Poker game: creating a deck with java

I am working on a project to create a poker game. Although the instructions are pretty clear, I have so many problems with object oriented programming.

So, for this project we need to create four objects: Card, Deck, Hand and Poker Hand. I have already finished creating the card object, and now I am working on the deck object. This is the area in which I have problems right now. I tried to deal with my problem. However, since I am so new to programming, I really don't get their methods. For example, I do not know how to use ArrayList. I know only the basic methods of the array.

The following code is what I have done so far for the Deck object:

import java.util.*;

public class Deck {

    public static final int CARDS_IN_DECK = 52;
    public static final int SHUFFLE_SWAPS = 700;
    int shufflex = 0;

    private Card[] cards;
    private int card_holder;
    private int seed;

    public Deck(int seed) {
        this.cards = new Card[CARDS_IN_DECK];

        seed = 0;

        for (int i = 2; i <= 14; i++) {
            for (int j = 0; j <= 3; j++) {

                if (j == 0) {
                    cards[seed] = new Card(i, 'c'); // c = Clubs

                } else if (j == 1) {
                    cards[seed] = new Card(i, 'd'); // d == Diamond

                } else if (j == 2) {
                    cards[seed] = new Card(i, 's'); // s== Spade

                } else if (j == 3) {
                    cards[seed] = new Card(i, 'h'); // h = Heart
                }
                seed++;
            }
        }

    }

    public void shuffle(){
        Random rand = new Random ();
        int randomNumber = rand.nextInt(51);
        int randomNumber2 = rand.nextInt(51);

        while( shufflex < SHUFFLE_SWAPS ){

            HOW DO I DO THE SWAP HERE? DON'T KNOW THE SYNTAX
            I KNOW I NEED TO CREATE ANOTHER ARRAY TO TEMPORARY STORE THE FIRST CARD
            THEN I REPLACE THE FIRST CARD WITH THE SECOND CARD
            AND THEN REPLACE THE SECOND CARD WITH THE TEMPORARY CARD

            shufflex++;
        }
    }

    public Card nextCard() {

    }

    public String toString() {

    }
}

And here are the descriptions for this part:

Deck 52 . .

, Deck. .

: CARDS_IN_DECK - . 52. SHUFFLE_SWAPS - , . , . 500.

: , CARDS_IN_DECK . . , , . 0 1 (. ). , , .

, .

public Deck(int seed) - Deck. , 52 , "CARDS_IN_DECK". . ( 2-14 ), . seed . . Card.CLUBS, Card.LOWEST_VALUE .. .

public void shuffle() - . , Random . 0-51. . , 20 11, 2 20 , 3 11 , , , 20 3 11 2 . , "SHUFFLE_SWAPS" , . -1, . , , . ,

Random rand = new Random(seed); -1, , , . ,

Random rand = new Random(); , , , , reset 0.

public Card nextCard() - , , , . , , , ( 1).

public String toString() - , Unit Testing. : toString() Card .

, public Deck (int seed). ? (int value, char suit), (int, char). , . -, , ?