Java - What is the best way to find first duplicate character in a string

Question

I have written below code for detecting first duplicate character in a string.

public static int detectDuplicate(String source) {
    boolean found = false;         


        

Answer 1

You could try with:

 public static char firstRecurringChar(String s)
    {
    char x=' ';
    System.out.println("STRING : "+s);
    for(int i =0;i