added lab10 ex1

src/lab10_memento/ex1/CheckpointManager.java

@@ -0,0 +1,17 @@
+package lab10_memento.ex1;
+
+public class CheckpointManager {
+    private Player.Checkpoint lastCheckpoint = null;
+
+    public void save(Player player) {
+        lastCheckpoint = player.makeCheckpoint();
+    }
+
+    public void restore(Player player) {
+        if (lastCheckpoint != null) {
+            lastCheckpoint.restore(player);
+        } else {
+            System.out.println("No checkpoint to restore");
+        }
+    }
+}

src/lab10_memento/ex1/Game.java

@@ -0,0 +1,60 @@
+package lab10_memento.ex1;
+
+public class Game {
+    private final Player player;
+    private final CheckpointManager checkpointManager;
+
+    public Game() {
+        player = new Player(0, 0, 0);
+        checkpointManager = new CheckpointManager();
+    }
+
+    public void printInfo() {
+        System.out.println("Player position: (" + player.getX() + "," + player.getY() + ")");
+        System.out.println("Player score: " + player.getScore());
+        System.out.println();
+    }
+
+    public void doTurn(int dx, int dy, int score, boolean isCheckpoint) {
+        player.moveTo(player.getX() + dx, player.getY() + dy);
+        System.out.print("Player moves to (" + player.getX() + "," + player.getY() + ")");
+        if (score != 0) {
+            player.increaseScore(score);
+            System.out.print(" and gains +" + score + " score");
+        }
+        if (isCheckpoint) {
+            checkpointManager.save(player);
+            System.out.print(". It's a checkpoint and their position and score are saved");
+        }
+        System.out.println();
+        printInfo();
+    }
+
+    public void doTurn(int dx, int dy) {
+        doTurn(dx, dy, 0, false);
+    }
+
+    public void doTurn(int dx, int dy, int score) {
+        doTurn(dx, dy, score, false);
+    }
+
+    public void doTurn(int dx, int dy, boolean isCheckpoint) {
+        doTurn(dx, dy, 0, isCheckpoint);
+    }
+
+    public void die() {
+        checkpointManager.restore(player);
+        System.out.println("Player died ! Returning to previous checkpoint");
+        printInfo();
+    }
+
+    public static void main(String[] args) {
+        Game game = new Game();
+
+        game.printInfo();
+        game.doTurn(1, 1, 100);
+        game.doTurn(1, 1, true);
+        game.doTurn(4, 4, 100);
+        game.die();
+    }
+}

src/lab10_memento/ex1/Player.java

@@ -0,0 +1,68 @@
+package lab10_memento.ex1;
+
+public class Player {
+    private int x;
+    private int y;
+    private int score;
+
+    public Player(int x, int y, int score) {
+        this.x = x;
+        this.y = y;
+        this.score = score;
+    }
+
+    public void moveTo(int x, int y) {
+        this.x = x;
+        this.y = y;
+    }
+
+    public void increaseScore(int score) {
+        this.score += score;
+    }
+
+    public int getX() {
+        return x;
+    }
+
+    public int getY() {
+        return y;
+    }
+
+    public int getScore() {
+        return score;
+    }
+
+    public Checkpoint makeCheckpoint() {
+        return new Checkpoint(this);
+    }
+
+    public class Checkpoint {
+        private final int x;
+        private final int y;
+        private final int score;
+
+        public Checkpoint(Player player) {
+            x = player.getX();
+            y = player.getY();
+            score = player.getScore();
+        }
+
+        public int getX() {
+            return x;
+        }
+
+        public int getY() {
+            return y;
+        }
+
+        public int getScore() {
+            return score;
+        }
+
+        public void restore(Player player) {
+            player.x = this.getX();
+            player.y = this.getY();
+            player.score = this.getScore();
+        }
+    }
+}