Java/Others/RemoveDuplicateFromString.java at dev · primary-code-test/Java · GitHub

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package Others;

import java.io.BufferedReader;

import java.io.InputStreamReader;

/** @author Varun Upadhyay (https://github.com/varunu28) */

public class RemoveDuplicateFromString {

public static void main(String[] args) throws Exception {

BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

String inpStr = br.readLine();

System.out.println("Actual string is: " + inpStr);

System.out.println("String after removing duplicates: " + removeDuplicate(inpStr));

br.close();

}

/**

* This method produces a string after removing all the duplicate characters from input string and

* returns it Example: Input String - "aabbbccccddddd" Output String - "abcd"

* @param s String from which duplicate characters have to be removed

* @return string with only unique characters

public static String removeDuplicate(String s) {

if (s == null || s.isEmpty()) {

return s;

}

StringBuilder sb = new StringBuilder();

int n = s.length();

for (int i = 0; i < n; i++) {

if (sb.toString().indexOf(s.charAt(i)) == -1) {

sb.append(String.valueOf(s.charAt(i)));

}

return sb.toString();

}