PRINT AND SHUFFLE A DECK OF CARDS(HELP!)

Question

//What am I missing and doing wrong?
public class Card
{
class Card
{
int suit, rank;

public Card() {
this.suit = 0;
this.rank = 0;
}

public Card(int suit, int rank) {
this.suit = suit;
this.rank = rank;
}
public String printCard(Card c) {
String[] suits = {
"Clubs", "Diamonds", "Hearts", "Spades" };
String[] ranks = {
"narf", "Ace", "2", "3", "4", "5", "6",
"7", "8", "9", "10", "Jack", "Queen", "King"};
System.out.println(ranks[c.rank] + " of " + suits[c.suit]);
return ranks[this.rank] + " of " + suits[this.suit];
}

public static void printCard(Card c) {
String[] suits = {
"Clubs", "Diamonds", "Hearts", "Spades" };
String[] ranks = {
"narf", "Ace", "2", "3", "4", "5", "6",
"7", "8", "9", "10", "Jack", "Queen", "King"};
System.out.println(ranks[c.rank] + " of " + suits[c.suit]);

}

public static void shuffleArray(Card[] cards)
{
for (int i = 0; i <= cards.length; i++) {
swap(0, 100);
}
}

public static void swap(Card[] cards, int i, int j)
{
Card temp = this.cards[i];
this.cards[i] = this.cards[j];
this.cards[i] = temp;
}
public static void printStrings(String[] strs){
for (int i = 0; 1 < strs.length; i++) {
System.out.println(strs[i]);
}
}
public static void main(String[] args){
Card[] cards = new Card[52];

shuffleArray(cards);
printStrings(cards);

Answer 1

There are often just minor typos in the code. I am pretty sure you meant to write
Card temp = this.cards[i];
this.cards[i] = this.cards[j];
this.cards[j] = temp;
In your swap() method. Please notice the following:
1. You probably shouldn't put a class "Card" inside of another public class "Card". This only causes confusion.
2. Your cards are not initialized in your main()
3. Your way of shuffling isn't random at all.

Answer 2

I use a shuffle function in my C++ code here:

https://code.sololearn.com/csRrg99rE15g
It's really similar to java in many ways. I made two classes, one for cards and one is the deck, which handles everything else.

Answer 3

https://code.sololearn.com/cW5d1J7YjSTT/?ref=app
I used a safe shuffle here, quick easy and reliable.