diff --git a/c/native.c b/c/native.c
index 60df6cf..45aaab0 100644
--- a/c/native.c
+++ b/c/native.c
@@ -121,9 +121,15 @@ const static struct native_method native_method[] = {
   {
     .class_name = "java/lang/Class",
     .method_name = "_getName",
-    .method_descriptor = "()Ljava/lang/String;",
+    .method_descriptor = "(Ljava/lang/Object;)Ljava/lang/String;",
     .func = native_java_lang_class_getname_1,
   },
+  {
+    .class_name = "java/lang/Class",
+    .method_name = "_getSuperclass",
+    .method_descriptor = "(Ljava/lang/Object;)Ljava/lang/String;",
+    .func = native_java_lang_class_getsuperclass_1,
+  },
   {
     .class_name = "java/lang/Object",
     .method_name = "_getClass",
diff --git a/c/native/class.c b/c/native/class.c
index 75c7c26..58f995f 100644
--- a/c/native/class.c
+++ b/c/native/class.c
@@ -6,18 +6,39 @@ void native_java_lang_class_getname_1(struct vm * vm, uint32_t * args)
 {
   struct objectref * objectref = (struct objectref *)args[0];
   assert(objectref != nullptr);
-
   assert(objectref->oref[0] != nullptr);
-  assert(objectref->oref[0]->class_entry != nullptr);
-  struct class_file * class_file = objectref->oref[0]->class_entry->class_file;
 
-  struct constant * class_constant = &class_file->constant_pool[class_file->this_class - 1];
+  struct class_entry * class_entry = (struct class_entry *)objectref->oref[0];
+
+  struct constant * class_constant = &class_entry->class_file->constant_pool[class_entry->class_file->this_class - 1];
   assert(class_constant->tag == CONSTANT_Class);
 
-  struct constant * class_name_constant = &class_file->constant_pool[class_constant->class.name_index - 1];
+  struct constant * class_name_constant = &class_entry->class_file->constant_pool[class_constant->class.name_index - 1];
   assert(class_name_constant->tag == CONSTANT_Utf8);
 
   struct objectref * string_objectref = vm_instance_string_from_constant(vm, class_name_constant);
 
   operand_stack_push_ref(vm->current_frame, string_objectref);
 }
+
+void native_java_lang_class_getsuperclass_1(struct vm * vm, uint32_t * args)
+{
+  struct objectref * objectref = (struct objectref *)args[0];
+  assert(objectref != nullptr);
+  assert(objectref->oref[0] != nullptr);
+
+  struct class_entry * class_entry = (struct class_entry *)objectref->oref[0];
+
+  struct class_entry * super_class_entry = class_resolver_lookup_class_from_class_index(vm->class_hash_table.length,
+                                                                                        vm->class_hash_table.entry,
+                                                                                        class_entry,
+                                                                                        class_entry->class_file->super_class);
+
+  struct objectref * class_objectref = vm_instance_create(vm, "java/lang/Class");
+  assert(class_objectref != nullptr);
+  assert(class_objectref->class_entry->instance_fields_count >= 1);
+
+  class_objectref->oref[0] = (struct objectref *)super_class_entry;
+
+  operand_stack_push_ref(vm->current_frame, class_objectref);
+}
diff --git a/c/native/class.h b/c/native/class.h
index 0c7a33c..8f98d37 100644
--- a/c/native/class.h
+++ b/c/native/class.h
@@ -5,3 +5,4 @@
 #include "frame.h"
 
 void native_java_lang_class_getname_1(struct vm * vm, uint32_t * args);
+void native_java_lang_class_getsuperclass_1(struct vm * vm, uint32_t * args);
diff --git a/c/native/object.c b/c/native/object.c
index 8e7c3d6..0d34cb8 100644
--- a/c/native/object.c
+++ b/c/native/object.c
@@ -10,7 +10,7 @@ void native_java_lang_object_getclass_1(struct vm * vm, uint32_t * args)
   assert(class_objectref != nullptr);
   assert(class_objectref->class_entry->instance_fields_count >= 1);
 
-  class_objectref->oref[0] = objectref;
+  class_objectref->oref[0] = (struct objectref *)objectref->class_entry;
 
   operand_stack_push_ref(vm->current_frame, class_objectref);
 }
diff --git a/classes/java/lang/Class.java b/classes/java/lang/Class.java
index 5fd5f89..80245bc 100644
--- a/classes/java/lang/Class.java
+++ b/classes/java/lang/Class.java
@@ -1,18 +1,24 @@
 package java.lang;
 
 public final class Class<T> {
-    private Object object;
+    private Object klass; // struct class_entry *
     private String name;
 
     private Class() {
     }
 
-    private native String _getName();
+    private static native String _getName(Object o);
 
     public String getName() {
         if (this.name == null) {
-            this.name = _getName();
+            this.name = _getName(this);
         }
         return this.name;
     }
+
+    private static native Class<?> _getSuperclass(Class<?> c);
+
+    public Class<? super T> getSuperclass() {
+        return (Class<? super T>)(_getSuperclass(this));
+    }
 }
diff --git a/classes/java/lang/Enum.java b/classes/java/lang/Enum.java
new file mode 100644
index 0000000..7cdee91
--- /dev/null
+++ b/classes/java/lang/Enum.java
@@ -0,0 +1,58 @@
+package java.lang;
+
+public abstract class Enum<E extends Enum<E>>
+    implements Comparable<E> {
+
+    final String name;
+
+    final int ordinal;
+
+    protected Enum(String name,
+                   int ordinal) {
+        this.name = name;
+        this.ordinal = ordinal;
+    }
+
+    protected final Object clone()
+        throws CloneNotSupportedException {
+        throw new CloneNotSupportedException();
+    }
+
+    public final int compareTo(E o) {
+        if (getDeclaringClass() != o.getDeclaringClass())
+            throw new ClassCastException();
+        return ordinal - o.ordinal;
+    }
+
+    public final boolean equals(Object other) {
+        return this == other;
+    }
+
+    public final Class<E> getDeclaringClass() {
+        Class c = getClass();
+        if (c.getSuperclass() != Enum.class)
+            c = c.getSuperclass();
+        return c;
+    }
+
+    public final int hashCode() {
+        return ordinal;
+    }
+
+    public final String name() {
+        return name;
+    }
+
+    public final int ordinal() {
+        return ordinal;
+    }
+
+    public String toString() {
+        return name;
+    }
+
+    public static <T extends Enum<T>> T valueOf(Class<T> enumType,
+                                                String name) {
+        return null;
+    }
+}
diff --git a/classes/test/TestEnum.java b/classes/test/TestEnum.java
new file mode 100644
index 0000000..184a2dc
--- /dev/null
+++ b/classes/test/TestEnum.java
@@ -0,0 +1,15 @@
+package test;
+
+public class TestEnum {
+    enum Level {
+        LOW,
+        MEDIUM,
+        HIGH
+    }
+
+    public static void main() {
+        System.out.println(args.length);
+        Level level = Level.MEDIUM;
+        System.out.println(level);
+    }
+}