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Interview Questions and Answers - Order By Newest

Q1751. Is synchronized a keyword , modifier, identifier? what is it ?

Ans. synchronized is a keyword and a modifier. The synchronized keyword is used to indicate that a method can be accessed exclusively by one thread at a time.

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Q1752. What are access and non access modifiers ?

Core Java

Ans. Access modifiers are the java reserved keywords that changes the access privileges on a class , method , element etc. For example - public , private and protected.

Non Access modifiers are the java modifiers other than access modifiers. For example - static , final, abstract, synchronized, transient, volatile etc.

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Q1753. Which of the following applies to Final ?

It is a keyword
It is a modifier
It is an access modifier

Core Java

Ans. It is a keyword and a modifier but not an access modifier.

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Q1754. Which of the following applies to "private"?

It is a keyword
It is a modifier
It is an access modifier

Core Java

Ans. Yes, all of them applies to private keyword. It is an access modifier.

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Q1755. What is a difference between Identifier and keyword ?

Core Java

Ans. Keyword is a reserved word that has a pre defined meaning for the compiler and hence cannot be used as an identifier, for example - final, private , for etc.

Identifier is the name given by the programmer to a programming construct, for example - class and method names etc.

java Keywords cannot be used as an identifier in java.

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Q1756. Can we use java keywords as identifiers ?

Core Java

Ans. No, keyword has pre defined meaning for compiler and hence cannot be used as identifiers.

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Q1757. What are the benefits of Rest services over using SOAP ?

Web Service

Ans. Rest services are light weight and hence facilitate faster development and involve less overheads compared to SOAP.

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Q1758. How would you go about creating a get rest service if it requires multitude of params or inputs ?

Rest

Ans. If the number of input values is large, we can go about passing them as query params instead of path params. If the number is even larger and complex , its better to create a post service that behaves like a get service. Though this practice is not recommended but technically it can be accomplished.I dont mind doing it if the exceptionally large number of input would make it much more confusing.

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Q1759. What is the importance of Abstract Class ?

Core Java

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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Q1760. Can we use true and false as identifiers in java ? Are they keywords in Java ?

Core Java

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

Sample Code for literal

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Q1761. What are the some literals in java that are reserved and hence cannot be used as identifiers ?

Core Java

Ans. true , false and null

Sample Code for literals

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Q1762. What is Executor Framework in Java?

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Q1763. What is the meaning of "stickfp" in Java ?

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Q1764. What is the use of java.util.concurrent package in Java ?

Core Java

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Q1765. How is garbage collection in Java 8 different from Java 7 ?

Core Java

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Q1766. 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

Core Java

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Q1767. Which of the two - compile time and run time polymorphism - requires signature of the method to be different ?

Core Java

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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Q1768. Write a class and override the equals and hashcode method ?

Core Java

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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Q1769. Whats is the difference between Spring MVC and Spring Restful webservice ?

Spring

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Q1770. which one do you prefer - JDBC or Hibernate ?

Database

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Q1771. Which component of MVC you like to work on ?

Java EE

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Q1772. Which type of projects have you worked on ?

General

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Q1773. Which tools have you used in your previous projects ?

General

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Q1774. What are your short and long terms goals ?

General

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Q1775. Write a Program to convert a binary to number ?

Core Java

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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Q1776. 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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Q1777. Can we discover end points of Rest API without looking at the code ?

Rest

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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Q1778. Can we deploy an application to server using a jar file ?

Java EE

Ans. Conventionally we need a WAR file to be deployed to server. Though with Spring Boot we can even deploy using jar.

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Q1779. What is the use of Annotations in Java ?

Core Java

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

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Q1780. Are Annotations better than using XML configs ?

Core Java

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

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