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Interview Questions and Answers - Order By Rating

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 Q931. How do you check logs for your application in AWS ?Amazon Web Services (AWS)
Ans. We can do it by either going to Elastic Beanstalk -> Respective instance -> Logs

or using CloudWatch -> Logs -> Respective Log Group

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   Like         Discuss         Correct / Improve     aws logs  cloudwatch logs  elastic beanstalk

 Q932. What is the difference between Elastic Compute Cloud and Elastic Beanstalk ?Amazon Web Services (AWS)
Ans. EC2 is Amazon computing service whereas Elastic Beanstalk is the AWS service for deploying and managing web applications.

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   Like         Discuss         Correct / Improve     Elastic Compute Cloud   EC2   Elastic Beanstalk

 Q933. What is the difference between latency, response time and processing time ?Web Service
Ans. Latency is the delay incurred while communicating a message i.e the time took the message in transit over network.

processing time is the delay it took for the server to process the request.

Response time is the sum total of latency and processing time.

For example -

Let's say it takes 1 ms for the request to reach from client to server and similar 1 ms for the response to come back to client. Moreover it takes approx 10 ms for the application to process the request. So The response time would be outward latency + processing time + inward latency = 12 ms

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   Like         Discuss         Correct / Improve     latency   response time    processing time

 Q934. What is Amazon EC2 ?Amazon Web Services (AWS)
Ans. Amazon Elastic Compute Cloud or EC2 provides scalable computing capacity in the AWS cloud. It can be used to create Virtual Environments , storage and configure. EC2 enables to upgrade or downgrade infrastructure according to the rules defined ( with fluctuation in latency, traffic etc )

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   Like         Discuss         Correct / Improve     aws  aws ec2  aws computing  amazon cloud computing  amazon ec2  Elastic Compute Cloud  Amazon Elastic Compute Cloud     Asked in 2 Companies

 Q935. How many Windows are there in Manhattan ?General
Ans. Population of Manhattan is roughly 2 millions. Nearly same number of people come to Manhattan daily for work. So if whole of Manhattan comprise of only residential and commercial buildings, that makes up 1/3rd residential and 2/3rd commercial. I have lived in a house in a high rise building in downtown and the average size of the house is 1 bedroom with 2 windows and on average 2 people live in a house. So that makes up roughly 1.33 million windows in Residential buildings. At commercial buildings, windows per capita is much lower as more people share the space and roughly it comes down to 1 window for 10 people. So that makes up .266 millions windows in commercial establishments.

So in total there are roughly 1.6 million windows in Manhattan.

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   Like         Discuss         Correct / Improve     how many

 Q936. why aren't arrays better than array list ?Core Java
Ans. 1. Arrays don't provide any built in support for sorting searching like operation and we need to do it explicitly.

2. It can hold only homogeneous objects,

3. We have to reserve memory as no dynamic expansion allowed.

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   Like         Discuss         Correct / Improve     arrays  arraylist  arrays vs arraylist     Asked in 3 Companies

 Q937. What is dynamic dispatch in Java ?Core Java
Ans. Dynamic dispatch in java is also known as runtime polymorphism.It is a process in which a call to an overriden method is resolved at runtime.

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   Like         Discuss         Correct / Improve     dynamic dispatch  runtime polymorphism  object oriented programming (oops)  oops concepts

 Q938. What is meant by "Locality of Reference" or "Cache Locality" ?Core Java
 This question is still unanswered. Can you please provide an answer.


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   Like         Discuss         Correct / Improve     Cache Locality  Locality of Reference

 Q939. What is Lambda Calculus ?Core Java
 This question is still unanswered. Can you please provide an answer.


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   Like         Discuss         Correct / Improve     lambda calculus

 Q940. What is meant by the statement "Java is turing complete" ?Core Java
 This question is still unanswered. Can you please provide an answer.


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   Like         Discuss         Correct / Improve     turing complete

 Q941. Can you give real time examples of thread or where thread are actually used ?Core Java
Ans. Games are very good examples of threading.You can use multiple objects in games like cars, motor bikes, animals, people etc. All these objects are nothing but just threads that run your game application.

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   Like         Discuss         Correct / Improve     threads  multithreading     Asked in 1 Companies

 Q942. What are the examples of immutable objects in Java ?Core Java
Ans. Following Classes in Java SE creates immutable objects

String class
Wrapper Classes like Integer, Float etc.
StackTraceElement
Most Enum classes
File Class
Locale Class

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   Like         Discuss         Correct / Improve     immutable  immutability objects  immutable  immutability     Asked in 1 Companies      Basic        frequent

 Q943. Write a Program to delete a node from Linked List ?Data Structure
 This question was recently asked at 'Caprus IT'.This question is still unanswered. Can you please provide an answer.


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   Like         Discuss         Correct / Improve     linkedlist  delete a node from linked list     Asked in 1 Companies

 Q944. How do you take screenshot in selenium?Selenium
Ans. TakeScreenshot th = TakeScreenshot(driver); //Enable the driver object to take screenshot

File src = th.getScreenShotAs(OutputType.FILE);

FileUtils.copyFilesrc("locationWhereUWantToPlaceTheScreenshot.jpg");

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   Like         Discuss         Correct / Improve     webdriver  selenium     Asked in 1 Companies

 Q945. What is the order in which triggers gets fired ?Database
Ans. There is no specific order in which database fires the triggers if they are for the same operation. If we need to have a specific order for their execution, we should have them all in a stored procedure and the procedure should get executed upon the event.

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   Like         Discuss         Correct / Improve     oracle  database  triggers  sequence of trigger execution  sequence in which triggers gets fired     Asked in 1 Companies

 Q946. What is a host file ?Operating System
Ans. It's an operating system file that maps IP address to host names. The hosts file assists the OS in addressing networked components and serves the function of translating human friendly hostnames into numeric protocol addresses, called IP addresses, that identify and locate a host in an IP network.

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   Like         Discuss         Correct / Improve     host file  operating system     Asked in 1 Companies

 Q947. Do you prefer using var args ?Core Java
Ans. Though var args are used rarely but they are pretty useful if a method is expected to receive variable number of arguments. For example - it's pretty useful for the main method as the caller has the flexibility to provide arguments in infinite ways.It provides a convenience and flexibility to the caller.

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   Like         Discuss         Correct / Improve     var args  methods  method declarations  functions

 Q948. What is the difference between these two method declarations ?

private static void method(String[] arg)

and

private static void method(String... arg)		Core Java
Ans. First expects the argument as a string array whereas second expects variable number of string arguments or a string array.

So we can call both by providing string array as an argument but second can be called with 0 to n string arguments which cannot be done for first.

for example - We can call second method with any of following

method();
method("Hello");
method("Hello","World");
method(new String[4]);


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   Like         Discuss         Correct / Improve     var args  methods  method declarations  functions

 Q949. Will this code work

public class BuggyBread {

   public static void main(String[] args) {
      method("Hello","World");
   }

   private static void method(String[] arg){
      System.out.println(arg);
   }
}

What all possible changes we can make to method signature to make it work ?		Core Java
Ans. It won't work as java won't find the method definition for method with 2 arguments.

We can either declare the method as

private static void method(String arg,String arg2)

or

private static void method(String... arg)

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   Like         Discuss         Correct / Improve     var args  methods  method declarations  functions

 Q950. Do you see any problem with this code

public class BuggyBread {

   public static void main(String[] args) {
      method("Hello");
   }

   private static void method(String... args){
      for(String arg:args){
         System.out.println(arg);
      }
   }

   private static void method(String[] arg){
      System.out.println(arg);
   }
}		Core Java
Ans. Yes, it will give compilation error and java will complain about duplicate method. Java treat var args internally as arrays and hence would result in same byte code for both method's syntax.

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   Like         Discuss         Correct / Improve     var args  methods  method declarations  functions

 Q951. Do you see any problem with this code

public class BuggyBread {

   public static void main(String[] args) {
      method("Hello");
   }

   private static void method(String... args){
      for(String arg:args){
         System.out.println(arg);
      }
   }

   private static void method(String arg){
      System.out.println(arg);
   }
}		Core Java
Ans. It will compile fine and the method call will bind to method with specific argument and not with var arg

i.e private static void method(String arg)

It will print "Hello" upon execution

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   Like         Discuss         Correct / Improve     var args  methods  method declarations  functions

 Q952. Do you see any problem with this code

public class BuggyBread {

   public static void main(String[] args) {
      method();
   }

   private static void method(String... args){
      for(String arg:args){
         System.out.println(arg);
      }
   }
}		Core Java
Ans. This will compile fine as we can provide 0 arguments for a var arg but will print nothing upon execution.

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   Like         Discuss         Correct / Improve     var args  methods  method declarations  functions

 Q953. Do you see any problem with this code

public class BuggyBread {

   public static void main(String[] args) {
      method("Hello","World");
   }

   private static void method(String... args){
      for(String arg:args){
         System.out.println(arg);
      }
   }
}		Core Java
Ans. No, It will compile and execute perfectly fine. As we are using method with var args , we can call it with 0 to n arguments.

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   Like         Discuss         Correct / Improve     var args  methods  method declarations  functions

 Q954. Can we catch errors in Java ? Core Java
Ans. Yes we can

try {
// code
} catch (Error ex) {
// handling code
}

but we shouldn't ideally do that as errors are mostly JVM based and not application based and there is rarely we can do something about it. Very likely catching and not re throwing would lead to muting their response or trace.

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   Like         Discuss         Correct / Improve     exception handling  error handling  errors     Asked in 1 Companies      intermediate

 Q955. Is it ok to use optional everywhere just to get over nullpointerexception ?Core Java
Ans. Optional is to be used for arguments / atrributes which are indeed optional i.e the request should continue even if they aren't provided. It should not be used for mandatory attributes or arguments as we would like application to shout out ( with error message / exception trace ) to signify a problem.

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   Like         Discuss         Correct / Improve     optional  nullpointerexception  java8  java 8     Asked in 1 Companies

 Q956. Which method will get called if we call it as method(1)

void method(int x ){};
void method(int... x){};		Core Java
Ans. Though the call an be bind to either of these but in this case, 1st method will get priority and hence will be called.

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   Like         Discuss         Correct / Improve     var args  method  function  overloading  scjp  ocjp

 Q957. Can we overload method as following ?

void method(int... x){};
void method(int[] x){}; 		Core Java
Ans. No. Because java internally treats var args as arrays and hence both method declarations will generate the same byte code and hence would result in ambiguity while determining call binding.

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   Like         Discuss         Correct / Improve     var args  methods  functions   method declaration  scjp  ocjp

 Q958. Why following method declarations are not valid ?

void method(int... x, int y){};
void method(int... x,int... y){};		Core Java
Ans. Because var args are not only allowed with the last argument in the method declaration.

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 Q959. Which of the following are valid declarations

1. void method(int... x){};
2. void method(int.. x){};
3. void method(int.. .x){};
4. void method(int ...x){};
5. void method(int... x){};
6. void method(int ... x){};
7. void method(int x, int... y){};
8. void method(int... x, int y){};
9. void method(int... x,int... y){};
Core Java
Ans. 1st is a valid and standard declaration.

2nd results in compilation error as only 2 dots are there.

3rd results in compilation error as three dots are not consecutive and broken.

4 through 6 may not be standard and ideal way of declarations but they are valid and will compile and work fine.

7 is valid declaration.

8 and 9 will result in compilation error as var args can only be provided to last argument.

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 Q960. What are var args ?

or

What is the use of var args ?		Core Java
Ans. Var args is the feature of Java that allows a method to have variable number of arguments. Var args are used when we are not sure about the number of arguments a method may need. Internally java treats them as array.

Declarations of methods with var args

void method(int... x){};
void method(int x, int... y){};

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   Like         Discuss         Correct / Improve     var args  methods  functions   method declaration     Asked in 2 Companies

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