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 Q211. Overridden methods must have the same ...

a. name
b. name and argument list
c. name, argument list, and return type
d. name, argument list, return type and belong to the same class
Ans. name and argument list

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   Like         Discuss         Correct / Improve     java   overriding
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 Q212. Which of the following is not the advantage of Mocking frameworks ?

a. It helps testing the module independently
b. It helps in faster unit testing
c. It helps in testing code even when external dependencies like service calls are not working
d. It helps in doing end to end Integration Testing
Ans. It helps in doing end to end Integration Testing

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   Like         Discuss         Correct / Improve     mocking frameworks   mockito   unit testing   junits

 Q213. Which of the following file is called deployment descriptor ?

a. application.xml
b. project.xml
c. web.xml
d. build.xml		Java EE
Ans. web.xml

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   Like         Discuss         Correct / Improve     configuration files   deployment   server   java

 Q214. Which of the following is dependency exclusion ?

a. A doesn't depend on C and then A marks C as excluded.
b. A Depends on B and B depends on C and then A can mark B as excluded.
c. A and B depends on C and then they can mark C as excluded.
d. A depends upon B and B depends upon C then A marks C as excluded.
Maven
Ans. A depends upon B and B depends upon C then A marks C as excluded.

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   Like         Discuss         Correct / Improve     maven   dependency exclusion

 Q215. Which of the following is false about Constructors ?

a. Constructor can be overloaded
b. A no argument constructor is provided by the compiler if we declare only constructors with arguments.
c. Constructors shouldn't have any return types , not even void.
d. If super is not explicitly called, still super() is intrinsically added by the compiler.
Core Java
Ans. A no argument constructor is provided by the compiler if we declare only constructors with arguments.

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   Like         Discuss         Correct / Improve     java   oops   constructor
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 Q216. Which of the following doesn't extend Collection interface ?

a. Set
b. List
c. Map
d. Queue
Core Java
Ans. Map

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   Like         Discuss         Correct / Improve     java   collections   collection interface

 Q217. Which of the following Java feature promotes Code Re usability ?

a. Abstraction
b. Encapsulation
c. Inheritance
d. Polymorphism
Core Java
Ans. Inheritance

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   Like         Discuss         Correct / Improve     java   java concepts   java features   code reusability

 Q218. Which of the following is not a build tool or plugin ?

a. Maven
b. Ant
c. Gradle
d. svn		Tool
Ans. svn

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 Q219. enums are intrinsically ..

a. private
b. public
c. static
d. final
Core Java
Ans. static

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   Like         Discuss         Correct / Improve     java   enum

 Q220. What will happen if we don't have termination statement in recursion ?
Ans. Function call allocates a stackframe in stack. Every stackframe will use some memory to store local variables, parameters and to remember return address. Without terminating condition stackframes will keep consuming memory from stack and eventually program will result in stackoverflow error.

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   Like         Discuss         Correct / Improve     recursion   break statement  break  stackoverflow exception  stackoverflow  memory management  memory  exceptions

 Q221. 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

This question can be asked in different variants like performace improvement of an application, improving performance for DB communication etc.
 Q222. What are the ways in which execution time of the code can be improved ?Solution
Ans. This depends on entirely upon the code type. For example

1.If its just logic, we can try it to short circuit or put the if / switch case with maximum probability in the beginning.

2. Can use faster data structures, for eg - random retrieval instead of sequence / iterator

3. Working with primitive types or even bytes instead of Objects, even though it may result in marginal improvement.

4. If its service call, then service call with bulk load can help

5. If DB Operation, then with use of Indices , Views or using ORM , cache etc.


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   Like         Discuss         Correct / Improve     performance improvement  code optimization     Asked in 1 Companies

  Q223. Difference between GET and POST Requests ?Web Service
Ans. GET is supposed to get information from the server. Client sends the minimal information so that Server can respond with the response body on basis of request. For example - You want to get complete employment record for employee id 123

POST is supposed to send the information for submission. Payload or a Body is usually sent so that it can be persisted on the server. For example - Sending the complete information of an employee ( id, name , dept etc ) to the server for persisting it.

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   Like         Discuss         Correct / Improve     get vs post   web service   rest     Asked in 11 Companies      basic        frequent

 Q224. How do you resolve Maven Dependencies issue while upgrading dependencies versions ?Maven
Ans. Step 1 - Upgrade the required dependency , perform build and check build errors

Step 2.1 - If the error is of missing transitive dependency ( which is rare and means that the previous version has a dependency which is missing in the later version ), I would look for the dependency in google and hence will include it as direct dependency in Pom file.

Step 2.2. If the error is for Duplicate dependencies , and the choice is between transitive and direct dependency, I usually remove the direct dependency.

Step 2.3 - If the error is for Duplicate dependencies , and both are transitive dependencies. I first make a choice ( usually later version ) and then ignore the previous version dependency.

Step 2.4 - If the error is for Duplicate dependencies , and there are more than 2 duplicates, I usually ignore it by specifying within maven-enforcer-plugin config.

Step 3 - Perform a Clean Build.

Step 4 - Check Maven Dependency Tree to make sure that Duplicates have been removed or dependency is there in case of missing dependency.

Step 5 - Perform tests and make sure that there are no runtime problems.

Step 6 - If there are runtime problems ( which very likely occurs if you have different version dependencies , very likely by doing 2.4 , you will have to remove step 2.4 and alternately perform 2.2 or 2.3 )

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   Like         Discuss         Correct / Improve     maven  maven dependency  transitive dependency

  Q225. What is coupling and Cohesion ?Design
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.

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   Like         Discuss         Correct / Improve     coupling  cohesion     Asked in 10 Companies        frequent

 Q226. Design a Data Structure for a full text Search ?Design
 This question was recently asked at 'Myntra'.This question is still unanswered. Can you please provide an answer.


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   Like         Discuss         Correct / Improve     Full Text Search  Data Structure     Asked in 1 Companies      expert

 Q227. Write a Program to reverse a Linked List ?Data Structure
 This question was recently asked at 'Myntra,Compro Technologies'.This question is still unanswered. Can you please provide an answer.


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   Like         Discuss         Correct / Improve          Asked in 2 Companies

 Q228. What are different types of variables a class can have ?Core Java
Ans. 1. Method local variables - These are declared and defined within a method ( instance or static methods ) and their scope is limited to the method itself. They are destructed once the execution of method completes. They are stored in stack memory.

2. Instance variables - These are declared as non static variables as part of the class.They are initialized as part of object creation ( constructor ) and are destructed by java's garbage collection mechanism and hence stored in heap.

3. Static variables - These are declared with the static keyword and are part of the class. They are initialized at the time of class loading and are destructed by java's garbage collection mechanism and hence stored in heap.

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   Like         Discuss         Correct / Improve     java variables

  Q229. Why java doesn't support multiple Inheritance ?

or

Explain Java Diamond Problem.		Core Java
Ans. class A {
void test() {
System.out.println("test() method");
}
}

class B {
void test() {
System.out.println("test() method");
}
}

Suppose if Java allows multiple inheritance like this,

class C extends A, B {
}

A and B test() methods are inheriting to C class.

So which test() method C class will take? As A & B class test() methods are different , So here we would Facing Ambiguity.

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   Like         Discuss         Correct / Improve     multiple inheritance  object oriented programming (oops)  oops concepts  diamond problem     Asked in 20 Companies      basic        frequent

 Q230. Design an app to find 10 most visited urlsCore Java
 This question was recently asked at 'Wayfair'.This question is still unanswered. Can you please provide an answer.


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   Like         Discuss         Correct / Improve          Asked in 1 Companies

 Q231. Trim a string without using String library methodCore Java
 This question was recently asked at 'Ariba'.This question is still unanswered. Can you please provide an answer.


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   Like         Discuss         Correct / Improve     code  coding.string  trim a string     Asked in 1 Companies

Usually asked to entry level software developers.
  Q232. Write a program to swap two variables without using thirdCore Java
Ans. public static void main(String[] args) {
   int num1 = 1;   
   int num2 = 2;
   num1 = num1^num2;
   num2 = num1^num2;
   num1 = num1^num2;
   System.out.print("num1 = " + num1 +", num2 = "+num2);
}

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   Like         Discuss         Correct / Improve     code  coding     Asked in 37 Companies      basic        frequent

 Q233. Write a Program to print pattern like following

*
**
***
****
*****
*****
****
***
**
*		Core Java
Ans. public class BuggyBread {
   public static void main(String args[]) {
      for(int x=1;x<=5;x++){
         for(int y=1;y<=x;y++){
            System.out.print("*");
         }
         
         System.out.println("");
      }
      
      for(int x=5;x>=1;x--){
         for(int y=1;y<=x;y++){
            System.out.print("*");
         }
         
         System.out.println("");
      }   
   }
}

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 Q234. What are the disadvantages of Hibernate over native APIs ?Hibernate
 This question is still unanswered. Can you please provide an answer.


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 Q235. If an Abstract class has only abstract methods, What's the difference between such a class and an interface ?Core Java
Ans. Such a class still can have member elements which can be inherited and hence facilitate code reuse. Moreover Abstract class can have non final static elements whereas interfaces are only allowed to have static final elements.

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   Like         Discuss         Correct / Improve     abstract class   interfaces     Asked in 2 Companies      Basic

 Q236. 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

 Q237. What is the difference between single instance Web environment and Load Balanced Auto Scaling ? Amazon Web Services (AWS)
Ans. Single instance means there is only 1 instance that will bear all the traffic load whereas Load balanced server means that there will be a cluster of servers that will host the application and load will be balanced distributed among them. Auto Scaling means that the number of instances will be expanded / shrunken based on the rule. Rule could be the traffic count , response time etc.

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   Like         Discuss         Correct / Improve     load balancing  auto scaling  aws  elastic beanstalk

 Q238. What does import java.util.* means in java ? Core Java
Ans. It means import all the classes and interfaces within java.util package and make them available to use within the current class or interface. This is shorthand wild card annotation for importing all classes within a particular package. This won't import the classes within the sub packages of java.util.

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   Like         Discuss         Correct / Improve     java import   import statement

 Q239. If you need to consume messages from the queue faster, which approach will you recommend - batching or concurrency ?Design
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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   Like         Discuss         Correct / Improve     concurrency vs batching   concurrency  multithreading  batch

 Q240. When we say final x = 10, is the reference final or the value ?Core Java
Ans. final keyword have meaning only to referenced and not the value. It means that the specified reference cannot be dereferenced. It doesn't control the value assigned to the memory that's being referenced. This is the reason that final object references doesn't mean that the object is immutable but means that the reference cannot be changed to point to new object.

In case of primitive types too, when we assign a reference to another, values are passed and not the object reference, and hence a new placeholder is created in memory with the same value. That is why final to that context means that you cannot change the assigned memory and there is no way we can have that memory place have another value.

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   Like         Discuss         Correct / Improve     final keyword  final variables  references

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