Remove Duplicate Character From String in Java using HashMap

 

In this Blog we are going to learn how to remove Duplicate Characters from a string in java using Hashmap

Code :

package learningJava;

import java.util.*;

public class Learnig {

public static void main(String[] args) {

String s = "aabbcaddbe"; //input String 

HashMap<Character,Integer> map = new HashMap<>();

String ans=""; //store our answer 

char[] input = s.toCharArray(); //converting string into array

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

if(!map.containsKey(input[i])) {

map.put(input[i], 1);

ans= ans+ input[i];

}

else {

map.put(input[i],1);

}

}

System.out.print(ans);

}

}

Output

abcde