How can I select and delete 47 out of 52 choices in a set?

I can't find anything besides the basics on sets while searching on google. Any help with this will be appreciated.
My code:

import java.util.Random;
import java.util.Arrays;
import java.util.ArrayList;
import java.util.Set;
import java.util.HashSet;

public class cardGame {
  public static void main(String[] args) {
    Random sad = new Random();
    ArrayList<String> decka = new ArrayList<>(Arrays.asList("Ace of spades","2 of spades","3 of spades","4 of spades","5 of spades","6 of spades","7 of spades","8 of spades","9 of spades","10 of spades","Jack of spades","Queen of spades","King of spades","Ace of spades","2 of spades","3 of spades","4 of spades","5 of spades","6 of spades","7 of spades","8 of spades","9 of spades","10 of spades","Jack of spades","Queen of spades","King of spades","Ace of hearts","2 of hearts","3 of hearts","4 of hearts","5 of hearts","6 of hearts","7 of hearts","8 of hearts","9 of hearts","10 of hearts","Jack of hearts","Queen of hearts","King of hearts","Ace of diamonds","2 of diamonds","3 of diamonds","4 of diamonds","5 of diamonds","6 of diamonds","7 of diamonds","8 of diamonds","9 of diamonds","10 of diamonds","Jack of diamonds","Queen of diamonds","King of diamonds","Ace of clubs","2 of clubs","3 of clubs","4 of clubs","5 of clubs","6 of clubs","7 of clubs","8 of clubs","9 of clubs","10 of clubs","Jack of clubs","Queen of clubs","King of clubs"));
    ArrayList<String> trumpa = new ArrayList<>(Arrays.asList("spades","hearts","diamonds","clubs"));
    Set trump = new HashSet(Arrays.asList(trumpa));
    Set P1hand = new HashSet(Arrays.asList(decka));
    System.out.println("Boure hands and trump game.");
    System.out.println("");
    System.out.println(P1hand + "");
    }
}

And what I get right now is:

[[Ace of spades, 2 of spades, 3 of spades, 4 of spades, 5 of spades, 6 of spades, 7 of spades, 8 of spades, 9 of spades, 10 of spades, Jack of spades, Queen of spades, King of spades, Ace of spades, 2 of spades, 3 of spades, 4 of spades, 5 of spades, 6 of spades, 7 of spades, 8 of spades, 9 of spades, 10 of spades, Jack of spades, Queen of spades, King of spades, Ace of hearts, 2 of hearts, 3 of hearts, 4 of hearts, 5 of hearts, 6 of hearts, 7 of hearts, 8 of hearts, 9 of hearts, 10 of hearts, Jack of hearts, Queen of hearts, King of hearts, Ace of diamonds, 2 of diamonds, 3 of diamonds, 4 of diamonds, 5 of diamonds, 6 of diamonds, 7 of diamonds, 8 of diamonds, 9 of diamonds, 10 of diamonds, Jack of diamonds, Queen of diamonds, King of diamonds, Ace of clubs, 2 of clubs, 3 of clubs, 4 of clubs, 5 of clubs, 6 of clubs, 7 of clubs, 8 of clubs, 9 of clubs, 10 of clubs, Jack of clubs, Queen of clubs, King of clubs]]

Any help with this is appreciated as I am new to sets.