Remove duplicate characters from string in java

Remove duplicate characters in a string

• We can remove duplicates characters from a given string using for loops, HashSet, indexOf() method.

import java.util.*;

public class removeDuplicatesFromString {

    public static void main(String[] args) {

    String str = "cbacdcbc3";

    String uniqueString = "";

    for (int i = 0; i <= str.length() - 1; i++) {

        char c = str.charAt(i);
        if (uniqueString.indexOf(c) < 0) {
            uniqueString = uniqueString + c;
        }

    }

    System.out.println("Remove duplicates using indexOf()=" + uniqueString);

    System.out.println("<<----------------------------------->>");
    Set<Character> s = new HashSet<>();
    
    for (int i = 0; i <= str.length() - 1; i++) {
        s.add(str.charAt(i));
    }
    
    String str1 = "";

    for (char c : s) {
        str1 = str1 + c;
    }
    System.out.println("Remove duplicates using HashSet=" + str1);
    
    System.out.println("<<----------------------------------->>");
    
    String distinct = "";
    
    for (int i = 0; i <= str.length() - 1; i++) {
        if (!distinct.contains(String.valueOf(str.charAt(i)))) {
            distinct += String.valueOf(str.charAt(i));
        }
    }
    System.out.println("Remove duplicates using for loop()=" + distinct);
    }
}

Output:
Remove duplicate characters from string in java

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