diff --git a/classes.js b/classes.js
index 70599916..4fbd7d59 100644
--- a/classes.js
+++ b/classes.js
@@ -143,7 +143,30 @@ Classes.prototype.getStaticMethod = function(className, methodName, signature) {
 
 Classes.prototype.newObject = function(className) {
     // Force initialization of the class (if not already done).
-    this.getClass(className, true);
-
-    return {};
+    return { class: this.getClass(className, true) };
 }
+
+Classes.prototype.newArray = function(type, size) {
+    switch (type) {
+    case ARRAY_TYPE.T_BOOLEAN: return new Uint8Array(size);
+    case ARRAY_TYPE.T_CHAR: return new Uint16Array(size);
+    case ARRAY_TYPE.T_FLOAT: return new Float32Array(size);
+    case ARRAY_TYPE.T_DOUBLE: return new Float64Array(size);
+    case ARRAY_TYPE.T_BYTE: return new Int8Array(size);
+    case ARRAY_TYPE.T_SHORT: return new Int16Array(size);
+    case ARRAY_TYPE.T_INT: return new Int32Array(size);
+    case ARRAY_TYPE.T_LONG: return new Int64Array(size);
+    }
+}
+
+Classes.prototype.newString = function(s) {
+    var obj = this.newObject("java/lang/String");
+    var length = s.length;
+    var chars = this.newArray(ARRAY_TYPE.T_CHAR, length);
+    for (var n = 0; n < length; ++n)
+        chars[n] = s.charCodeAt(n);
+    obj.value = chars;
+    obj.offset = 0;
+    obj.count = length;
+    return obj;
+}
\ No newline at end of file
diff --git a/classfile/classarea.js b/classfile/classarea.js
index a55dcf8e..8e47690c 100644
--- a/classfile/classarea.js
+++ b/classfile/classarea.js
@@ -56,15 +56,12 @@ var getClassImage = function(classBytes) {
     var classImage = {};
         
     var getAttribues = function(attribute_name_index, bytes) {
-            
         var reader = new Reader(bytes);
         var attribute = { attribute_name_index: attribute_name_index };
     
-    
         var item = classImage.constant_pool[attribute_name_index];
         
         switch(item.tag) {
-        
             case TAGS.CONSTANT_Long:
             case TAGS.CONSTANT_Float:
             case TAGS.CONSTANT_Double:
@@ -74,11 +71,8 @@ var getClassImage = function(classBytes) {
                 attribute.constantvalue_index = reader.read16();
                 return attribute;        
             
-                
             case TAGS.CONSTANT_Utf8:
-                
                 switch(item.bytes) {
-                    
                     case ATTRIBUTE_TYPES.Code:
                         attribute.type = ATTRIBUTE_TYPES.Code;
                         attribute.max_stack = reader.read16();
diff --git a/frame.js b/frame.js
index ef58a3f4..d95f0513 100644
--- a/frame.js
+++ b/frame.js
@@ -232,7 +232,7 @@ Frame.prototype.ldc = function(done) {
     var constant = this._cp[this._read8()];
     switch(constant.tag) {
         case TAGS.CONSTANT_String:                        
-            this._stack.push(this._cp[constant.string_index].bytes);
+            this._stack.push(CLASSES.newString(this._cp[constant.string_index].bytes));
             break;
         default:
             throw new Error("not support constant type");
@@ -1163,7 +1163,7 @@ Frame.prototype.newarray = function(done) {
     if (size < 0) {
         return this._newException("java/lang/NegativeSizeException", done);
     }
-    this._stack.push(new Array(size));
+    this._stack.push(CLASSES.newArray(type, size));
     return done();    
 }
 
@@ -1684,7 +1684,7 @@ Frame.prototype.instanceof = function(done) {
     var idx = this._read16();
     var className = this._cp[this._cp[idx].name_index].bytes;
     var obj = this._stack.pop();
-    if (obj.getClassName() === className) {
+    if (obj.class.getClassName() === className) {
         this._stack.push(true);
     } else {
         this._stack.push(false);