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Java program to delete duplicate characters from a given String
The interface Set does not allow duplicate elements, therefore, create a set object and try to add each element to it using the add() method in case of repetition of elements this method returns false −
If you try to add all the elements of the array to a Set, it accepts only unique elements so, to find duplicate characters in a given string
- Convert it into a character array.
- Try to insert elements of the above-created array into a hash set using add method.
- If the addition is successful this method returns true.
- Since Set doesn't allow duplicate elements this method returns 0 when you try to insert duplicate elements
- Print those elements
Example
import java.util.HashSet;
import java.util.Scanner;
import java.util.Set;
public class DuplicateCharacters {
public static void main(String args[]){
Scanner sc = new Scanner(System.in);
System.out.println("Enter the required string value ::");
String reqString = sc.next();
char[] myArray = reqString.toCharArray();
System.out.println("indices of the duplicate characters in the given string :: ");
Set set = new HashSet();
for(int i=0; i<myArray.length; i++){
if(!set.add(myArray[i])){
System.out.println("Index :: "+i+" character :: "+myArray[i]);
}
}
}
}Output
Enter the required string value :: malayalam indices of the duplicate characters in the given string :: Index :: 3 character :: a Index :: 5 character :: a Index :: 6 character :: l Index :: 7 character :: a Index :: 8 character :: m
Updated on: 13-Mar-2020
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