HashMap-> First Recurring character

import java.util.*;
class Main {
    
    public static int returnFirstRec(int[] qstn){
        HashMap<Integer, Integer> map = new HashMap();
        for(int i=0;i<qstn.length;i++){
            if(!map.containsKey(qstn[i])){
                map.put(qstn[i], 1);
            }
            else{
                 return qstn[i];
            }
        }
        return -1;
    }
    
    public static void main(String[] args) {
        int[] qstn = {2,5,1,2,3,4};
        System.out.println(returnFirstRec(qstn));
    }
}