@@ -0,0 +1,376 @@
+import java.util.HashMap;%0Aimport java.util.Map;%0A%0Apublic class Buggy %7B%0A%0A    public void run() %7B%0A        Map%3CString, Integer%3E map = new HashMap%3CString, Integer%3E();%0A%0A        map.put(%22one%22, new Integer(1));%0A%0A        for (String key: map.keySet()) %7B%0A            if (key == %22one%22) %7B%0A                System.out.print(%22content dump: %22 + map.get(key));%0A            %7D%0A        %7D%0A    %7D%0A%7D%0A

Add class with logical bug and performance concerns.