java - Get more than One value and display it -


i checking 'n' number of servers every minute, if servers down mail triggered user server name down. issue facing if more 1 server down getting 1 server name down. how name of servers down.

   obj = dataaccess.getservers();  //getting status , links of servers    mailserver sender = new mailserver(from,password);               list<string> downserver = new arraylist();    (map<string, string> objs : obj) { //iterating each server                 serverstatus = objs.get("status");                 if (serverstatus.equals("down")) {                     servername = objs.get("name");                     statusserver=objs.get("status");                 }    downserver.add(servername);   if(!(servername.equals(null))){         sender.sendmail("server status",downserver.get(i),from,to)    }

without checking reasonability of code or trying improve anything, code should little more following (at least) come close trying:

servers = dataaccess.getservers(); mailserver sender = new mailserver(from,password);  list<string> downservers = new arraylist(); (map<string, string> server : servers) {     serverstatus = server.get("status");     servername = server.get("name");     if (serverstatus.equals("down") && servername != null) {         downservers.add(servername);     } }  stringbuilder sb = new stringbuilder(); string sep = ""; (server : downservers) {     sb.append(sep).append(server);     sep = ", "; } sender.sendmail("server status", sb.tostring(), from, to);

or short 1 iteration:

mailserver sender = new mailserver(from,password); stringbuilder sb = new stringbuilder(); string sep = ""; (map<string, string> server : dataaccess.getservers()) {     string servername = server.get("name");     if (server.get("status").equals("down") && servername != null) {         sb.append(sep).append(servername);         sep = ", ";     } } sender.sendmail("server status", sb.tostring(), from, to);

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