Count common characters in two Strings

import java.util.*;
 public class Main{
 public static void main(String[] args)
    {
        Scanner sc=new Scanner(System.in);
        String s1=sc.nextLine();
        String s2=sc.nextLine(); 
        char c1[]=s1.toCharArray();
        char c2[]=s2.toCharArray();
        int n1 = c1.length;
        int n2 = c2.length;
        int x=0,t=0;
        int count=0;
        char k1[]= new char[n1];
        char k2[]= new char[n2];
        HashSet<Character> h1 = new HashSet<>(n1);
        for (char x1 : c1)
            h1.add(x1);
            for(char x1:h1){
                k1[x++]=x1;
            }
            HashSet<Character> h2 = new HashSet<>(n2);
        for (char x2 : c2)
            h2.add(x2);
            for(char x2:h2){
                k2[t++]=x2;
            }
            for(int i=0;i<n1;i++){
                for(int j=0;j<n2;j++){
                if(k1[i]==k2[j]){
                    count++;
                }}}
 System.out.print(count);
 }}