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 Q331. Which of the following cannot be marked static ?

a. Constructors , Classes ( Outer ) , Classes ( nested ), Interfaces , Local variables , Inner Class methods and instance variables.
b. Constructors , Classes ( Outer ) , Interfaces , Local variables , Class variables , Class Methods , Inner Class methods and instance variables.
c. Constructors , Classes ( Outer ) , Interfaces , Local variables , Inner Class methods and instance variables.
d. Constructors , Classes ( Outer ) , Classes (Nested), Interfaces , Local variables , Inner Class methods and instance variables
Ans. Constructors , Classes ( Outer ) , Interfaces , Local variables , Inner Class methods and instance variables.

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   Like         Discuss         Correct / Improve     oops   java   static   nested classes   static nested classes
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 Q332. Which of the following collection maintain its elements in Natural Sorted order ?

a. HashMap
b. TreeMap
c. LinkedHashMap
d. LinkedMap
Ans. TreeMap

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   Like         Discuss         Correct / Improve     treemap   collections   java   sorted collections   map

 Q333. If we try to add duplicate key to the HashMap, What will happen ?

a. It will throw an exception.
b. It won't add the new Element without any exception.
c. The new element will replace the existing element.
d. Compiler will identify the problem and will throw an error.
Ans. The new element will replace the existing element.

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   Like         Discuss         Correct / Improve     hashmap   map   collections   java

 Q334. Which of the following exception is thrown when we try to access element which is beyond the size ?

a. NullPointerException
b. ArrayIndexOutOfBoundException
c. ArithmeticException
d. ParseException
Ans. ArrayIndexOutOfBoundException

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 Q335. Which java frameworks have you used ?General
Ans. I have primarily worked on Web applications and hence worked on Struts , Spring , Hibernate, JSF ( Java Server Faces ) , Velocity etc.

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  Q336. How are values passed in Java ? By value or reference ?Core Java
Ans. Java only provides pass by value.

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Recently asked in Capital One.
 Q337. What will happen if we call perform(null) ?

public void perform(Object obj) {
System.out.println("Object");
}

public void perform(Integer int) {
System.out.println("Integer");
}		Core Java
Ans. compiler will throws error as ambiguous methods

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  Q338. What is a Database Trigger ?Database
Ans. A trigger is a special kind of stored procedure that automatically gets executed upon an event in the database server.

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 Q339. Have you heard about the external table feature of Oracle ?Database
Ans. The external tables feature is a complement to existing SQL Loader functionality. It enables to access data in external sources as if it were in a table in the database. We have used it few times for replicating tables across different database systems.

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   Like         Discuss         Correct / Improve     external table oracle     Asked in 1 Companies        rare

  Q340. What is a self Join and give an example of a self Join ?

or

What is self Join and What is it's purpose ?		Database
Ans. When a Table Join itself , it's a Self Join. For example - we like to know the pair of department names where first dept has lesser employees than the later.

Select D1.name , D2.name from Dept D1, Dept D2 where D1.employee_count < D2.employee_count

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 Q341. What was the driving force to introduce default methods in Interfaces wef from Java 8 ?Core Java
Ans. Earlier any class implementing an interface was supposed to implement all methods declared in an interface. There was no place for optionally implementing all or subset of methods.Though we have abstract classes wherein we could have provided such a mechanism by declaring some methods as abstract while providing definition for some. But as Abstract classes have a body and are comparatively heavier than interfaces and interfaces associate closely to the concept of providing interfacing than abstract classes, Java might have though of providing optional implementation for default methods. This way same interface can be reused in variety of ways rather than making copies of an interface to suit different needs.

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 Q342. What is a stable build ?Jenkins
Ans. A build is considered stable if it was built successfully and no publisher reports it as unstable.

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 Q343. What are design situations to use Singleton and Prototype Design Pattern ?Design
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.

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   Like         Discuss         Correct / Improve     design pattern  singleton  prototype  creational design pattrn     Asked in 7 Companies      expert
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Frequently asked.
 Q344. When does the finally block gets executed ?Core Java
Ans. A finally block of code always executes, whether or not an exception has occurred.The only time finally won't be called is if you call System.exit() or if the JVM crashes first.

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 Q345. Explain System.out.println ?Core Java
Ans. System is a class within java.lang package that contains several useful class fields and methods. It cannot be instantiated and hence can use only statically.even in this case this has been used statically i.e with class name itself and without creating an instance.

out is the static reference of Printstream declared as following in the System Class -

public final static PrintStream out = null;

println is the method of PrintStream class.

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 Q346. Implement the following method ?

int findMax(int[] items)
Core Java
Ans. int findMax(int[] items){
   int maxNumber = 0;
   for(int x:items){
      if(x > maxNumber){
         maxNumber = x;
      }
   }
      
   return maxNumber;
}

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Very Frequently asked to Senior Software Engineers or Developers.
  Q347. Describe some of the Design Patterns you have used ?Design
Ans. [Open Ended Answer]

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   Like         Discuss         Correct / Improve     design patterns     Asked in 17 Companies      intermediate        frequent

 Q348. If everything is an object , Cant we declare every object as

Object obj = new String();		Core Java
Ans. Yes, we can do that. Compiler wont complain. But using object reference we can only access methods which have been defined for object class i.e clone(), equals(), hashCode(), toString() etc.

We cannot access methods defined in String class or in any class in hierarchy between String and Object.

For example - we cannot do obj.append("abc") as it will now give compile time error.

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 Q349. Which type of memory is cleaned / recovered by garbage collection - stack or heap ?Core Java
Ans. Heap memory.

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 Q350. Write a program to print all even numbers first and then all odd numbers till 100. For example the output should be
2
4
6
8
...... 100
and then
1
3
5
7
...... 99

using only 1 for loop ? Is it possible with just one loop ?		Core Java
Ans. Yes , It can be done using single for loop

public class BuggyBread{
public static void main (String args[]) {
   int x = 50;
   for(int i=1;i <= 100;i++){
      if(i<=50){
         System.out.println(i*2);
      } else {
         System.out.println(i-x);
         x = x - 1;
      }
   }
}
}

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 Q351. Given two files with list of words, write a program to show the common words in both filesCore Java
Ans. import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.io.*;
public class Common {
public static void main(String ar[])throws Exception
   {
      File f=new File("a.txt");
File f1=new File("x.java");
      System.out.println(f.exists());
FileInputStream fin = new FileInputStream(f);
      FileInputStream fin1 = new FileInputStream(f1);

      byte b[]=new byte[10000];
byte b1[]=new byte[10000];
fin.read(b);
fin1.read(b1);
String s1 = new String(b);
String s2 =new String(b1);

String words1[] = s1.trim().split(" ");
String words2[] = s2.trim().split(" ");
Listlist1 = new ArrayList<>(Arrays.asList(words1));
Listlist2 = new ArrayList<>(Arrays.asList(words2));
list1.retainAll(list2);
System.out.println(list1);
}
}

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 Q352. What is the difference between for and foreach loop in java ? Which one should be used in which cases ?

Core Java
Ans. 1. for loop in java is used with a counter as following

for(int counter=0;counter < 50;counter++){
System.out.println(list.get(counter));
}

for iterating and printing the contents of a collection

whereas foreach loop can be specified directly without the use of counter

for(String str:list){
System.out.println(list.get(counter));
}

2. for Each loop syntax is more clean if we have to iterate over the elements of a collection and we need not keep track of the record count

3. For is preferred when we need loops without the usage of collections or Array of objects and entirely primitives are being used

4. for loop is preferred if we need to keep track of record count and have to perform some action of the basis of that. For example - If we have to print something after every 5 records, With for each loop in such case, we will have to keep a separate counter.

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 Q353. Does java supports operator overloading ?Core Java
Ans. No

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  Q354. What is database Normalization ?Database
Ans. https://en.wikipedia.org/wiki/Database_normalization

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 Q355. When is the situation when finally section won't execute ?Core Java
Ans. If the process / app is abruptly killed or terminated.

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 Q356. Explain various Searching and Sorting Algorithms ?Algorithm
 This question was recently asked at 'HeadStrong,ServiceNow'.This question is still unanswered. Can you please provide an answer.


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 Q357. Is it a good practice to use Asterick(*) in import statement to load multiple packages with single import statement ?Core Java
Ans. No, we should be lean in loading only packages which are required. Loading packages which are not being used result in memory overheads.

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 Q358. What is a Servlet Filter ?Java EE
Ans. It's an object that can intercept http request and response and hence we can take appropriate action on those requests.

There are different types of filters based on Specifications like

Authentication
Logging
Encryption
Tokenizing

etc

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 Q359. Can we override wait() or notify() methods?Core Java
Ans. wait and notify are declared final in object class and hence cannot be overridden.

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 Q360. Write an algorithm / Java Program to show duplicates in an array of n elements?Algorithm
Ans. int duplicateArray[] = { 1, 2, 2, 3, 4, 5, 6, 8, 9}
Set unique = new HashSet();
for (int i = 0; i < duplicateArray.length; i) {
if (unique.contains(duplicateArray[i])) {
System.out.println(duplicateArray[i]);
} else {
unique.add(duplicateArray[i]);
}
}

Complexity O(n) = nHashSet contains and add has O(n) = 1

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