diff --git a/bin/Archiv/Yoda.class b/bin/Archiv/Yoda.class
index 8361981..710eb51 100644
Binary files a/bin/Archiv/Yoda.class and b/bin/Archiv/Yoda.class differ
diff --git a/bin/Grundlagen.class b/bin/Grundlagen.class
index 4b4e32b..4d2d259 100644
Binary files a/bin/Grundlagen.class and b/bin/Grundlagen.class differ
diff --git a/bin/Testcode.class b/bin/Testcode.class
index 1c6df81..d0a81bd 100644
Binary files a/bin/Testcode.class and b/bin/Testcode.class differ
diff --git a/src/Archiv/Yoda.java b/src/Archiv/Yoda.java
index dd7164d..847cebd 100644
--- a/src/Archiv/Yoda.java
+++ b/src/Archiv/Yoda.java
@@ -1,3 +1,5 @@
+package Archiv;
+
 import java.util.Random;
 
 public class Yoda {
diff --git a/src/Grundlagen.java b/src/Grundlagen.java
index dbcf7b4..159765c 100644
--- a/src/Grundlagen.java
+++ b/src/Grundlagen.java
@@ -28,5 +28,18 @@ public class Grundlagen {
             System.out.println("Durchgang nr. " + anzahlDurchgaenge);
             anzahlDurchgaenge = anzahlDurchgaenge + 1;
         }
+
+        // Datentypen
+        byte myByte = 127;
+        short myShort = 300;
+
+        // With float the f is necassary because java otherwise treats it as a double
+        // (simplified anwser)
+        double myDoubleValue = 34.568956;
+        float myFloatValue = 17.567f;
+
+        // Constant always uppercase // Fixed Number
+
+        final double PI = 3.141592876;
     }
 }
\ No newline at end of file
diff --git a/src/Testcode.java b/src/Testcode.java
index 2526e93..7a532fb 100644
--- a/src/Testcode.java
+++ b/src/Testcode.java
@@ -1,12 +1,5 @@
 public class Testcode {
     public static void main(String[] args) {
 
-        int a = 1, b = 2, c = 3, d = 4, e = 5, f = 6, g = 7, h = 8;
-        int sum = a + b + c + d + e + f + g + h;
-
-        System.out.println(sum);
-        byte x = 127;
-        System.out.println(x);
-
     }
 }