Generate random deck card

generate_card.java

import java.util.Scanner;                                                  
import java.util.Random;

public class generate_card {
    public static void main (String[] args) {
        Scanner scan = new Scanner (System.in);
        int num_decks = scan.nextInt();
        int num_perDecks = scan.nextInt();
        //String suits[] = {"H","D","C","S"};
        String suits[] = {"\u2661", "\u2662", "\u2663", "\u2660"};
        String cards[] = {"2","3","4","5","6","7","8","9","10","J","Q","K","A"};
        for(int i=0;i<num_decks;i++){
            for(int j=0;j<num_perDecks;j++){
                Random random = new Random (); 
                int num = random.nextInt (cards.length * suits.length);
                System.out.print(cards[num % cards.length] + suits[num / cards.length]);
                System.out.print(" ");
            }
            System.out.println();
        }
    }   
}