Amazon interview question - To find the first repeated character in a String

Question: How to find the first repeated character in a String?

The below java program has been written in easy way to make the beginners understand how easy the way of coding is and how easily a concept can be achieved through programming.

import java.util.Scanner;

public class StrRepeat {

public static void main(String args[]){

//Get the string to check the non repreated character

System.out.println("Enter the String: ");

Scanner s = new Scanner(System.in);

String str = s.nextLine();

char fin = checkLetter(str);

System.out.println("The character is: " + fin);

s.close();

}

//To check each individual char for non repeated

private static char checkLetter(String str) {

// TODO Auto-generated method stub

//To split the string to character

char[] ary = str.toCharArray();

char val = 0;

//To get the length of character

int len = ary.length;

char temp[] = new char[len];

for (int i=0; i<len; i++){

for (int j=0; j<len; j++){

if (j!= i){

if(ary[i] == ary[j]){

temp[i] = '$';

}

}

}

}

for (int k = 0; k< len; k++){

if (temp[k] == '$' ){

val = ary[k];

break;

}

}

return val;

}

}

Output:

Enter the String: lmadam

The character is: m