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for (Iterator iter = OnlineClient.htOnlineClients.keySet().iterator();
         iter.hasNext(); ) {
      int item = Integer.parseInt(iter.next().toString());
      Online ol = (Online) OnlineClient.htOnlineClients.get(item);
      if (ol.getCompanyID() == companyID) {
        reOnline = ol;
        break;
      }
    }

上面htOnlineClients的键是int类型的。如上正确,但如下，转换成String却出错。

for (Iterator iter = OnlineClient.htOnlineClients.keySet().iterator();
         iter.hasNext(); ) {
      String item = (String)iter.next();
      Online ol = (Online) OnlineClient.htOnlineClients.get(item);
      if (ol.getCompanyID() == companyID) {
        reOnline = ol;
        break;
      }
    }