diff --git a/chat/src/main/java/rtgre/modeles/Room.java b/chat/src/main/java/rtgre/modeles/Room.java
new file mode 100644
index 0000000..ba96c72
--- /dev/null
+++ b/chat/src/main/java/rtgre/modeles/Room.java
@@ -0,0 +1,59 @@
+package rtgre.modeles;
+
+import org.json.JSONObject;
+
+import java.util.HashSet;
+import java.util.Objects;
+
+public class Room {
+    protected String roomName;
+    protected HashSet<String> loginSet;
+
+
+    public String getRoomName() {
+        return roomName;
+    }
+
+    public HashSet<String> getLoginSet() {
+        return loginSet;
+    }
+
+    public Room(String roomName) {
+        this.roomName = roomName;
+        this.loginSet = null;
+    }
+
+    public String abbreviation() {
+        return this.roomName.split("#")[1].substring(0, 1);
+    }
+
+    @Override
+    public String toString() {
+        return this.roomName;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        Room room = (Room) o;
+        return Objects.equals(roomName, room.roomName);
+    }
+
+    public void add(String login) {
+        if (loginSet == null) {
+            loginSet = new HashSet<>();
+        }
+        loginSet.add(login);
+    }
+
+    public JSONObject toJsonObject() {
+        return new JSONObject()
+                .put("room", this.roomName)
+                .put("loginSet", this.loginSet);
+    }
+
+    public String toJson() {
+        return this.toJsonObject().toString();
+    }
+}
diff --git a/chat/src/main/java/rtgre/modeles/RoomMap.java b/chat/src/main/java/rtgre/modeles/RoomMap.java
new file mode 100644
index 0000000..039d986
--- /dev/null
+++ b/chat/src/main/java/rtgre/modeles/RoomMap.java
@@ -0,0 +1,16 @@
+package rtgre.modeles;
+
+import java.util.TreeMap;
+
+public class RoomMap extends TreeMap<String, Room> {
+    public void add(Room room) {
+        this.put(room.roomName, room);
+    }
+
+    public void loadDefaultRooms() {
+        this.add(new Room("#all"));
+        this.add(new Room("#juniors"));
+        this.add(new Room("#ducks"));
+        this.add(new Room("#mice"));
+    }
+}