sketch of serialization/deserialization code (broken)

classpath/java/util/IdentityHashMap.java

@@ -0,0 +1,65 @@
+package java.util;
+
+public class IdentityHashMap<K, V> implements Map<K, V> {
+  private final HashMap<K, V> map;
+
+  public IdentityHashMap(int capacity) {
+    map = new HashMap(capacity, new MyHelper());
+  }
+
+  public IdentityHashMap() {
+    this(0);
+  }
+
+  public int size() {
+    return map.size();
+  }
+
+  public boolean containsKey(K key) {
+    return map.containsKey(key);
+  }
+
+  public boolean containsValue(V value) {
+    return map.containsValue(value);
+  }
+
+  public V get(K key) {
+    return map.get(key);
+  }
+
+  public V put(K key, V value) {
+    return map.put(key, value);
+  }
+
+  public V remove(K key) {
+    return map.remove(key);
+  }
+
+  public void clear() {
+    map.clear();
+  }
+
+  public Set<Entry<K, V>> entrySet() {
+    return map.entrySet();
+  }
+
+  public Set<K> keySet() {
+    return map.keySet();
+  }
+
+  public Collection<V> values() {
+    return map.values();
+  }
+
+  private static class MyHelper<K, V>
+    extends HashMap.MyHelper<K, V>
+  {
+    public int hash(K a) {
+      return (a == null ? 0 : System.identityHashCode(a));
+    }
+
+    public boolean equal(K a, K b) {
+      return a == b;
+    }    
+  }
+}