Lab1

app/src/main/java/labbar/Board.java

@@ -0,0 +1,40 @@
+package labbar;
+
+import java.util.Optional;
+
+public class Board {
+    private int pins = 10;
+    private String winner_id = null;
+
+    public Optional<String> getWinnder() {
+        if (winner_id == null) return Optional.empty();
+        return Optional.of(winner_id);
+    }
+
+    public void setUp(int pins) {
+        this.pins = pins;
+    }
+
+    public void takePins(int pins) {
+        this.pins -= Math.min(2, pins);
+        this.pins = Math.max(0, this.pins);
+    }
+
+    public void alert(String userId, int pins) {
+        if(this.pins <= 0) System.out.println(userId + String.format(" picks %d and wins!", pins));
+        else System.out.println(userId + " took " + pins + " pins.");
+    }
+
+    public void printState() {
+        printState(false);
+    }
+    public void printState(boolean lineBreak) {
+        System.out.println("There are " + this.pins + " pins left.");
+        if (lineBreak) System.out.println();
+    }
+
+    // GetPinsAmount
+    public int getNoPins() {
+        return pins;
+    }
+}

app/src/main/java/labbar/ComputerPlayer.java

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+package labbar;
+
+public class ComputerPlayer extends Player {
+    ComputerPlayer(String userId) {
+        super(userId);
+    }
+
+    @Override
+    int takePins(Board board) {
+        int n = Math.min(
+                (int) (Math.random()*2 + 1), // Random int between 1 and 2
+                board.getNoPins()
+                );
+        System.out.println(n);
+        board.takePins(n);
+        board.alert(this.getUserId(), n);
+        return n;
+    }
+}

app/src/main/java/labbar/HumanPlayer.java

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+package labbar;
+
+import javax.swing.JOptionPane;
+
+public class HumanPlayer extends Player {
+    HumanPlayer(String userId) {
+        super(userId);
+    }
+
+    @Override
+    int takePins(Board board) {
+        // Filter all non-digits from the input
+        String input = JOptionPane.showInputDialog("How many pins do you want to take?").chars()
+            .filter(Character::isDigit)
+            .collect(StringBuilder::new, StringBuilder::appendCodePoint, StringBuilder::append)
+            .toString();
+
+        
+        int i = Math.max(board.getNoPins(), Math.min(2, Integer.parseInt(input))); // "Should" never throw given input is sanitized
+        board.takePins(i);
+        board.alert(this.getUserId(), i);
+        return i;
+    }
+}

app/src/main/java/labbar/Player.java

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+package labbar;
+
+public abstract class Player {
+    String userId;
+
+    Player(String userId) {
+        this.userId = userId;
+    }
+
+    String getUserId() {
+        return userId;
+    }
+
+    abstract int takePins(Board board);
+}

app/src/main/java/labbar/TakePinsGame.java

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+package labbar;
+
+public class TakePinsGame {
+    public static void main(String[] args) {
+        Board board = new Board();
+        board.setUp(10);
+        board.printState();
+        
+        Player player = new ComputerPlayer("Human");
+        Player cpu = new ComputerPlayer("Computer");
+
+        for(boolean playerTurn = true; board.getNoPins() > 0; playerTurn = !playerTurn) {
+            if(playerTurn) player.takePins(board);
+            else cpu.takePins(board);
+            board.printState(true);
+        }
+    }
+}