RemoveDuplicateFromString.java

packagecom.thealgorithms.others;

/**
 * @author Varun Upadhyay (https://github.com/varunu28)
 */
publicfinalclassRemoveDuplicateFromString {
privateRemoveDuplicateFromString() {
 }

/**
 * Removes duplicate characters from the given string.
 *
 * @param input The input string from which duplicate characters need to be removed.
 * @return A string containing only unique characters from the input, in their original order.
 */
publicstaticStringremoveDuplicate(Stringinput) {
if (input == null || input.isEmpty()) {
returninput;
 }

StringBuilderuniqueChars = newStringBuilder();
for (charc : input.toCharArray()) {
if (uniqueChars.indexOf(String.valueOf(c)) == -1) {
uniqueChars.append(c); // Append character if it's not already in the StringBuilder
 }
 }

returnuniqueChars.toString();
 }
}