Added helper methods

src/main/java/dev/unlegitdqrk/unlegitlibrary/network/system/packets/Packet.java

@@ -9,6 +9,8 @@
 package dev.unlegitdqrk.unlegitlibrary.network.system.packets;
 
 import java.io.*;
+import java.util.List;
+import java.util.Map;
 import java.util.UUID;
 
 public abstract class Packet {
@@ -19,5 +21,55 @@ public abstract class Packet {
     public abstract void read(DataInputStream stream, UUID clientID) throws IOException;
     public abstract void write(DataOutputStream stream) throws IOException;
 
+
+    public final void writeList(DataOutputStream stream, List<?> list) throws IOException {
+        stream.writeInt(list.size());
+        for (Object item : list) {
+            writeObject(stream, item);
+        }
+    }
+
+    public final List<?> readList(DataInputStream stream) throws IOException {
+        int size = stream.readInt();
+        java.util.ArrayList<Object> list = new java.util.ArrayList<>(Math.max(size, 0));
+        for (int i = 0; i < size; i++) {
+            list.add(readObject(stream));
+        }
+        return list;
+    }
+
+    public final void writeMap(DataOutputStream stream, Map<?, ?> map) throws IOException {
+        stream.writeInt(map.size());
+        for (Map.Entry<?, ?> entry : map.entrySet()) {
+            writeObject(stream, entry.getKey());
+            writeObject(stream, entry.getValue());
+        }
+    }
+
+    public final Map<?, ?> readMap(DataInputStream stream) throws IOException {
+        int size = stream.readInt();
+        java.util.HashMap<Object, Object> map = new java.util.HashMap<>(Math.max(size * 2, 0));
+        for (int i = 0; i < size; i++) {
+            Object key = readObject(stream);
+            Object value = readObject(stream);
+            map.put(key, value);
+        }
+        return map;
+    }
+
+    public final void writeObject(DataOutputStream stream, Object object) throws IOException {
+        ObjectOutputStream oos = new ObjectOutputStream(stream);
+        oos.writeObject(object);
+        oos.flush();
+    }
+
+    public final Object readObject(DataInputStream stream) throws IOException {
+        ObjectInputStream ois = new ObjectInputStream(stream);
+        try {
+            return ois.readObject();
+        } catch (ClassNotFoundException e) {
+            throw new IOException("Failed to deserialize object", e);
+        }
+    }
 }