continued inventory saving (missing things will be created in an issue asap)

src/de/miaurizius/jgame2d/data/Config.java

@@ -0,0 +1,88 @@
+package de.miaurizius.jgame2d.data;
+
+import de.miaurizius.jgame2d.core.GamePanel;
+
+import java.io.*;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+public class Config {
+
+    private final GamePanel panel;
+    private final HashMap<String, String> settings = new HashMap<>();
+
+    public Config(GamePanel panel) throws IOException {
+        this.panel = panel;
+        for (Setting option : Setting.values()) settings.put(option.name, null);
+        new File("gamedata").mkdirs();
+        new File("gamedata/save").mkdirs();
+        new File("gamedata/config").createNewFile();
+    }
+
+    // GENERAL
+    public final void save() {
+        try {
+            insertToHash();
+            BufferedWriter writer = new BufferedWriter(new FileWriter("gamedata/config"));
+            settings.forEach((invoke, value) -> {
+                try {
+                    writer.write(invoke + ": " + value);
+                    writer.newLine();
+                } catch (IOException e) {
+                    throw new RuntimeException(e);
+                }
+            });
+            writer.close();
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
+    }
+    public final void load() {
+        try (BufferedReader reader = new BufferedReader(new FileReader("gamedata/config"))) {
+            List<String> lines = reader.lines().toList();
+            if (lines.isEmpty()) return;
+            Map<String, String> configMap = new HashMap<>();
+            for (String line : lines) {
+                String[] parts = line.split(":\\s*", 2);
+                if (parts.length == 2) {
+                    configMap.put(parts[0].trim(), parts[1].trim());
+                }
+            }
+
+            for (Setting setting : Setting.values()) {
+                String value = configMap.get(setting.name);
+                if (value != null) {
+                    switch (setting) {
+                        case FULLSCREEN -> panel.fullscreen = Boolean.parseBoolean(value);
+                        case MUSICVOLUME -> panel.music.volumeScale = Integer.parseInt(value);
+                        case SFXVOLUME -> panel.sfx.volumeScale = Integer.parseInt(value);
+                    }
+                }
+            }
+            insertToHash();
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    // HELP FUNCTIONS
+    private void insertToHash() {
+        settings.put(Setting.FULLSCREEN.name, String.valueOf(panel.fullscreen));
+        settings.put(Setting.MUSICVOLUME.name, String.valueOf(panel.music.volumeScale));
+        settings.put(Setting.SFXVOLUME.name, String.valueOf(panel.sfx.volumeScale));
+    }
+
+    private enum Setting {
+        FULLSCREEN("fullscreen"),
+        MUSICVOLUME("music-vol"),
+        SFXVOLUME("sfx-vol");
+
+        private final String name;
+
+        Setting(String name) {
+            this.name = name;
+        }
+    }
+
+}

src/de/miaurizius/jgame2d/data/DataStorage.java

@@ -0,0 +1,28 @@
+package de.miaurizius.jgame2d.data;
+
+import java.io.Serializable;
+import java.util.ArrayList;
+import java.util.List;
+
+public class DataStorage implements Serializable {
+
+    // PLAYER STATS
+    int level;
+    int maxLife;
+    int life;
+    int maxMana;
+    int strength;
+    int dexterity;
+    int attack;
+    int defense;
+    int exp;
+    int nextLevelExp;
+    int coins;
+    int worldX, worldY;
+
+    // PLAYER INVENTORY
+    List<String> itemNames = new ArrayList<>();
+    List<Integer> itemAmounts = new ArrayList<>();
+
+
+}

src/de/miaurizius/jgame2d/data/SaveLoad.java

@@ -0,0 +1,82 @@
+package de.miaurizius.jgame2d.data;
+
+import de.miaurizius.jgame2d.core.GamePanel;
+import de.miaurizius.jgame2d.entity.Entity;
+
+import java.io.*;
+import java.lang.reflect.InvocationTargetException;
+
+public class SaveLoad {
+
+    GamePanel panel;
+
+    public SaveLoad(GamePanel panel) {
+        this.panel = panel;
+    }
+
+    public Entity getObject(String itemName) {
+        Entity obj;
+        try {
+            obj = (Entity) Class.forName(itemName).getDeclaredConstructor().newInstance(panel);
+        } catch (ClassNotFoundException | NoSuchMethodException | InstantiationException | IllegalAccessException |
+                 InvocationTargetException e) {
+            throw new RuntimeException(e);
+        }
+        return obj;
+    }
+
+    public void save() throws IOException {
+        ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream("gamedata/save/savegame.dat"));
+        DataStorage ds = new DataStorage();
+
+        // PLAYER STATS
+        ds.level = panel.player.level;
+        ds.maxLife = panel.player.maxLife;
+        ds.life = panel.player.life;
+        ds.maxMana = panel.player.maxMana;
+        ds.strength = panel.player.strength;
+        ds.dexterity = panel.player.dexterity;
+        ds.attack = panel.player.attack;
+        ds.defense = panel.player.defense;
+        ds.exp = panel.player.exp;
+        ds.nextLevelExp = panel.player.nextLevelExp;
+        ds.coins = panel.player.coins;
+        ds.worldX = panel.player.worldX;
+        ds.worldY = panel.player.worldY;
+
+        // PLAYER INVENTORY
+        for(int i = 0; i < panel.player.inventory.size(); i++) {
+            ds.itemNames.add(panel.player.inventory.get(i).getClass().getName());
+            ds.itemAmounts.add(panel.player.inventory.get(i).amt);
+        }
+
+        // WRITE
+        oos.writeObject(ds);
+    }
+
+    public void load() throws ClassNotFoundException, IOException {
+        ObjectInputStream ois = new ObjectInputStream(new FileInputStream("gamedata/save/savegame.dat"));
+        DataStorage ds = (DataStorage) ois.readObject();
+
+        panel.player.level = ds.level;
+        panel.player.maxLife = ds.maxLife;
+        panel.player.life = ds.life;
+        panel.player.maxMana = ds.maxMana;
+        panel.player.strength = ds.strength;
+        panel.player.dexterity = ds.dexterity;
+        panel.player.attack = ds.attack;
+        panel.player.defense = ds.defense;
+        panel.player.exp = ds.exp;
+        panel.player.nextLevelExp = ds.nextLevelExp;
+        panel.player.coins = ds.coins;
+        panel.player.worldX = ds.worldX;
+        panel.player.worldY = ds.worldY;
+
+        for(int i = 0; i < ds.itemNames.size(); i++) {
+            Entity obj = getObject(ds.itemNames.get(i));
+            obj.amt = ds.itemAmounts.get(i);
+            panel.player.inventory.add(obj);
+        }
+    }
+
+}