {
int sumValue=0;
int multiple = 1;
while(binaryInt > 0) {
binaryDigit = binaryInt;
binaryInt = binaryInt /10;
sumValue = sumValue (binaryDigit * multiple);
multiple = multiple * 2;
}

return sumValue;
}

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Q1242. Write a multi threaded Program that will simulate transferring of money across accounts ?

^{This question was recently asked at 'Trustwave'.This question is still unanswered. Can you please provide an answer.}

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Q1243. What are your short and long terms goals ?

^{This question was recently asked at 'Horizon Solutions'.This question is still unanswered. Can you please provide an answer.}

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Q1244. Which tools have you used in your previous projects ?

^{This question was recently asked at 'Horizon Solutions'.This question is still unanswered. Can you please provide an answer.}

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Q1245. Which type of projects have you worked on ?

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Q1246. Which component of MVC you like to work on ?

^{This question was recently asked at 'CapTech'.This question is still unanswered. Can you please provide an answer.}

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Q1247. which one do you prefer - JDBC or Hibernate ?

^{This question was recently asked at 'Captech'.This question is still unanswered. Can you please provide an answer.}

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Q1248. Whats is the difference between Spring MVC and Spring Restful webservice ?

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Q1249. Write a class and override the equals and hashcode method ?

Ans. class Student
{
///
///
///
private int id;
private String name;

///
///
///
public Student(int id, String name)
{
this.name = name;
this.id = id;

}// Student

///
///
///
public int getId()
{
return id;

}// getId

///
///
///
public void setId(int id)
{
this.id = id;

}// setId

///
///
///
public String getName()
{
return name;

}// getName

///
///
///
public void setName(String name)
{
this.name = name;

}// setName

@Override
public boolean equals(Object obj)
{
if (obj == null) return false;
if (!(obj instanceof Student))
return false;
if (obj == this)
return true;

return this.getId() == ((Student) obj).getId();

}// equals

///
///
///
@Override
public int hashCode()
{
return this.getId();

}// hashCode

}// Student

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Q1250. How does java identifies which method to be called in method overriding or runtime polymorphism, when both methods share the same name and signature ?

Ans. Java identifies the method to be called at runtime by the object that is being referenced.

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Q1251. Which of the two - compile time and run time polymorphism - requires signature of the method to be different ?

Ans. runtime polymorphism or method overriding doesn't require method name and signature to be different whereas compile time polymorphism or method overloading requires method name to be same but the signature to be different.

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Q1252. How can you extract integers from string values and add (sum it up) all the extracted integers? e.g "James34long4island322in3rdAvenue" ---> 34 4 322 3 = 363

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Q1253. How is garbage collection in Java 8 different from Java 7 ?

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Q1254. What is the use of java.util.concurrent package in Java ?

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Q1255. What is the meaning of "stickfp" in Java ?

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Q1256. What is Executor Framework in Java?

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Q1257. What is the difference between keywords, identifiers and literals in java ?

Ans. Keywords are the reserved words that have a pre defined meaning for the compiler and hence are restricted to be used as identifiers.

Identifiers are the name assigned to different programming constructs like classes, interfaces, methods , variables etc.

Literals are the values that are assigned to Identifiers.

For example

int count = 0;

in the above statement "int" is a keyword, "count" is an identifier and "0" is a literal

Sample Code for keywords

Sample Code for identifiers

Sample Code for literals

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Q1258. What are the some literals in java that are reserved and hence cannot be used as identifiers ?

Ans. true , false and null

Sample Code for literals

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Q1259. Can we use true and false as identifiers in java ? Are they keywords in Java ?

Ans. true and false are literals in java. No we cannot use them as identifiers.

Sample Code for literal

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Q1260. What is the importance of Abstract Class ?

Ans. Abstract classes provide a mechanism of interfacing ( using abstract method ) as well as code reuse through inheritance ( extending abstract class )

Comparing to concrete class they have an advantage of providing interface which a concrete class doesn't provide.

Comparing to interfaces they have an advantage of providing code reuse through inheritance which interfaces dont provide.

Sample Code for abstract class

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