diff --git a/project.cabal b/project.cabal
index 520b172..5a98c99 100644
--- a/project.cabal
+++ b/project.cabal
@@ -16,7 +16,7 @@ executable compiler
                         src/ByteCode,
                         src/ByteCode/ClassFile
     build-tool-depends: alex:alex, happy:happy
-    other-modules:      Parser.Lexer, Ast, Parser.JavaParser, ByteCode.ByteUtil, ByteCode.ClassFile, ByteCode.ClassFile.Generator
+    other-modules:      Parser.Lexer, Ast, Parser.JavaParser, ByteCode.ByteUtil, ByteCode.ClassFile, ByteCode.ClassFile.Generator, ByteCode.Constants
 
 test-suite tests
     type:               exitcode-stdio-1.0
diff --git a/src/ByteCode/ClassFile.hs b/src/ByteCode/ClassFile.hs
index b1aa39c..8d23be2 100644
--- a/src/ByteCode/ClassFile.hs
+++ b/src/ByteCode/ClassFile.hs
@@ -1,21 +1,17 @@
-module ByteCode.ClassFile where
+module ByteCode.ClassFile(
+    ConstantInfo(..),
+    Attribute(..),
+    MemberInfo(..),
+    ClassFile(..),
+    serialize
+) where
 
 import Data.Word
 import Data.Int
 import Data.ByteString (unpack)
 import Data.ByteString.UTF8 (fromString)
 import ByteCode.ByteUtil
-
-tagClass        = 0x07
-tagFieldref     = 0x09
-tagMethodref    = 0x0A
-tagNameandtype  = 0x0C
-tagInteger      = 0x03
-tagUtf8         = 0x01
-
-accessPublic    = 0x01
-accessPrivate   = 0x02
-accessProtected = 0x04
+import ByteCode.Constants
 
 data ConstantInfo = ClassInfo Word16
                   | FieldRefInfo Word16 Word16
diff --git a/src/ByteCode/ClassFile/Generator.hs b/src/ByteCode/ClassFile/Generator.hs
index 9bcbfff..5005f9d 100644
--- a/src/ByteCode/ClassFile/Generator.hs
+++ b/src/ByteCode/ClassFile/Generator.hs
@@ -1 +1,31 @@
-module ByteCode.ClassFile.Generator where
+module ByteCode.ClassFile.Generator(
+    fromAST
+) where
+
+import ByteCode.Constants
+import ByteCode.ClassFile (ClassFile (..), ConstantInfo (..))
+import Ast
+
+
+baseConstants = [
+        ClassInfo 4,
+        MethodRefInfo 1 3,
+        NameAndTypeInfo 5 6,
+        Utf8Info "java/lang/Object",
+        Utf8Info "<init>",
+        Utf8Info "()V"
+    ]
+
+
+fromAST :: Class -> ClassFile
+fromAST (Class name methods fields) = let
+    in
+        ClassFile {
+            constantPool = baseConstants,
+            accessFlags = accessPublic,
+            thisClass = 1,
+            superClass = 1,
+            fields = [],
+            methods = [],
+            attributes = []
+        }
\ No newline at end of file
diff --git a/src/ByteCode/Constants.hs b/src/ByteCode/Constants.hs
new file mode 100644
index 0000000..28b4a9c
--- /dev/null
+++ b/src/ByteCode/Constants.hs
@@ -0,0 +1,25 @@
+module ByteCode.Constants where
+import Data.Word
+
+
+tagClass :: Word8
+tagFieldref :: Word8
+tagMethodref :: Word8
+tagNameandtype :: Word8
+tagInteger :: Word8
+tagUtf8 :: Word8
+
+accessPublic :: Word16
+accessPrivate :: Word16
+accessProtected :: Word16
+
+tagClass        = 0x07
+tagFieldref     = 0x09
+tagMethodref    = 0x0A
+tagNameandtype  = 0x0C
+tagInteger      = 0x03
+tagUtf8         = 0x01
+
+accessPublic    = 0x01
+accessPrivate   = 0x02
+accessProtected = 0x04
\ No newline at end of file