Duplicates_InWord.java

// WAP to find the duplicate character in a String/word
import java.util.Scanner;

public class Duplicates_InWord {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.print("Enter word: ");
        String str = sc.nextLine();
        sc.close();
        str = str.toLowerCase();  // to remove java case sensitiveness property
        int[] charCounts = new int[256];
        System.out.print("Duplicate Character are: ");
        boolean foundDuplicates = false;
        for (int i = 0; i < str.length(); i++) {
            charCounts[str.charAt(i)]++; // Increment the count for each element and store it in the array
            // If the count becomes 2, it's the first time we've detected this duplicate
            if (charCounts[str.charAt(i)] == 2) {
                System.out.print(str.charAt(i) + " ");
                foundDuplicates = true;
            }
        }
        if(!foundDuplicates){
            System.out.println("None");
        } 
    }
}