Write a java program to Remove duplicate characters in a given String ?

Write a java program to Remove duplicate characters in a given String ?

import java.util.LinkedHashSet;

import java.util.Scanner;

import java.util.Set;

public class RemoveDuplicateCharacters {

      public String removeDuplicates(String input) {

            Set<Character> set = new LinkedHashSet<>();

            for (int i = 0; i < input.length(); i++) {

                  set.add(input.charAt(i));

            }

            StringBuilder sb = new StringBuilder();

            for (Character c : set) {

                  sb.append(c);

            }

            return sb.toString();

      }

      public static void main(String[] args) {

            RemoveDuplicateCharacters rd = new RemoveDuplicateCharacters();

            Scanner scanner = new Scanner(System.in);

            System.out.println("Please enter a String:");

            String input = scanner.next();

            System.out.println("RESULT IS : "+rd.removeDuplicates(input));

      }

}

Ouput:

Please enter a String:

mmmaaadddhhhuuu

RESULT IS : madhu 

What is Differences between Hadoop and RDBMS ?

Diffrences Between Hadoop And RDBMS

	RDBMS	HADOOP
Data size	Gigabytes	Petabytes
Access	Interactive and batch	Batch
Updates	Read and write many	Write and read many
Structure	Static schema	Dynamic schema
Integrity	High Normalisation	Low Normalisation
Scalling	Non Linear	Linear

What is differences between Apache Hive and RDBMS ?

What is differences between Apache Hive and RDBMS ?

Hive	RDBS
SQL  Interface	SQL  Interface
Focus  on  analytics	May  focus  on  online  or  analytics.
No  transactions.	Transactions  usually  supported.
Partition  adds,  no  random  INSERTs. In‐Place  updates  not  natively  supported   (but   are  possible).	Random  INSERT  and  UPDATE  supported.
Distributed  processing  via  map/reduce.	Distributed  processing  varies  by  vendor   (if  available).
Scales  to  hundreds  of  nodes	Seldom  scale  beyond  20  nodes
Built  for  commodity  hardware	Often  built  on  proprietary  hardware   (especially  when  scaling  out).
Low  cost  per  peta byte.	What’s  a  peta byte? J

Write a Java Program Without using reverse function?

Write a Java Program Without using reverse Funtion?

import java.util.Scanner;

public class ReverseStringWithoutReverseFunction {

       public static String reverse(String str) {

              StringBuilder sb = new StringBuilder();

              char[] string = str.toCharArray();

              for (int i = string.length - 1; i >= 0; i--) {

                     sb.append(string[i]);

              }

              System.out.println(sb.toString());

              return sb.toString();

       }

       public static void main(String[] args) {

              Scanner keyboard = new Scanner(System.in);

              System.out.println("Enter a String:");

              String input = keyboard.next();

              reverse(input);

       }

}