interview QuesAnswer

Write a program to remove duplicates from sorted array. 

public class MyDuplicateElements {

    public static int[] removeDuplicates(int[] input){

         

        int j = 0;

        int i = 1;

               if(input.length < 2){

            return input;

        }

        while(i < input.length){

            if(input[i] == input[j]){

                i++;

            }else{

                input[++j] = input[i++];

            }   

        }

        int[] output = new int[j+1];

        for(int k=0; k<output.length; k++){

            output[k] = input[k];

        }

         

        return output;

    }

     

    public static void main(String a[]){

        int[] array = {2,6,6,6,8,9,10,10,3,11,11};

        int[] output = removeDuplicates(array);

        for(int i:output){

            System.out.print(i+" ");

        }

    }

}

Write a program to find out duplicate characters in a string.

import java.util.HashMap;

import java.util.Map;

import java.util.Set;

public class DuplicateCharsInString {

    public void findDuplicateChars(String str){

         

        Map<Character, Integer> dupMap = new HashMap<Character, Integer>();

        char[] chrs = str.toCharArray();

        for(Character ch:chrs){

            if(dupMap.containsKey(ch)){

                dupMap.put(ch, dupMap.get(ch)+1);

            } else {

                dupMap.put(ch, 1);

            }

        }

        Set<Character> keys = dupMap.keySet();

        for(Character ch:keys){

            if(dupMap.get(ch) > 1){

                System.out.println(ch+"--->"+dupMap.get(ch));

            }

        }

    }

     

    public static void main(String a[]){

        DuplicateCharsInString dcs = new DuplicateCharsInString();

        dcs.findDuplicateChars("Java2Novice");

    }

}