src/share/classes/sun/tools/java/ClassDeclaration.java

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@@ -234,10 +234,15 @@
             return type.equals(((ClassDeclaration)obj).type);
         }
         return false;
     }
 
+    @Override
+    public int hashCode() {
+        return type.hashCode();
+    }
+
     /**
      * toString
      */
     public String toString() {
         String name = getName().toString();