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diff --git a/src/cuchaz/enigma/convert/ClassMapper.java b/src/cuchaz/enigma/convert/ClassMapper.java
new file mode 100644
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+++ b/src/cuchaz/enigma/convert/ClassMapper.java
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+/*******************************************************************************
+ * Copyright (c) 2014 Jeff Martin.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the GNU Public License v3.0
+ * which accompanies this distribution, and is available at
+ * http://www.gnu.org/licenses/gpl.html
+ * 
+ * Contributors:
+ *     Jeff Martin - initial API and implementation
+ ******************************************************************************/
+package cuchaz.enigma.convert;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.jar.JarFile;
+
+import javassist.CtClass;
+
+import com.google.common.collect.HashMultiset;
+import com.google.common.collect.Multiset;
+
+import cuchaz.enigma.analysis.JarClassIterator;
+
+public class ClassMapper
+{
+        public static void main( String[] args )
+        throws IOException
+        {
+                // TEMP
+                JarFile fromJar = new JarFile( new File( "input/1.8-pre1.jar" ) );
+                JarFile toJar = new JarFile( new File( "input/1.8-pre2.jar" ) );
+                
+                new ClassMapper( fromJar, toJar );
+        }
+        
+        public ClassMapper( JarFile a, JarFile b )
+        {
+                int numAClasses = JarClassIterator.getClassEntries( a ).size();
+                int numBClasses = JarClassIterator.getClassEntries( b ).size();
+                
+                // TEMP
+                System.out.println( "A classes: " + numAClasses );
+                System.out.println( "B classes: " + numBClasses );
+                
+                // compute the a classes
+                Multiset<ClassIdentity> aclasses = HashMultiset.create();
+                for( CtClass c : JarClassIterator.classes( a ) )
+                {
+                        ClassIdentity aclass = new ClassIdentity( c );
+                        aclasses.add( aclass );
+                }
+                
+                int numMatches = 0;
+                
+                // match the b classes to the a classes
+                for( CtClass c : JarClassIterator.classes( b ) )
+                {
+                        ClassIdentity bclass = new ClassIdentity( c );
+                        if( aclasses.contains( bclass ) )
+                        {
+                                numMatches++;
+                        }
+                        
+                        // TEMP
+                        //System.out.println( bclass );
+                }
+                
+                // TEMP
+                System.out.println( String.format( "Class matches: %d/%d (missing %d)",
+                        numMatches, aclasses.size(), aclasses.size() - numMatches
+                ) );
+        }
+}