diff --git a/c/native.c b/c/native.c
index 0d1f2bf..a1374f1 100644
--- a/c/native.c
+++ b/c/native.c
@@ -118,19 +118,19 @@ const static struct native_method native_method[] = {
   },
   {
     .class_name = "java/lang/Class",
-    .method_name = "getClassName",
+    .method_name = "_getName",
     .method_descriptor = "()Ljava/lang/String;",
-    .func = native_java_lang_class_getclassname_1,
+    .func = native_java_lang_class_getname_1,
   },
   {
     .class_name = "java/lang/Object",
-    .method_name = "getClass",
+    .method_name = "_getClass",
     .method_descriptor = "()Ljava/lang/Class;",
     .func = native_java_lang_object_getclass_1,
   },
   {
     .class_name = "java/lang/Object",
-    .method_name = "hashCode",
+    .method_name = "_hashCode",
     .method_descriptor = "()I",
     .func = native_java_lang_object_hashcode_1,
   },
diff --git a/c/native/class.c b/c/native/class.c
index b634427..75c7c26 100644
--- a/c/native/class.c
+++ b/c/native/class.c
@@ -2,7 +2,7 @@
 #include "printf.h"
 #include "vm_instance.h"
 
-void native_java_lang_class_getclassname_1(struct vm * vm, uint32_t * args)
+void native_java_lang_class_getname_1(struct vm * vm, uint32_t * args)
 {
   struct objectref * objectref = (struct objectref *)args[0];
   assert(objectref != nullptr);
diff --git a/c/native/class.h b/c/native/class.h
index da6d023..0c7a33c 100644
--- a/c/native/class.h
+++ b/c/native/class.h
@@ -4,4 +4,4 @@
 
 #include "frame.h"
 
-void native_java_lang_class_getclassname_1(struct vm * vm, uint32_t * args);
+void native_java_lang_class_getname_1(struct vm * vm, uint32_t * args);
diff --git a/classes/java/lang/Class.java b/classes/java/lang/Class.java
index 83c9a86..5fd5f89 100644
--- a/classes/java/lang/Class.java
+++ b/classes/java/lang/Class.java
@@ -1,17 +1,17 @@
 package java.lang;
 
-public class Class {
+public final class Class<T> {
     private Object object;
     private String name;
 
     private Class() {
     }
 
-    private native String getClassName();
+    private native String _getName();
 
     public String getName() {
         if (this.name == null) {
-            this.name = getClassName();
+            this.name = _getName();
         }
         return this.name;
     }
diff --git a/classes/java/lang/Object.java b/classes/java/lang/Object.java
index 171178e..7f37027 100644
--- a/classes/java/lang/Object.java
+++ b/classes/java/lang/Object.java
@@ -3,11 +3,28 @@ package java.lang;
 public class Object {
     public Object() {}
 
-    public final native Class getClass();
+    protected Object clone()
+        throws CloneNotSupportedException {
+        throw new CloneNotSupportedException();
+    }
 
-    public native int hashCode();
+    public boolean equals(Object obj) {
+        return this == obj;
+    }
+
+    private final native Class<?> _getClass();
+
+    public final Class<?> getClass() {
+        return _getClass();
+    }
+
+    private native int _hashCode();
+
+    public int hashCode() {
+        return _hashCode();
+    }
 
     public String toString() {
-        return getClass().getName() + "@" + Integer.toString(hashCode());
+        return getClass().getName() + "@" + Integer.toHexString(hashCode());
     }
 }