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 Q1831. Write a Program to print permutations of a String.Core Java
Ans. public static Stream permutations(String str) {
if (str.isEmpty()) {
return Stream.of("");
}

return IntStream.range(0, str.length()).boxed()
.flatMap(i -> permutations(str.substring(0, i) str.substring(i 1)).map(t -> str.charAt(i) t));

}

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   Like         Discuss         Correct / Improve          Asked in 2 Companies

 Q1832. How to delete duplicate elements in a table ?Database
Ans. DELETE FROM TABLE WHERE ROW_NUM NOT IN ( SELECT MAX(ROW_ID) FROM TABLE GROUP BY DUPLICATE_FIELD )

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   Like         Discuss         Correct / Improve          Asked in 3 Companies

 Q1833. 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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 Q1834. 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

 Q1835. What is the difference between http and https ?Java EE
Ans. https encrypts the data using SSL whereas http sends it as plain text, So https is secure protocol whereas http is not.

Moreover https connects on port 443, while HTTP is on port 80

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   Like         Discuss         Correct / Improve     http  https  web protocols     Asked in 1 Companies        basic

 Q1836. What is a web service ?Java EE
Ans. A Web service is a service offered by one system to another, for communication over web through http. XML are JSON are usually used for sending across information from one system to another.

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   Like         Discuss         Correct / Improve     web service     Asked in 2 Companies      basic        frequent

 Q1837. How would you process a 20 gb file with an application only having access to 4gb memory ?BigData
Ans. Load the file in chunks and then process. If we need to do analytic, we can process analytic information for those chunks and then reprocess the processed information from each chunk.

For example - we need to average all marks in the file. We can divide the file and load into 5 chunks and calculate average for each chunk. Then we can collect averages for all 5 chunks and then calculate the final average.

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   Like         Discuss         Correct / Improve     bigdata  processing big data     Asked in 1 Companies

Frequently asked in Alibaba (Based on 2 feedback)
 Q1838. What is the best Memory setting for JVM ?Core Java
Ans. In Java JVM memory settings is done by use the arguments -Xms -Xmx. Use M or G after the numbers for indicating Megs and Gigs of bytes respectively. -Xms indicates the minimum and -Xmx the maximum.

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   Like         Discuss         Correct / Improve     jvm  memory management  jvm best memory setting     Asked in 1 Companies      intermediate

 Q1839. Can you write a "Hello World" program without using any ";" within it?Core Java
Ans. Yes, That is possible

class A {
public static void main(String args[]){
if(System.out.printf("Hello World")==null){}
}
}

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   Like         Discuss         Correct / Improve     Hello World  Hello world without ;     Asked in 2 Companies        rare

 Q1840. What is the difference between following time formats ?

hh:mm:ss
HH:mm:ss
kk:mm:ss
KK:mm:ss		Core Java
Ans. hh= hours in 1-12 format
HH= hours in 0-23 format
kk = Hours in 1-24 format
KK= hours in 0-11 format

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   Like         Discuss         Correct / Improve     Date  Date Time Format  Date Time

 Q1841. Have you ever tried mocking static methods ?Testing
Ans. Yes, that can be done using Power Mock. Mockito doesnt provide a way to mock static methods.

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   Like         Discuss         Correct / Improve     Mockito  junit  powermock     Asked in 1 Companies

 Q1842. How Promotions are created and stored in WCS ?IBM WCS
Ans. Promotions are created either using Management Center or Accelerator. PX_PROMOTION table is used to store Promotions. Complete Promotion is stored as an XML string within XMLPARAM column. Other tables which are used to store promotion related information are -

CATENTCALCD
CALCODE
CLCDPROMO

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 Q1843. Difference between JDBC and Hibernate ?Database
Ans. JDBC is a standard Java Api for Database communication whereas Hibernate is an ORM framework that uses JDBC to connect with Database.

Hibernate is another layer of object table mapping over JDBC that provide a database independent, object oriented and an efficient way of database communication.

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   Like         Discuss         Correct / Improve     JDBC  Hibernate  JDBC vs Hibernate     Asked in 3 Companies

Frequently asked in high end product companies. Frequently asked in Deloitte.
  Q1844. How is Hashmap internally implemented in Java ?Core Java
Ans. https://medium.com/javarevisited/internal-working-of-hashmap-in-java-97aeac3c7beb#:~:text=HashMap%20internally%20uses%20HashTable%20implementation,the%20entries%20into%20the%20map.

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   Like         Discuss         Correct / Improve     hashmap  collections  hashmap internal implementation     Asked in 20 Companies      expert        frequent

 Q1845. 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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   Like         Discuss         Correct / Improve     object initialization  object declaration   runtime polymorphism  object oriented programming (oops)  oops concepts

Very Frequently asked to Senior Software Engineers or Developers.
  Q1846. 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

 Q1847. 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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   Like         Discuss         Correct / Improve     coding  code  find max number in an array     Asked in 1 Companies

Frequently asked Generic Question.
  Q1848. Why do you want to work for our company ?General
Ans. [Open Ended Answer]

Usually answered stating your keen interest in the role offered and challenges and opportunities the role offers.

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   Like         Discuss         Correct / Improve          Asked in 42 Companies        frequent

 Q1849. Difference between Static and Singleton Class ?Core Java
Ans. 1. Static class is a class which cannot be instantiated and all its members are static whereas Singleton is the class that only permit creation of single object and then the object is reused.

2. As there is no object in Static class, it cannot participate in runtime Polymorphism.

3. As Static class doesnt allow creating objects and hence it cannot be serialized.

4. Static class body is initialized eagerly at application load time whereas Singleton object can be initiated eagerly using static blocks or lazily on first need.

5. Its not recommended to use pure static class as it fails to use many OOPs concepts.

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   Like         Discuss         Correct / Improve     Static Class  Singleton  Static Class vs Singleton     Asked in 3 Companies      Intermediate        frequent

  Q1850. Write a Program to check if 2 strings are Anagrams ?Core Java
Ans. public void checkIfAnagram(String str1,String str2){
boolean anagram = true;
for(char c:str1.toCharArray()){
if(!str2.contains(String.valueOf(c))){
System.out.println("Strings are Anagrams");
anagram = false;
}

if(anagram == true){
System.out.println("Strings are not Anagrams");
}
}
}

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   Like         Discuss         Correct / Improve      check if 2 strings are Anagrams     Asked in 30 Companies      basic        frequent

 Q1851. Write a Program to add 1-100, 101-200, 201-300 in different threads and then sum the numbers ?Core Java
Ans. public class TotalUsingThreads extends Thread{
   
   private static List<TotalUsingThreads> collector = new ArrayList<TotalUsingThreads>();
   
   private int startFrom = 0;
   
   private Integer threadTotal = null;
   
   Test(int startFrom){
      this.startFrom = startFrom;
   }
   
   
   public static void main(String[] args) throws InterruptedException{
      int totalSum = 0;
      
      // Create all the threads and set the count starting point for all of them
      for(int count=0;count<10;count++){
         TotalUsingThreads newThread = new TotalUsingThreads(count*100);
         newThread.start();
         collector.add(newThread);
      }
      
      boolean allCollected = false;
      
      
      // Make sure that all thread totals are collected and all threads have completed their tasks
      while(!allCollected){
         for(int count=0;count<10;count++){
            if(collector.get(count).threadTotal == null){
               Thread.sleep(100);
               break;
            }
         }
         allCollected = true;
      }
      
      // sum totals of all threads
      for(int count=0;count<10;count++){
         totalSum += collector.get(count).threadTotal;
      }
      
      System.out.println(totalSum);
      
      
   }
   
   public void run(){
      threadTotal = 0;
      for(int count=startFrom;count<startFrom+100;count++){
       threadTotal += count;   
      }
   }
}

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 Q1852. Can there be a Thread without a Process ?Core Java
Ans. No.

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   Like         Discuss         Correct / Improve     Thread  Process     Asked in 1 Companies      Basic

 Q1853. How would you count the number of words in a string consisting of uneven number of spaces between words( not dictionary words)? With and without library functions.Core Java
Ans. package com.string;

import java.util.Scanner;

public class String13 {
public static void main(String[] args) {
System.out.println("Enter Sentence");
Scanner sc=new Scanner(System.in);
String sentence=sc.nextLine();
String[] words=sentence.split(" ");
int count=0;
for (String string : words) {
string.trim();
if(!string.equals("")){
count++;
System.out.println(string " " count);
}
}
}
}

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 Q1854. What is the most used Java Class ?Core Java
Ans. Object class as its the parent class of all Java classes.

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 Q1855. Explain Agile Software Development Methodology ?Process
Ans. https://en.wikipedia.org/wiki/Agile_software_development

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   Like         Discuss         Correct / Improve     software development process  agile     Asked in 5 Companies        frequent

 Q1856. Have you ever had any conflict with the team member (like disagreement on some design decision ) and How you reacted to it ? General
Ans. [Open Ended Answer]

This is a very sensitive question and should be dealt with caution. Just simply saying that you never had any disagreement will present you as dumb team member. Showing your self as too aggressive in such decisions will present you as a trouble maker. You should present a situation where you had an argument / disagreement but eventually you and your team mates mutually found a way out of it.

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   Like         Discuss         Correct / Improve          Asked in 20 Companies      basic

 Q1857. How is String class unique ?Core Java
Ans. String class is immutable as well as final. Because of these properties , String objects offer many benefits

1. String Pool - When a string is created and if it exists in the pool, the reference of the existing string will be returned instead of creating a new object. If string is not immutable, changing the string with one reference will lead to the wrong value for the other references.

Example -

String str1 = "String1";
String str2 = "String1"; // It doesnt create a new String and rather reuses the string literal from pool

// Now both str1 and str2 pointing to same string object in pool, changing str1 will change it for str2 too

2. To Cache its Hashcode - If string is not immutable, One can change its hashcode and hence its not fit to be cached.

3. Security - String is widely used as parameter for many java classes, e.g. network connection, opening files, etc. Making it mutable might possess threats due to interception by the other code segment.

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   Like         Discuss         Correct / Improve     immutable  immutability  immutability  String  string class     Asked in 1 Companies

 Q1858. Write an Algorithm for Graph Traversal ? The Graph has a loop.Algorithm
Ans. Please not that all such questions can be easily answered through recursion.

Simple recursive implementation could be

traverse(root);

void traverse(Element element){
if(element.hasNext()){
traverse(element.next());
} else {
System.out.println(element);
}
}

but this algo / code lead to endless loop if there is a loop in graph traversal.

So you can keep a collection to keep track of which elements have laready been traversed


static List<Elements> listOfAlreadyTraversedElements = new ArrayList<Elements>();

main(){
traverse(root);
}

void traverse(Element element){
if(element.hasNext()){
traverse(element.next());
} else {
listOfAlreadyTraversedElements.add(element);
System.out.println(element);
}
}

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   Like         Discuss         Correct / Improve     graph traversal algorithm  graph traversal algorithm using recursion     Asked in 1 Companies      intermediate

 Q1859. Can we start the same thread twice ?Core Java
Ans. No we cannot start the same thread twice. Each thread has a lifecycle.

But Yes, we can run the same code in parallel using different threads.


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 Q1860. What is a shutdown hook ?Core Java
Ans. Shutdown hook is a thread that is invoked implicitly by JVM just before the shut down. It is used to clean up unused resources.

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