diff --git a/composer.json b/composer.json
index f2515c7f..d8e51e77 100644
--- a/composer.json
+++ b/composer.json
@@ -3,7 +3,7 @@
     "description": "JVM emulator by PHP",
     "type": "library",
     "license": "MIT",
-    "version": "0.0.7.0-dev",
+    "version": "0.0.7.1-dev",
     "authors": [
         {
             "name": "memory"
diff --git a/src/Core/JVM/AttributePool.php b/src/Core/JVM/AttributePool.php
index 475aee11..4e8316bc 100644
--- a/src/Core/JVM/AttributePool.php
+++ b/src/Core/JVM/AttributePool.php
@@ -6,7 +6,7 @@
 use PHPJava\Kernel\Attributes\AttributeInfo;
 use PHPJava\Utilities\DebugTool;
 
-class AttributePool implements \ArrayAccess, \Countable
+class AttributePool implements \ArrayAccess, \Countable, \IteratorAggregate
 {
     private $entries = [];
     private $reader;
@@ -58,4 +58,9 @@ public function offsetUnset($offset)
     {
         throw new ReadOnlyException('You cannot rewrite datum. The Attribute Pool is read-only.');
     }
+
+    public function getIterator()
+    {
+        return new \ArrayIterator($this->entries);
+    }
 }
diff --git a/src/Core/JVM/ConstantPool.php b/src/Core/JVM/ConstantPool.php
index 62fa6478..69a4cef2 100644
--- a/src/Core/JVM/ConstantPool.php
+++ b/src/Core/JVM/ConstantPool.php
@@ -20,7 +20,7 @@
 use PHPJava\Kernel\Structures\_Utf8;
 use PHPJava\Kernel\Structures\StructureInterface;
 
-class ConstantPool implements \ArrayAccess, \Countable
+class ConstantPool implements \ArrayAccess, \Countable, \IteratorAggregate
 {
     private $entries = [];
     private $reader;
@@ -116,4 +116,9 @@ public function offsetUnset($offset)
     {
         throw new ReadOnlyException('You cannot rewrite datum. The Constant Pool is read-only.');
     }
+
+    public function getIterator()
+    {
+        return new \ArrayIterator($this->entries);
+    }
 }
diff --git a/src/Core/JVM/FieldPool.php b/src/Core/JVM/FieldPool.php
index 7d09a121..94a75d37 100644
--- a/src/Core/JVM/FieldPool.php
+++ b/src/Core/JVM/FieldPool.php
@@ -7,7 +7,7 @@
 use PHPJava\Kernel\Structures\_FieldInfo;
 use PHPJava\Utilities\DebugTool;
 
-class FieldPool implements \ArrayAccess, \Countable
+class FieldPool implements \ArrayAccess, \Countable, \IteratorAggregate
 {
     private $entries = [];
     private $reader;
@@ -56,4 +56,9 @@ public function offsetUnset($offset)
     {
         throw new ReadOnlyException('You cannot rewrite datum. The Field Pool is read-only.');
     }
+
+    public function getIterator()
+    {
+        return new \ArrayIterator($this->entries);
+    }
 }
diff --git a/src/Core/JVM/InterfacePool.php b/src/Core/JVM/InterfacePool.php
index 87757024..a2a66ca0 100644
--- a/src/Core/JVM/InterfacePool.php
+++ b/src/Core/JVM/InterfacePool.php
@@ -6,7 +6,7 @@
 use PHPJava\Exceptions\ReadOnlyException;
 use PHPJava\Utilities\DebugTool;
 
-class InterfacePool implements \ArrayAccess, \Countable
+class InterfacePool implements \ArrayAccess, \Countable, \IteratorAggregate
 {
     private $entries = [];
     private $reader;
@@ -52,4 +52,9 @@ public function offsetUnset($offset)
     {
         throw new ReadOnlyException('You cannot rewrite datum. The Interface Pool is read-only.');
     }
+
+    public function getIterator()
+    {
+        return new \ArrayIterator($this->entries);
+    }
 }
diff --git a/src/Core/JVM/MethodPool.php b/src/Core/JVM/MethodPool.php
index 790ae25d..dc874542 100644
--- a/src/Core/JVM/MethodPool.php
+++ b/src/Core/JVM/MethodPool.php
@@ -6,7 +6,7 @@
 use PHPJava\Kernel\Structures\_MethodInfo;
 use PHPJava\Utilities\DebugTool;
 
-class MethodPool implements \ArrayAccess, \Countable
+class MethodPool implements \ArrayAccess, \Countable, \IteratorAggregate
 {
     private $entries = [];
     private $reader;
@@ -55,4 +55,9 @@ public function offsetUnset($offset)
     {
         throw new ReadOnlyException('You cannot rewrite datum. The Interface Pool is read-only.');
     }
+
+    public function getIterator()
+    {
+        return new \ArrayIterator($this->entries);
+    }
 }
diff --git a/src/Core/JavaClass.php b/src/Core/JavaClass.php
index cc8f6ab0..c4c117c8 100644
--- a/src/Core/JavaClass.php
+++ b/src/Core/JavaClass.php
@@ -14,6 +14,7 @@
 use PHPJava\Exceptions\ValidatorException;
 use PHPJava\Kernel\Attributes\AttributeInterface;
 use PHPJava\Kernel\Attributes\InnerClassesAttribute;
+use PHPJava\Kernel\Attributes\SourceFileAttribute;
 use PHPJava\Kernel\Maps\FieldAccessFlag;
 use PHPJava\Kernel\Structures\_Utf8;
 use PHPJava\Utilities\ClassResolver;
@@ -248,11 +249,22 @@ public function __destruct()
 
     public function getClassName(bool $shortName = false): string
     {
+        $className = $this->className->getString();
         if ($shortName === true) {
-            $split = explode('$', $this->className->getString());
+            $split = explode('$', $className);
             return $split[count($split) - 1];
         }
-        return $this->className->getString();
+        return $className;
+    }
+
+
+    public function getPackageName(): ?string
+    {
+        $className = dirname($this->className->getString());
+        if ($className === '') {
+            return null;
+        }
+        return str_replace('/', '.', $className);
     }
 
     public function getInnerClasses(): array
diff --git a/src/Core/PHPJava.php b/src/Core/PHPJava.php
index 8bc91468..3b63ca73 100644
--- a/src/Core/PHPJava.php
+++ b/src/Core/PHPJava.php
@@ -12,5 +12,5 @@ final class PHPJava
     /**
      * As same as composer version.
      */
-    const VERSION = 0x000070;
+    const VERSION = 0x000071;
 }