P6-P15: init

Signed-off-by: Amneesh Singh <natto@weirdnatto.in>

P13.java

@@ -0,0 +1,99 @@
+import java.applet.*;
+import java.awt.*;
+import java.awt.event.*;
+
+public class P13 extends Applet {
+    private Button[] buttons;
+    private Label statusLabel;
+    private int currentPlayer;
+
+    public void init() {
+        setLayout(new BorderLayout());
+
+        buttons = new Button[9];
+        for (int i = 0; i < 9; i++) {
+            buttons[i] = new Button("");
+            buttons[i].addActionListener(new ButtonClickListener());
+        }
+
+        statusLabel = new Label("Player 1's turn");
+        statusLabel.setAlignment(Label.CENTER);
+
+        Panel buttonPanel = new Panel(new GridLayout(3, 3));
+        for (int i = 0; i < 9; i++) {
+            buttonPanel.add(buttons[i]);
+        }
+
+        add(buttonPanel, BorderLayout.CENTER);
+        add(statusLabel, BorderLayout.SOUTH);
+        currentPlayer = 1;
+    }
+
+    private class ButtonClickListener implements ActionListener {
+        public void actionPerformed(ActionEvent e) {
+            Button clickedButton = (Button) e.getSource();
+            int buttonIndex = -1;
+
+            for (int i = 0; i < 9; i++) {
+                if (buttons[i] == clickedButton) {
+                    buttonIndex = i;
+                    break;
+                }
+            }
+
+            if (!clickedButton.getLabel().equals("") || isGameOver()) {
+                return;
+            }
+
+            if (currentPlayer == 1) {
+                clickedButton.setLabel("X");
+                currentPlayer = 2;
+                statusLabel.setText("Player 2's turn");
+            } else {
+                clickedButton.setLabel("O");
+                currentPlayer = 1;
+                statusLabel.setText("Player 1's turn");
+            }
+
+            if (isGameOver()) {
+                if (currentPlayer == 1) {
+                    statusLabel.setText("Player 2 wins!");
+                } else {
+                    statusLabel.setText("Player 1 wins!");
+                }
+            } else if (isBoardFull()) {
+                statusLabel.setText("It's a draw!");
+            }
+        }
+    }
+
+    private boolean isGameOver() {
+        String[] symbols = { "X", "O" };
+        int[][] winCombinations = {
+            { 0, 1, 2 }, { 3, 4, 5 }, { 6, 7, 8 },
+            { 0, 3, 6 }, { 1, 4, 7 }, { 2, 5, 8 },
+            { 0, 4, 8 }, { 2, 4, 6 }
+        };
+
+        for (int[] combination : winCombinations) {
+            String symbol = buttons[combination[0]].getLabel();
+            if (!symbol.equals("") &&
+                symbol.equals(buttons[combination[1]].getLabel()) &&
+                symbol.equals(buttons[combination[2]].getLabel())) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    private boolean isBoardFull() {
+        for (Button button : buttons) {
+            if (button.getLabel().equals("")) {
+                return false;
+            }
+        }
+
+        return true;
+    }
+}