java - How to apply suits to the cards in matching game? -

basically, project description asks user create matching game, consisting of:

1. a blueprint creation of playing card attributes are: suit, face value, faceup status, , optional unicode value suit icon
2. a 2 dimensional playing table (4x4), 16 pairs of matching cards, , running count of number of face-down cards. include method retrieve specific card table @ input x,y position.
3. a gameboard, , loop continues play until cards remain face up. loop includes interface user pick 2 cards (inputting x,y table positions), checking if 2 cards equal, decrementing count of facedown cards, , setting faceup boolean of cards. essnetially, program should run until cards face up, , game won. separated program in 4 separate classes below.

1.

public class card { private final int cardvalue; private boolean faceup;  public card(int value) {     cardvalue = value;     faceup = false; }  public int getvalue() {     return cardvalue; }  public boolean isfaceup() {     return faceup; }  public void setfaceup(boolean input) {     faceup = input; }  public static void printboard(card[][] cards) {     system.out.println("\t\t1\t2\t3\t4");     system.out.println("\t____________");      for(int = 0; < cards.length; i++) {         system.out.println((i + 1) + "\t|\t");          for(int j = 0; j < cards[0].length; j++)             if(cards[i][j].isfaceup()) {                 system.out.print(cards[i][j].getvalue() + "\t"); }             else                 system.out.println("*\t");      }     system.out.println(); }  } 

2.

public class createboard {  public static card[][] createboard() {     card[][] board = new card[4][4];      for(int = 1; <= 8; i++) {         for(int j = 1; j <= 2; j++) {              boolean boardlocation = false;              while(!boardlocation) {                 int row = (int)(math.random() * 4);                  int column = (int)(math.random() * 4);                  if(board[row] == null && board[column] == null) {                     boardlocation = true;                     board[row][column] = new card(i);                     }                 }             }         }                 return board;     } } 

3.

public class game {     public static boolean wongame(card[][] board) {         for(int = 0; < board.length; i++) {             for(int j = 0; j < board[0].length; j++) {                 if(!board[i][j].isfaceup())                     return false;             }         }                     return true;     }  } 

and finally, main class:

public class gamedriver {     public static void main(string[] args) {         card[][] board = createboard.createboard();         scanner keyboard = new scanner(system.in);          system.out.println("starting game...");          while(!game.wongame(board)) {             card.printboard(board);              system.out.println("enter x-coordinate #1 (1-4): ");             int column1 = keyboard.nextint();              system.out.println("enter y-coordinate #1 (1-4): ");             int row1 = keyboard.nextint();              system.out.println("enter x-coordinate #2 (1-4): ");             int column2 = keyboard.nextint();              system.out.println("enter y-coordinate #2 (1-4): ");             int row2 = keyboard.nextint();              card card1 = board[row1][column1];             card card2 = board[row2][column2];              if(card1.getvalue() == card2.getvalue() && !(row1 == row2 && column1 == column2))              {                 card1.setfaceup(true);                 card2.setfaceup(true);             }              else if(row1 == row2 && column1 == column2)             {                 system.out.println("points selected same, try again");             }              else             {                 system.out.println(card1.getvalue() + " , "  + card2.getvalue() + " not match");              }         }             card.printboard(board);     } } 

code runs perfectly, clueless on how add suits card. need 2 suits applied every card on board (hearts , diamonds example, if code produced 2 4s, 1 hearts , 1 diamonds) know use enumeration, don't understand how work. appreciated!

here's guide enums recommend read. it's quick reading, plenty of examples. java tutorials pretty useful.

here's code can use.

public enum suit {     hearts     ,spades     ,diamonds     ,clubs }  public class card {     private final int cardvalue;     private final suit suit;     private boolean faceup;      public card(int value, suit suit) {          this.cardvalue = value;          this.faceup = false;          this.suit = suit;     }     // ...snip...     public suit getsuit() {         return this.suit;     } } 

and you'd construct card call like:

card mycard = new card(3, suit.hearts); 

i recommend not take advice of using set of char values. why? bunch of reasons. 1 thing, if use enum type, know can't accidentally pass invalid value; typo can't screw entire program. another, don't need pass around list of acceptable chars everywhere, or- worse- have switch-case or if-statement checking every possible value every time , throwing error if uses invalid value.

then there's fact that, if use 1 char per enum value, enum values can't have meaningful names (how supposed figure out 'c' , 's' mean?), whereas there's little ambiguity in suit.clubs or suit.spades (and, remember, code written people, not computers. suspicious of inexperienced enough argue otherwise).