save game settings and parse them

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

@@ -0,0 +1,65 @@
+package de.miaurizius.jgame2d.core;
+
+import java.io.*;
+import java.util.HashMap;
+import java.util.List;
+
+public class Config {
+
+    private final GamePanel panel;
+    private final HashMap<String, String> settings = new HashMap<>();
+    private final String[] options = new String[]{
+            "fullscreen",       //0
+            "music-vol",        //1
+            "sfx-vol"           //2
+    };
+
+    public Config(GamePanel panel) {
+        this.panel = panel;
+        for (String option : options) settings.put(option, null);
+    }
+
+    //
+    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; //No config found, use default values
+            for (int i = 0; i < options.length; i++) {
+                String value = lines.get(i).split(": ")[1];
+                switch (options[i]) {
+                    case "fullscreen" -> panel.fullscreen = Boolean.parseBoolean(value);
+                    case "music-vol" -> panel.music.volumeScale = Integer.parseInt(value);
+                    case "sfx-vol" -> panel.sfx.volumeScale = Integer.parseInt(value);
+                }
+            }
+            insertToHash();
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    // HELP FUNCTIONS
+    private void insertToHash() {
+        settings.put(options[0], String.valueOf(panel.fullscreen));
+        settings.put(options[1], String.valueOf(panel.music.volumeScale));
+        settings.put(options[2], String.valueOf(panel.sfx.volumeScale));
+    }
+}