diff --git a/app/src/main/java/com/gdgcatania/kotlinbootcamp/City.kt b/app/src/main/java/com/gdgcatania/kotlinbootcamp/City.kt
new file mode 100644
index 0000000..8214a07
--- /dev/null
+++ b/app/src/main/java/com/gdgcatania/kotlinbootcamp/City.kt
@@ -0,0 +1,11 @@
+package com.gdgcatania.kotlinbootcamp
+
+/**
+ * Created by AntoninoMarco on 19/11/2017.
+ */
+
+class City constructor(id : Long = 0, val name : String, val coordinate: Coordinate)
+
+class Coordinate constructor(val longitude : Float, val latitude : Float) {
+    fun isNorthEmisphere(latitude : Float) = latitude >= 0
+}
\ No newline at end of file
diff --git a/app/src/main/java/com/gdgcatania/kotlinbootcamp/Weather.kt b/app/src/main/java/com/gdgcatania/kotlinbootcamp/Weather.kt
new file mode 100644
index 0000000..188513f
--- /dev/null
+++ b/app/src/main/java/com/gdgcatania/kotlinbootcamp/Weather.kt
@@ -0,0 +1,19 @@
+package com.gdgcatania.kotlinbootcamp
+
+/**
+ * Created by AntoninoMarco on 19/11/2017.
+ */
+
+class Weather constructor(id : Int, main : String, description : String, icon : String)
+
+class Main constructor(temp : Float, pressure : Integer, temp_min : Float, temp_max : Float, sea_level : Integer, grnd_level : Integer)
+
+class Wind constructor(speed : Float, deg : Float)
+
+class Clouds constructor(all : Integer)
+
+class Rain constructor(lastThreeHours : Integer)
+
+class Snow constructor(lastThreeHours : Integer)
+
+class Sys constructor(type : Integer, id : Integer, message : Integer, country  : String, sunrire : Long, sunset :Long)
\ No newline at end of file