Memory Game

memory/Memory.java

@@ -0,0 +1,184 @@
+import java.util.*;
+
+public class Memory {
+  static final String ANSI_CLS = "\u001b[2J";
+  static final String ANSI_HOME = "\u001b[H";
+
+  public static void main(String[] args) {
+    Game g = new Game();
+  }
+}
+
+class Game {
+  boolean quit = false;
+  int numCards = 16;
+  Card[] cards;
+  Random rnd = new Random(new Date().getTime());
+  int gameState = 0;
+  int selRow1, selCol1, selRow2, selCol2;
+  int foundMatches = 0;
+  int badMatches = 0;
+  String errMessage = "";
+
+  public Game() {
+    initializeDeck();
+    resetInput();
+
+    while(!quit) {
+      clearScreen();
+      drawScreen();
+      int inp = getUserInput();
+      handleInput(inp);
+    }
+    System.out.println("Thanks for playing!");
+    System.out.println("");
+  }
+
+  public void initializeDeck() {
+    cards = new Card[numCards];
+    for(int i = 0; i < numCards; i++) {
+      cards[i] = new Card(-1);
+    }
+    for(int i = 0; i < numCards/2; i++) {
+      int idx = rnd.nextInt(numCards);
+      while(cards[idx].value != -1) {
+        idx = rnd.nextInt(numCards);
+      }
+      cards[idx].value = i;
+      while(cards[idx].value != -1) {
+        idx = rnd.nextInt(numCards);
+      }
+      cards[idx].value = i;
+    }
+  }
+
+  public void drawScreen() {
+    printScore();
+    if(gameState == 0 || gameState == 2) {
+      System.out.println("   0 1 2 3");
+    } else {
+      System.out.println("          ");
+    }
+    System.out.println("   v v v v");
+    int row = 0;
+    for(int i = 0; i < numCards; i++) {
+      int sqrt = (int)Math.sqrt(numCards);
+      if(i % sqrt == 0) {
+        if(gameState == 1 || gameState == 3) {
+          System.out.print(row+">");
+        } else {
+          System.out.print(" >");
+        }
+      }
+      System.out.print(" ");
+      cards[i].Draw();
+      if(i % sqrt == sqrt-1) {
+        System.out.println("");
+        row++;
+      }
+    }
+    if(!"".equals(errMessage)) {
+      System.out.println(errMessage);
+    }
+    if(gameState == 0 || gameState == 2) {
+      System.out.print("Select Column: ");
+    } else if(gameState == 1 || gameState == 3) {
+      System.out.print("Select Row: ");
+    }
+  }
+
+  public void resetInput() {
+    selRow1 = selCol1 = -1;
+    selRow2 = selCol2 = -1;
+  }
+
+  public void handleInput(int i) {
+    int sqrt = (int)Math.sqrt(numCards);
+    if(gameState == 0) {
+      selCol1 = i;
+      hideUnsolvedCards();
+      errMessage = "";
+    } else if(gameState == 1) {
+      selRow1 = i;
+      cards[(selRow1*sqrt)+selCol1].visible = true;
+    } else if(gameState == 2) {
+      selCol2 = i;
+    } else if(gameState == 3) {
+      selRow2 = i;
+      cards[(selRow2*sqrt)+selCol2].visible = true;
+      int crd1 = (selRow1*sqrt)+selCol1;
+      int crd2 = (selRow2*sqrt)+selCol2;
+      if(selRow1 == selRow2 && selCol1 == selCol2) {
+        errMessage = "That's the same card...";
+      } else {
+        if(cards[crd1].value == cards[crd2].value) {
+          cards[crd1].solved = true;
+          cards[crd2].solved = true;
+          foundMatches++;
+        } else {
+          badMatches++;
+        }
+      }
+      resetInput();
+      if(foundMatches >= numCards) {
+        quit = true;
+        System.out.println("YOU WIN!");
+        printScore();
+      }
+    }
+    gameState = (gameState+1) % 4;
+  }
+
+  public void printScore() {
+    System.out.println("Matches: "+foundMatches+"/"+(numCards/2)+" ("+badMatches+" Incorrect)");
+  }
+
+  public void clearScreen() {
+    System.out.println(Memory.ANSI_CLS+Memory.ANSI_HOME);
+    System.out.flush();
+  }
+
+  public void hideUnsolvedCards() {
+    for(int i = 0; i < numCards; i++) {
+      cards[i].visible = false;
+    }
+  }
+
+  public int getUserInput() {
+    Scanner r = new Scanner(System.in);
+    String inp = "";
+    int ret = -1;
+    while(ret == -1) {
+      inp = r.nextLine();
+      if("q".equals(inp) || "quit".equals(inp) || "exit".equals(inp)) {
+        quit = true;
+        ret = -2;
+      } else {
+        try {
+          ret = Integer.parseInt(inp);
+        } catch(Exception e) { 
+          ret = -1;
+        }
+      }
+    }
+    return ret;
+  }
+}
+
+class Card {
+  boolean visible = false;
+  boolean solved = false;
+  int value;
+
+  public Card(int v) {
+    this.value = v;
+  }
+
+  public void Draw() {
+    if(this.visible || this.solved) {
+      System.out.print(this.value);
+    } else {
+      System.out.print("#");
+    }
+  }
+}