diff --git a/src/main/java/nl/sander/beejava/Compiler.java b/src/main/java/nl/sander/beejava/Compiler.java
index d86ae33..e755772 100644
--- a/src/main/java/nl/sander/beejava/Compiler.java
+++ b/src/main/java/nl/sander/beejava/Compiler.java
@@ -1,5 +1,6 @@
 package nl.sander.beejava;
 
+import nl.sander.beejava.api.BeeClass;
 import nl.sander.beejava.constantpool.ConstantPool;
 import nl.sander.beejava.constantpool.entry.ConstantPoolEntry;
 import nl.sander.beejava.util.ByteBuf;
diff --git a/src/main/java/nl/sander/beejava/ConstantTreeCreator.java b/src/main/java/nl/sander/beejava/ConstantTreeCreator.java
index 32e88f5..e5ac480 100644
--- a/src/main/java/nl/sander/beejava/ConstantTreeCreator.java
+++ b/src/main/java/nl/sander/beejava/ConstantTreeCreator.java
@@ -1,5 +1,8 @@
 package nl.sander.beejava;
 
+import nl.sander.beejava.api.BeeClass;
+import nl.sander.beejava.api.CodeLine;
+import nl.sander.beejava.api.Ref;
 import nl.sander.beejava.constantpool.entry.*;
 
 import java.util.LinkedHashSet;
@@ -18,6 +21,13 @@ public class ConstantTreeCreator {
     private final Set<ConstantPoolEntry> constantTree = new LinkedHashSet<>();
     private BeeClass beeClass;
 
+    /**
+     * Creates a Set of nested entries that make up a single reference. For instance a class reference whose name is a utf8 reference.
+     * In the constant pool they are consecutive entries, but they are created like nodes in a tree structure that models their relation.
+     *
+     * @param beeClass the Class object for which the constant pool needs to be created
+     * @return a Set of constant pool entries
+     */
     public Set<ConstantPoolEntry> createConstantTree(BeeClass beeClass) {
         constantTree.clear();
         this.beeClass = beeClass;
@@ -31,22 +41,24 @@ public class ConstantTreeCreator {
         codeContainer.getCode().forEach(this::updateConstantTree);
     }
 
-    // TODO construct multi root tree
+    /*
+     * scan code line for items that need adding to the constant pool
+     */
     private void updateConstantTree(CodeLine codeline) {
         if (codeline.hasMethod()){
-            addMethodRef(codeline);
+            addMethod(codeline);
         }
 
         if (codeline.hasField()) {
-            addFieldRef(codeline);
+            addField(codeline);
         }
     }
 
-    private void addMethodRef(CodeLine codeline) {
+    private void addMethod(CodeLine codeline) {
         constantTree.add(new MethodRefEntry(createClassName(codeline), createMethodNameAndType(codeline)));
     }
 
-    private void addFieldRef(CodeLine codeline) {
+    private void addField(CodeLine codeline) {
         constantTree.add(new FieldRefEntry(createClassName(codeline), createFieldNameAndType(codeline)));
     }
 
@@ -66,7 +78,7 @@ public class ConstantTreeCreator {
         if (codeline.getRef() == Ref.SUPER) {
             return beeClass.getSuperClass().getName();
         } else if (codeline.getRef() == Ref.THIS) {
-            return beeClass.getPackage() + "." + beeClass.getName();
+            return beeClass.getName();
         }
         throw new RuntimeException("shouldn't be here");
     }
diff --git a/src/main/java/nl/sander/beejava/ContainsCode.java b/src/main/java/nl/sander/beejava/ContainsCode.java
index fc762fe..97d4043 100644
--- a/src/main/java/nl/sander/beejava/ContainsCode.java
+++ b/src/main/java/nl/sander/beejava/ContainsCode.java
@@ -1,5 +1,7 @@
 package nl.sander.beejava;
 
+import nl.sander.beejava.api.CodeLine;
+
 import java.util.List;
 
 public interface ContainsCode {
diff --git a/src/main/java/nl/sander/beejava/Output.java b/src/main/java/nl/sander/beejava/Output.java
deleted file mode 100644
index 34c7660..0000000
--- a/src/main/java/nl/sander/beejava/Output.java
+++ /dev/null
@@ -1,22 +0,0 @@
-package nl.sander.beejava;
-
-/**
- * Only used to contain void return
- */
-public final class Output {
-
-    public static final Output VOID =new Output();
-
-    private Output() {
-    }
-
-    @Override
-    public int hashCode() {
-        return getClass().hashCode();
-    }
-
-    @Override
-    public boolean equals(Object obj) {
-        return getClass() == obj.getClass();
-    }
-}
diff --git a/src/main/java/nl/sander/beejava/BeeClass.java b/src/main/java/nl/sander/beejava/api/BeeClass.java
similarity index 81%
rename from src/main/java/nl/sander/beejava/BeeClass.java
rename to src/main/java/nl/sander/beejava/api/BeeClass.java
index e85f332..9c9212b 100644
--- a/src/main/java/nl/sander/beejava/BeeClass.java
+++ b/src/main/java/nl/sander/beejava/api/BeeClass.java
@@ -1,4 +1,4 @@
-package nl.sander.beejava;
+package nl.sander.beejava.api;
 
 import nl.sander.beejava.flags.ClassAccessFlag;
 
@@ -10,19 +10,19 @@ public class BeeClass {
     private final Version classFileVersion;
     private final BeePackage beePackage;
     private final Set<ClassAccessFlag> accessFlags = new HashSet<>();
-    private final String name;
+    private final String simpleName;
     private final Class<?> superClass;
     private final Set<Class<?>> interfaces = new HashSet<>();
     private final Set<BeeField> fields = new HashSet<>();
     private final Set<BeeConstructor> constructors = new HashSet<>();
 
     private BeeClass(Version classFileVersion,
-                     BeePackage beePackage, Set<ClassAccessFlag> accessFlags, String name, Class<?> superClass,
+                     BeePackage beePackage, Set<ClassAccessFlag> accessFlags, String simpleName, Class<?> superClass,
                      Set<Class<?>> interfaces, Set<BeeField> fields, Set<BeeConstructor> constructors) {
         this.classFileVersion = classFileVersion;
         this.beePackage = beePackage;
         this.accessFlags.addAll(accessFlags);
-        this.name = name;
+        this.simpleName = simpleName;
         this.superClass = superClass;
         this.interfaces.addAll(interfaces);
         this.fields.addAll(fields);
@@ -41,8 +41,11 @@ public class BeeClass {
         return beePackage;
     }
 
-    public String getName() {
-        return name;
+    /**
+     * returns the unqualified name, like java.lang.Class
+     */
+    public String getSimpleName() {
+        return simpleName;
     }
 
     public Set<BeeConstructor> getConstructors() {
@@ -53,6 +56,13 @@ public class BeeClass {
         return accessFlags;
     }
 
+    /**
+     * returns the full name, like java.lang.Class
+     */
+    public String getName() {
+        return beePackage.getName() + "." + simpleName;
+    }
+
     public Class<?> getSuperClass() {
         return superClass;
     }
@@ -62,20 +72,20 @@ public class BeeClass {
     }
 
     public static class Builder {
-        private Version version;
         private final Set<ClassAccessFlag> accessFlags = new HashSet<>();
         private final Set<Class<?>> interfaces = new HashSet<>();
         private final Set<BeeField> fields = new HashSet<>();
         private final Set<BeeConstructor> constructors = new HashSet<>();
+        private Version version;
         private BeePackage beePackage;
         private Class<?> superClass = Object.class;
-        private String name;
+        private String simpleName;
 
         private Builder() {
         }
 
-        public Builder withClassFileVersion(Version version){
-            this.version=version;
+        public Builder withClassFileVersion(Version version) {
+            this.version = version;
             return this;
         }
 
@@ -89,8 +99,8 @@ public class BeeClass {
             return this;
         }
 
-        public BeeClass.Builder withName(String name) {
-            this.name = name;
+        public BeeClass.Builder withSimpleName(String simpleName) {
+            this.simpleName = simpleName;
             return this;
         }
 
@@ -115,7 +125,7 @@ public class BeeClass {
         }
 
         public BeeClass build() {
-            return new BeeClass(version, beePackage, accessFlags, name, superClass, interfaces, fields, constructors);
+            return new BeeClass(version, beePackage, accessFlags, simpleName, superClass, interfaces, fields, constructors);
         }
 
 
diff --git a/src/main/java/nl/sander/beejava/BeeConstructor.java b/src/main/java/nl/sander/beejava/api/BeeConstructor.java
similarity index 93%
rename from src/main/java/nl/sander/beejava/BeeConstructor.java
rename to src/main/java/nl/sander/beejava/api/BeeConstructor.java
index a5243e5..f5d7643 100644
--- a/src/main/java/nl/sander/beejava/BeeConstructor.java
+++ b/src/main/java/nl/sander/beejava/api/BeeConstructor.java
@@ -1,10 +1,14 @@
-package nl.sander.beejava;
+package nl.sander.beejava.api;
 
+import nl.sander.beejava.ContainsCode;
 import nl.sander.beejava.flags.MethodAccessFlag;
 
 import java.util.*;
 
-public class BeeConstructor implements ContainsCode{
+/**
+ * Models a constructor
+ */
+public class BeeConstructor implements ContainsCode {
     private final Set<MethodAccessFlag> accessFlags = new HashSet<>();
     private final Set<BeeParameter> formalParameters = new HashSet<>();
     private final List<CodeLine> code = new LinkedList<>();
diff --git a/src/main/java/nl/sander/beejava/BeeField.java b/src/main/java/nl/sander/beejava/api/BeeField.java
similarity index 98%
rename from src/main/java/nl/sander/beejava/BeeField.java
rename to src/main/java/nl/sander/beejava/api/BeeField.java
index 138fb64..1f40c91 100644
--- a/src/main/java/nl/sander/beejava/BeeField.java
+++ b/src/main/java/nl/sander/beejava/api/BeeField.java
@@ -1,4 +1,4 @@
-package nl.sander.beejava;
+package nl.sander.beejava.api;
 
 import nl.sander.beejava.flags.FieldAccessFlag;
 
diff --git a/src/main/java/nl/sander/beejava/BeePackage.java b/src/main/java/nl/sander/beejava/api/BeePackage.java
similarity index 56%
rename from src/main/java/nl/sander/beejava/BeePackage.java
rename to src/main/java/nl/sander/beejava/api/BeePackage.java
index 1d655ed..9b0f997 100644
--- a/src/main/java/nl/sander/beejava/BeePackage.java
+++ b/src/main/java/nl/sander/beejava/api/BeePackage.java
@@ -1,4 +1,4 @@
-package nl.sander.beejava;
+package nl.sander.beejava.api;
 
 class BeePackage {
 
@@ -7,4 +7,8 @@ class BeePackage {
     BeePackage(String name) {
         this.name = name;
     }
+
+    public String getName() {
+        return name;
+    }
 }
diff --git a/src/main/java/nl/sander/beejava/BeeParameter.java b/src/main/java/nl/sander/beejava/api/BeeParameter.java
similarity index 89%
rename from src/main/java/nl/sander/beejava/BeeParameter.java
rename to src/main/java/nl/sander/beejava/api/BeeParameter.java
index 60c3604..7a46697 100644
--- a/src/main/java/nl/sander/beejava/BeeParameter.java
+++ b/src/main/java/nl/sander/beejava/api/BeeParameter.java
@@ -1,7 +1,10 @@
-package nl.sander.beejava;
+package nl.sander.beejava.api;
 
 import java.util.Objects;
 
+/**
+ * Models a formal parameter in a method declaration.
+ */
 public class BeeParameter {
     private final Class<?> type;
     private final String name;
diff --git a/src/main/java/nl/sander/beejava/CodeLine.java b/src/main/java/nl/sander/beejava/api/CodeLine.java
similarity index 90%
rename from src/main/java/nl/sander/beejava/CodeLine.java
rename to src/main/java/nl/sander/beejava/api/CodeLine.java
index a0bbb5d..a8c67a8 100644
--- a/src/main/java/nl/sander/beejava/CodeLine.java
+++ b/src/main/java/nl/sander/beejava/api/CodeLine.java
@@ -1,7 +1,7 @@
-package nl.sander.beejava;
+package nl.sander.beejava.api;
 
 
-class CodeLine {
+public class CodeLine {
     private final int linenumber;
     private final Opcode opcode;
     private Ref ref;
@@ -78,28 +78,27 @@ class CodeLine {
         return methodName;
     }
 
-    boolean hasMethod() {
+    public boolean hasMethod() {
         return methodName != null;
     }
 
-    String getMethodSignature() {
+    public String getMethodSignature() {
         return inputSignature + outputSignature;
     }
 
-    Ref getRef() {
+    public Ref getRef() {
         return ref;
     }
 
-
-    boolean hasField() {
+    public boolean hasField() {
         return field != null;
     }
 
-    BeeField getField() {
+    public BeeField getField() {
         return field;
     }
 
-    BeeParameter getParameter() {
+    public BeeParameter getParameter() {
         return parameter;
     }
 
diff --git a/src/main/java/nl/sander/beejava/Opcode.java b/src/main/java/nl/sander/beejava/api/Opcode.java
similarity index 97%
rename from src/main/java/nl/sander/beejava/Opcode.java
rename to src/main/java/nl/sander/beejava/api/Opcode.java
index 263386b..f0eaa61 100644
--- a/src/main/java/nl/sander/beejava/Opcode.java
+++ b/src/main/java/nl/sander/beejava/api/Opcode.java
@@ -1,4 +1,4 @@
-package nl.sander.beejava;
+package nl.sander.beejava.api;
 
 public enum Opcode {
     LOAD("load"),
diff --git a/src/main/java/nl/sander/beejava/Ref.java b/src/main/java/nl/sander/beejava/api/Ref.java
similarity index 70%
rename from src/main/java/nl/sander/beejava/Ref.java
rename to src/main/java/nl/sander/beejava/api/Ref.java
index ac972f1..49ea11a 100644
--- a/src/main/java/nl/sander/beejava/Ref.java
+++ b/src/main/java/nl/sander/beejava/api/Ref.java
@@ -1,10 +1,9 @@
-package nl.sander.beejava;
+package nl.sander.beejava.api;
 
 /**
  * used to indicate this, super, or none of those, in which case it's class
  */
 public enum Ref {
     THIS,
-    SUPER,
-    CLASS
+    SUPER
 }
diff --git a/src/main/java/nl/sander/beejava/Version.java b/src/main/java/nl/sander/beejava/api/Version.java
similarity index 93%
rename from src/main/java/nl/sander/beejava/Version.java
rename to src/main/java/nl/sander/beejava/api/Version.java
index 81ae9b0..36d5396 100644
--- a/src/main/java/nl/sander/beejava/Version.java
+++ b/src/main/java/nl/sander/beejava/api/Version.java
@@ -1,4 +1,4 @@
-package nl.sander.beejava;
+package nl.sander.beejava.api;
 
 public enum Version {
     V1_0_2(45),
diff --git a/src/main/java/nl/sander/beejava/flags/AccessFlag.java b/src/main/java/nl/sander/beejava/flags/AccessFlag.java
index 75b905e..f72a126 100644
--- a/src/main/java/nl/sander/beejava/flags/AccessFlag.java
+++ b/src/main/java/nl/sander/beejava/flags/AccessFlag.java
@@ -2,6 +2,7 @@ package nl.sander.beejava.flags;
 
 import java.util.Set;
 
+// TODO all access flags can be moved together
 public interface AccessFlag {
 
     int getBytecode();
diff --git a/src/test/java/nl/sander/beejava/ConstantTeeTests.java b/src/test/java/nl/sander/beejava/ConstantTreeCreatorTests.java
similarity index 87%
rename from src/test/java/nl/sander/beejava/ConstantTeeTests.java
rename to src/test/java/nl/sander/beejava/ConstantTreeCreatorTests.java
index afbd4f9..b67ceb1 100644
--- a/src/test/java/nl/sander/beejava/ConstantTeeTests.java
+++ b/src/test/java/nl/sander/beejava/ConstantTreeCreatorTests.java
@@ -1,5 +1,6 @@
 package nl.sander.beejava;
 
+import nl.sander.beejava.api.*;
 import nl.sander.beejava.constantpool.entry.*;
 import nl.sander.beejava.flags.FieldAccessFlag;
 import nl.sander.beejava.flags.MethodAccessFlag;
@@ -8,13 +9,15 @@ import org.junit.jupiter.api.Test;
 import java.util.Iterator;
 import java.util.Set;
 
-import static nl.sander.beejava.CodeLine.line;
-import static nl.sander.beejava.Opcode.*;
+import static nl.sander.beejava.api.CodeLine.line;
+import static nl.sander.beejava.api.Opcode.*;
 import static nl.sander.beejava.flags.ClassAccessFlag.PUBLIC;
 import static org.junit.jupiter.api.Assertions.assertEquals;
 
-public class ConstantTeeTests {
-    @Test
+public class ConstantTreeCreatorTests {
+
+    // creates simplest class possible and checks the tree, that the ConstantTreeCreator emits
+    @Test // This is not a maintainable test
     public void testMethodRefEntryForSuperConstructor() {
         BeeClass classWithIntField = createEmptyClass();
         Set<ConstantPoolEntry> constantTree = new ConstantTreeCreator().createConstantTree(classWithIntField);
@@ -72,9 +75,9 @@ public class ConstantTeeTests {
                 .withClassFileVersion(Version.V14)
                 .withPackage("nl.sander.beejava.test")
                 .withAccessFlags(PUBLIC)
-                .withName("EmptyBean")
-                .withSuperClass(Object.class)
-                .withConstructors(constructor)
+                .withSimpleName("EmptyBean")
+                .withSuperClass(Object.class) // Not mandatory, like in java sourcecode
+                .withConstructors(constructor) // There's no default constructor in beejava. The user must always add them
                 .build();
     }
 
@@ -103,7 +106,7 @@ public class ConstantTeeTests {
                 .withClassFileVersion(Version.V14)
                 .withPackage("nl.sander.beejava.test")
                 .withAccessFlags(PUBLIC)
-                .withName("IntBean")
+                .withSimpleName("IntBean")
                 .withSuperClass(Object.class)
                 .withFields(intField)
                 .withConstructors(constructor)